Changeset 2267 for Tutorials/StackingFaults-II/Stacking Faults II.htm
- Timestamp:
- May 13, 2016 3:51:35 PM (7 years ago)
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Tutorials/StackingFaults-II/Stacking Faults II.htm
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<![endif]--><!--[if gte mso 9]><xml> 1089 <o:shapedefaults v:ext="edit" spidmax="1029"/> 1090 </xml><![endif]--><!--[if gte mso 9]><xml> 1091 <o:shapelayout v:ext="edit"> 1092 <o:idmap v:ext="edit" data="1"/> 1093 <o:rules v:ext="edit"> 1094 <o:r id="V:Rule1" type="connector" idref="#Straight_x0020_Arrow_x0020_Connector_x0020_32"/> 1095 </o:rules> 1096 </o:shapelayout></xml><![endif]--> 215 1097 216 </head> 1098 217 1099 <body lang=EN-US link=blue vlink=purple style='tab-interval:.5in'>218 <body lang=EN-US link=blue vlink=purple> 1100 219 1101 220 <div class=WordSection1> 1102 221 1103 <h1><span style='mso-fareast-font-family:"Times New Roman"'>Stacking Fault 1104 Simulations II<o:p></o:p></span></h1> 222 <h1>Stacking Fault Simulations II</h1> 1105 223 1106 224 <p class=MsoNormal>In this exercise you will simulate some diffraction patterns 1107 from kaolinite clays. Kaolinite, <span class=GramE>Al<sub>2</sub>Si<sub>2</sub>O<sub>5</sub>(</span>OH)<sub>4</sub>, 1108 is a 1:1 layer silicate with a single unique sheet with AlO<sub>6</sub> <span 1109 class=SpellE>octahedra</span> on one side and SiO<sub>4</sub> <span 1110 class=SpellE>tetrahedra</span> on the other. The layers stack with an offset to 1111 ideally form a triclinic C1 lattice (<span class=SpellE>Bish</span> & Von 225 from kaolinite clays. Kaolinite, Al<sub>2</sub>Si<sub>2</sub>O<sub>5</sub>(OH)<sub>4</sub>, 226 is a 1:1 layer silicate with a single unique sheet with AlO<sub>6</sub> 227 octahedra on one side and SiO<sub>4</sub> tetrahedra on the other. The layers 228 stack with an offset to ideally form a triclinic C1 lattice (Bish & Von 1112 229 Dreele, 1989, Clay & Clay Min. 37, 289-296) for a sample of the most 1113 230 ordered form of kaolinite from Keokuk, Iowa. Kaolinites from other locations … … 1116 233 laboratory Bragg-Brentano pattern of Keokuk kaolinite and a less ordered one 1117 234 from Washington County, Georgia (Clay Minerals Society Standard KGa-1b) 1118 collected with <span class=SpellE>CuKa</span> radiation on a Bruker instrument 1119 and thus in the Bruker RAW file format. The KGa-1b sample contains a small 1120 amount of <span class=SpellE>anatase</span> (TiO<sub>2</sub>) and the Keokuk 1121 kaolinite has some <span class=SpellE>dickite</span> (different ordered 1122 stacking of kaolinite layers).</p> 235 collected with CuKa radiation on a Bruker instrument and thus in the Bruker RAW 236 file format. The KGa-1b sample contains a small amount of anatase (TiO<sub>2</sub>) 237 and the Keokuk kaolinite has some dickite (different ordered stacking of 238 kaolinite layers).</p> 1123 239 1124 240 <p class=MsoNormal>If you have not done so already, start GSAS-II.</p> 1125 241 1126 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Part 1. Creating 1127 kaolinite layer<o:p></o:p></span></h2> 1128 1129 <p class=MsoNormal>In this initial step we will load from a <span class=SpellE>cif</span> 1130 file the structure of kaolinite, draw it to see the layer structure and then 1131 transform it into forms suitable for stacking simulations. To begin do <b><span 242 <h2>Part 1. Creating kaolinite layer</h2> 243 244 <p class=MsoNormal>In this initial step we will load from a cif file the 245 structure of kaolinite, draw it to see the layer structure and then transform 246 it into forms suitable for stacking simulations. To begin do <b><span 1132 247 style='font-family:"Calibri",sans-serif'>Import/Phase/from CIF file</span></b>; 1133 from the file dialog select <span class=SpellE><b><span style='font-family: 1134 "Calibri",sans-serif'>kaolinite.cif</span></b></span>. After the are you sure 1135 popup, there will be another warning you that 4 atom types (O-H) were not 1136 recognized chemical element symbols and they were substituted by <span 1137 class=SpellE>Xe</span> to make them obvious in the atom list. Press <b><span 248 from the file dialog select <b><span style='font-family:"Calibri",sans-serif'>kaolinite.cif</span></b>. 249 After the are you sure popup, there will be another warning you that 4 atom 250 types (O-H) were not recognized chemical element symbols and they were 251 substituted by Xe to make them obvious in the atom list. Press <b><span 1138 252 style='font-family:"Calibri",sans-serif'>Ok</span></b>; you are offered a 1139 253 chance to change the phase name, I used <b><span style='font-family:"Calibri",sans-serif'>kaolinite</span></b>. 1140 The General tab is displayed (notice the presence of <span class=SpellE>Xe</span> 1141 in the element table).</p> 1142 1143 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shapetype 1144 id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" 1145 path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"> 1146 <v:stroke joinstyle="miter"/> 1147 <v:formulas> 1148 <v:f eqn="if lineDrawn pixelLineWidth 0"/> 1149 <v:f eqn="sum @0 1 0"/> 1150 <v:f eqn="sum 0 0 @1"/> 1151 <v:f eqn="prod @2 1 2"/> 1152 <v:f eqn="prod @3 21600 pixelWidth"/> 1153 <v:f eqn="prod @3 21600 pixelHeight"/> 1154 <v:f eqn="sum @0 0 1"/> 1155 <v:f eqn="prod @6 1 2"/> 1156 <v:f eqn="prod @7 21600 pixelWidth"/> 1157 <v:f eqn="sum @8 21600 0"/> 1158 <v:f eqn="prod @7 21600 pixelHeight"/> 1159 <v:f eqn="sum @10 21600 0"/> 1160 </v:formulas> 1161 <v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/> 1162 <o:lock v:ext="edit" aspectratio="t"/> 1163 </v:shapetype><v:shape id="Picture_x0020_8" o:spid="_x0000_i1043" type="#_x0000_t75" 1164 style='width:697.5pt;height:375pt;visibility:visible;mso-wrap-style:square'> 1165 <v:imagedata src="Stacking%20Faults%20II_files/image001.png" o:title=""/> 1166 </v:shape><![endif]--><![if !vml]><img width=930 height=500 1167 src="Stacking%20Faults%20II_files/image002.gif" v:shapes="Picture_x0020_8"><![endif]></span></p> 1168 1169 <p class=MsoNormal>To fix the <span class=SpellE>Xe</span> atoms (they should be 1170 O), select <b><span style='font-family:"Calibri",sans-serif'>Atoms</span></b> 1171 and then double click the <b><span style='font-family:"Calibri",sans-serif'>Type</span></b> 1172 column heading; a small popup will appear. Select <span class=SpellE><b><span 1173 style='font-family:"Calibri",sans-serif'>Xe</span></b></span> & press <b><span 1174 style='font-family:"Calibri",sans-serif'>Ok</span></b>; the <span class=SpellE>Xe</span> 1175 atoms at the bottom of the atom table will be highlighted. Next select <b><span 254 The General tab is displayed (notice the presence of Xe in the element table).</p> 255 256 <p class=MsoNormal><img width=930 height=500 id="Picture 8" 257 src="Stacking%20Faults%20II_files/image001.gif"></p> 258 259 <p class=MsoNormal>To fix the Xe atoms (they should be O), select <b><span 260 style='font-family:"Calibri",sans-serif'>Atoms</span></b> and then double click 261 the <b><span style='font-family:"Calibri",sans-serif'>Type</span></b> column 262 heading; a small popup will appear. Select <b><span style='font-family:"Calibri",sans-serif'>Xe</span></b> 263 & press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>; 264 the Xe atoms at the bottom of the atom table will be highlighted. Next select <b><span 1176 265 style='font-family:"Calibri",sans-serif'>Edit/Modify atom parameters</span></b> 1177 266 from the Phase Data menu; a new popup will appear.</p> 1178 267 1179 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1180 id="Picture_x0020_9" o:spid="_x0000_i1042" type="#_x0000_t75" style='width:171pt; 1181 height:201pt;visibility:visible;mso-wrap-style:square'> 1182 <v:imagedata src="Stacking%20Faults%20II_files/image003.png" o:title=""/> 1183 </v:shape><![endif]--><![if !vml]><img width=228 height=268 1184 src="Stacking%20Faults%20II_files/image004.gif" v:shapes="Picture_x0020_9"><![endif]></span></p> 268 <p class=MsoNormal><img width=228 height=268 id="Picture 9" 269 src="Stacking%20Faults%20II_files/image002.gif"></p> 1185 270 1186 271 <p class=MsoNormal>Select <b><span style='font-family:"Calibri",sans-serif'>Type</span></b> … … 1190 275 be drawn with Al, Si & O atoms only.</p> 1191 276 1192 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1193 id="Picture_x0020_10" o:spid="_x0000_i1041" type="#_x0000_t75" style='width:359.25pt; 1194 height:268.5pt;visibility:visible;mso-wrap-style:square'> 1195 <v:imagedata src="Stacking%20Faults%20II_files/image005.jpg" o:title=""/> 1196 </v:shape><![endif]--><![if !vml]><img width=479 height=358 1197 src="Stacking%20Faults%20II_files/image006.jpg" v:shapes="Picture_x0020_10"><![endif]></span></p> 277 <p class=MsoNormal><img width=479 height=358 id="Picture 10" 278 src="Stacking%20Faults%20II_files/image003.jpg"></p> 1198 279 1199 280 <p class=MsoNormal>To better visualize the stacking layer, select the <b><span … … 1209 290 layering along the c-axis (blue line) will be evident.</p> 1210 291 1211 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1212 id="Picture_x0020_11" o:spid="_x0000_i1040" type="#_x0000_t75" style='width:5in; 1213 height:269.25pt;visibility:visible;mso-wrap-style:square'> 1214 <v:imagedata src="Stacking%20Faults%20II_files/image007.jpg" o:title=""/> 1215 </v:shape><![endif]--><![if !vml]><img width=480 height=359 1216 src="Stacking%20Faults%20II_files/image008.jpg" v:shapes="Picture_x0020_11"><![endif]></span></p> 1217 1218 <p class=MsoNormal>One can easily see the layer of SiO<sub>4</sub> <span 1219 class=SpellE>tetrahedra</span> and AlO<sub>6</sub> <span class=SpellE>octahedra</span>. 1220 Also notice that the next layer (represented by the 4 O atoms at the bottom of 1221 the above drawing are offset giving a triclinic lattice.</p> 1222 1223 <p class=MsoNormal>The stacking fault simulation calculation via <span 1224 class=SpellE>DIFFaX</span> routines requires that the stacking layers be 1225 defined in a coordinate system that has the stacking direction perpendicular to 1226 the stacking plane defined as the c-axis. This requires transformation of the 1227 unit cell and atom coordinates; a suitable tool exists in GSAS-II to do this. 1228 Select the <b><span style='font-family:"Calibri",sans-serif'>General</span></b> 1229 tab and do <b><span style='font-family:"Calibri",sans-serif'>Compute/Transform</span></b>; 1230 a popup window will appear.</p> 1231 1232 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1233 id="Picture_x0020_12" o:spid="_x0000_i1039" type="#_x0000_t75" style='width:262.5pt; 1234 height:254.25pt;visibility:visible;mso-wrap-style:square'> 1235 <v:imagedata src="Stacking%20Faults%20II_files/image009.png" o:title=""/> 1236 </v:shape><![endif]--><![if !vml]><img width=350 height=339 1237 src="Stacking%20Faults%20II_files/image010.gif" v:shapes="Picture_x0020_12"><![endif]></span></p> 292 <p class=MsoNormal><img width=480 height=359 id="Picture 11" 293 src="Stacking%20Faults%20II_files/image004.jpg"></p> 294 295 <p class=MsoNormal>One can easily see the layer of SiO<sub>4</sub> tetrahedra 296 and AlO<sub>6</sub> octahedra. Also notice that the next layer (represented by 297 the 4 O atoms at the bottom of the above drawing are offset giving a triclinic 298 lattice.</p> 299 300 <p class=MsoNormal>The stacking fault simulation calculation via DIFFaX 301 routines requires that the stacking layers be defined in a coordinate system 302 that has the stacking direction perpendicular to the stacking plane defined as 303 the c-axis. This requires transformation of the unit cell and atom coordinates; 304 a suitable tool exists in GSAS-II to do this. Select the <b><span 305 style='font-family:"Calibri",sans-serif'>General</span></b> tab and do <b><span 306 style='font-family:"Calibri",sans-serif'>Compute/Transform</span></b>; a popup 307 window will appear.</p> 308 309 <p class=MsoNormal><img width=350 height=339 id="Picture 12" 310 src="Stacking%20Faults%20II_files/image005.gif"></p> 1238 311 1239 312 <p class=MsoNormal>Note that this allows one to transform the structure … … 1241 314 and then select those that are unique according to a selected space group. The 1242 315 pulldown gives a selection of commonly used transformations; we want the last 1243 one, <span class=SpellE><span class=GramE><b><span style='font-family:"Calibri",sans-serif'>abc</span></b></span></span><b><span 1244 style='font-family:"Calibri",sans-serif'>*</span></b>, which satisfies the 1245 stacking fault requirement. Select it; notice that the space group is changed 1246 to P1. Leave this as the kaolinite layer has no symmetry; in other 1247 circumstances the layer may have an inversion center in which P-1 should be 1248 used. If you press <b><span style='font-family:"Calibri",sans-serif'>Test</span></b>, 316 one, <b><span style='font-family:"Calibri",sans-serif'>abc*</span></b>, which 317 satisfies the stacking fault requirement. Select it; notice that the space 318 group is changed to P1. Leave this as the kaolinite layer has no symmetry; in 319 other circumstances the layer may have an inversion center in which P-1 should 320 be used. If you press <b><span style='font-family:"Calibri",sans-serif'>Test</span></b>, 1249 321 the new lattice parameters will be shown.</p> 1250 322 1251 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1252 id="Picture_x0020_13" o:spid="_x0000_i1038" type="#_x0000_t75" style='width:262.5pt; 1253 height:254.25pt;visibility:visible;mso-wrap-style:square'> 1254 <v:imagedata src="Stacking%20Faults%20II_files/image011.png" o:title=""/> 1255 </v:shape><![endif]--><![if !vml]><img width=350 height=339 1256 src="Stacking%20Faults%20II_files/image012.gif" v:shapes="Picture_x0020_13"><![endif]></span></p> 1257 1258 <p class=MsoNormal><span class=GramE>The a</span> & b axes stay the same, 1259 but c is now smaller (the interlayer distance in kaolinite) and <span 1260 style='font-family:Symbol'>a</span> & <span style='font-family:Symbol'>b</span> 1261 = 90 (<span style='font-family:Symbol'>g</span> is unchanged). Press <b><span 1262 style='font-family:"Calibri",sans-serif'>Ok</span></b>; a new phase (kaolinite <span 1263 class=SpellE><span class=GramE>abc</span></span>*) will be made and its General 1264 tab will be shown immediately. Select the <b><span style='font-family:"Calibri",sans-serif'>Draw 323 <p class=MsoNormal><img width=350 height=339 id="Picture 13" 324 src="Stacking%20Faults%20II_files/image006.gif"></p> 325 326 <p class=MsoNormal>The a & b axes stay the same, but c is now smaller (the 327 interlayer distance in kaolinite) and <span style='font-family:Symbol'>a</span> 328 & <span style='font-family:Symbol'>b</span> = 90 (<span style='font-family: 329 Symbol'>g</span> is unchanged). Press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>; 330 a new phase (kaolinite abc*) will be made and its General tab will be shown 331 immediately. Select the <b><span style='font-family:"Calibri",sans-serif'>Draw 1265 332 Atoms</span></b> tab to see the resulting structure.</p> 1266 333 1267 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1268 id="Picture_x0020_14" o:spid="_x0000_i1037" type="#_x0000_t75" style='width:353.25pt; 1269 height:264pt;visibility:visible;mso-wrap-style:square'> 1270 <v:imagedata src="Stacking%20Faults%20II_files/image013.jpg" o:title=""/> 1271 </v:shape><![endif]--><![if !vml]><img width=471 height=352 1272 src="Stacking%20Faults%20II_files/image014.jpg" v:shapes="Picture_x0020_14"><![endif]></span></p> 334 <p class=MsoNormal><img width=471 height=352 id="Picture 14" 335 src="Stacking%20Faults%20II_files/image007.jpg"></p> 1273 336 1274 337 <p class=MsoNormal>To see what this layer looks like with more of it drawn, you 1275 338 can add more unit cells to the drawing; select all the atoms by double clicking 1276 the upper left empty box of the Draw atoms table. Do <b style='mso-bidi-font-weight: 1277 normal'><span style='font-family:"Calibri",sans-serif;mso-ascii-theme-font: 1278 minor-latin;mso-hansi-theme-font:minor-latin'>Edit/Add atoms</span></b> and <b 1279 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1280 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>increment</span></b> 1281 the 1<sup>st</sup> <b style='mso-bidi-font-weight:normal'><span 1282 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1283 mso-hansi-theme-font:minor-latin'>Choose unit cel</span></b>l and press <b 1284 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1285 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Ok</span></b>; 1286 this will add one unit cell along x. Now select all the atoms again, do <b 1287 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1288 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Edit/Add 1289 atoms</span></b> and now <b style='mso-bidi-font-weight:normal'><span 1290 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1291 mso-hansi-theme-font:minor-latin'>decrement</span></b> the 1<sup>st</sup> <b 1292 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1293 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Choose unit 1294 cell</span></b>. Press <b style='mso-bidi-font-weight:normal'><span 1295 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1296 mso-hansi-theme-font:minor-latin'>Ok</span></b>; the drawing will now be 3 unit 1297 cells wide along x. Repeat this once more <b style='mso-bidi-font-weight:normal'><span 1298 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1299 mso-hansi-theme-font:minor-latin'>decrementing</span></b> the 2<sup>nd</sup> <b 1300 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1301 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Choose unit 1302 cell</span></b> to give a 3x2 unit cell block of atoms. Double click the <b 1303 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1304 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Style</span></b> 1305 column heading and select <b style='mso-bidi-font-weight:normal'><span 1306 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1307 mso-hansi-theme-font:minor-latin'>Balls and sticks</span></b>; the drawing 1308 should look like (after some zooming/shifting/rotation).</p> 1309 1310 <p class=MsoNormal><!--[if gte vml 1]><v:line id="Straight_x0020_Connector_x0020_16" 1311 o:spid="_x0000_s1028" style='position:absolute;z-index:251659264;visibility:visible; 1312 mso-wrap-style:square;mso-width-percent:0;mso-height-percent:0; 1313 mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;mso-wrap-distance-right:9pt; 1314 mso-wrap-distance-bottom:0;mso-position-horizontal:absolute; 1315 mso-position-horizontal-relative:text;mso-position-vertical:absolute; 1316 mso-position-vertical-relative:text;mso-width-percent:0;mso-height-percent:0; 1317 mso-width-relative:page;mso-height-relative:page' from="9.75pt,78.7pt" to="275.25pt,227.95pt" 1318 o:gfxdata="UEsDBBQABgAIAAAAIQC2gziS/gAAAOEBAAATAAAAW0NvbnRlbnRfVHlwZXNdLnhtbJSRQU7DMBBF 1319 90jcwfIWJU67QAgl6YK0S0CoHGBkTxKLZGx5TGhvj5O2G0SRWNoz/78nu9wcxkFMGNg6quQqL6RA 1320 0s5Y6ir5vt9lD1JwBDIwOMJKHpHlpr69KfdHjyxSmriSfYz+USnWPY7AufNIadK6MEJMx9ApD/oD 1321 OlTrorhX2lFEilmcO2RdNtjC5xDF9pCuTyYBB5bi6bQ4syoJ3g9WQ0ymaiLzg5KdCXlKLjvcW893 1322 SUOqXwnz5DrgnHtJTxOsQfEKIT7DmDSUCaxw7Rqn8787ZsmRM9e2VmPeBN4uqYvTtW7jvijg9N/y 1323 JsXecLq0q+WD6m8AAAD//wMAUEsDBBQABgAIAAAAIQA4/SH/1gAAAJQBAAALAAAAX3JlbHMvLnJl 1324 bHOkkMFqwzAMhu+DvYPRfXGawxijTi+j0GvpHsDYimMaW0Yy2fr2M4PBMnrbUb/Q94l/f/hMi1qR 1325 JVI2sOt6UJgd+ZiDgffL8ekFlFSbvV0oo4EbChzGx4f9GRdb25HMsYhqlCwG5lrLq9biZkxWOiqY 1326 22YiTra2kYMu1l1tQD30/bPm3wwYN0x18gb45AdQl1tp5j/sFB2T0FQ7R0nTNEV3j6o9feQzro1i 1327 OWA14Fm+Q8a1a8+Bvu/d/dMb2JY5uiPbhG/ktn4cqGU/er3pcvwCAAD//wMAUEsDBBQABgAIAAAA 1328 IQAHYEc53gEAAA4EAAAOAAAAZHJzL2Uyb0RvYy54bWysU8tu2zAQvBfoPxC817KUOnEEyznYaC9B 1329 a9TtBzDUUiLKF0jWkv++S8pW0gcQoOiFILk7s7PD5eZh1IqcwAdpTUPLxZISMNy20nQN/fb1w7s1 1330 JSEy0zJlDTT0DIE+bN++2Qyuhsr2VrXgCZKYUA+uoX2Mri6KwHvQLCysA4NBYb1mEY++K1rPBmTX 1331 qqiWy9tisL513nIIAW/3U5BuM78QwONnIQJEohqK2mJefV6f0lpsN6zuPHO95BcZ7B9UaCYNFp2p 1332 9iwy8sPLP6i05N4GK+KCW11YISSH3AN2Uy5/6+bYMwe5FzQnuNmm8P9o+afTwRPZNrRCewzT+EbH 1333 6Jns+kh21hh00HpS3ianBhdqBOzMwade+WiO7tHy7wFjxS/BdAhuShuF1ykdmyVjdv48Ow9jJBwv 1334 b27uyvUKFXCMlev71fu7VapYsPoKdz7Ej2A1SZuGKmmSNaxmp8cQp9RrSrpWJq3pZs9CT04MB0B1 1335 aX/hTQlZ9KQzK45nBRP4Cwh0JSnLRfI8wk75iYhxDiZWMxNmJ5iQSs3A5evAS36CQp7VGVy9Dp4R 1336 ubI1cQZraaz/G0Ecy4tkMeVfHZj6ThY82fZ88Nf3xKHLb3D5IGmqX54z/Pkbb38CAAD//wMAUEsD 1337 BBQABgAIAAAAIQD5Ahr24AAAAAoBAAAPAAAAZHJzL2Rvd25yZXYueG1sTI/RSsNAEEXfBf9hGcEX 1338 sRtL15qYTRFBSwsi1n7AJjtNgtnZkN2k8e8dn/RpuDOXO+fmm9l1YsIhtJ403C0SEEiVty3VGo6f 1339 L7cPIEI0ZE3nCTV8Y4BNcXmRm8z6M33gdIi14BAKmdHQxNhnUoaqQWfCwvdIfDv5wZnIcqilHcyZ 1340 w10nl0lyL51piT80psfnBquvw+g0vG73bplOu9NRte+0fRvL9ma31vr6an56BBFxjn9m+MVndCiY 1341 qfQj2SA61qliJ0+1XoFgg1IJb0oNK6VSkEUu/1cofgAAAP//AwBQSwECLQAUAAYACAAAACEAtoM4 1342 kv4AAADhAQAAEwAAAAAAAAAAAAAAAAAAAAAAW0NvbnRlbnRfVHlwZXNdLnhtbFBLAQItABQABgAI 1343 AAAAIQA4/SH/1gAAAJQBAAALAAAAAAAAAAAAAAAAAC8BAABfcmVscy8ucmVsc1BLAQItABQABgAI 1344 AAAAIQAHYEc53gEAAA4EAAAOAAAAAAAAAAAAAAAAAC4CAABkcnMvZTJvRG9jLnhtbFBLAQItABQA 1345 BgAIAAAAIQD5Ahr24AAAAAoBAAAPAAAAAAAAAAAAAAAAADgEAABkcnMvZG93bnJldi54bWxQSwUG 1346 AAAAAAQABADzAAAARQUAAAAA 1347 " strokecolor="#ed7d31 [3205]" strokeweight="1.5pt"> 1348 <v:stroke dashstyle="longDash" joinstyle="miter"/> 1349 <o:lock v:ext="edit" shapetype="f"/> 1350 </v:line><![endif]--><![if !vml]><span style='mso-ignore:vglayout;position: 1351 absolute;z-index:251659264;margin-left:12px;margin-top:103px;width:356px; 1352 height:202px'><img width=356 height=202 1353 src="Stacking%20Faults%20II_files/image015.gif" v:shapes="Straight_x0020_Connector_x0020_16"></span><![endif]><span 1354 style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_15" 1355 o:spid="_x0000_i1036" type="#_x0000_t75" style='width:357.75pt;height:267.75pt; 1356 visibility:visible;mso-wrap-style:square'> 1357 <v:imagedata src="Stacking%20Faults%20II_files/image016.jpg" o:title=""/> 1358 </v:shape><![endif]--><![if !vml]><img width=477 height=357 1359 src="Stacking%20Faults%20II_files/image017.jpg" v:shapes="Picture_x0020_15"><![endif]></span></p> 339 the upper left empty box of the Draw atoms table. Do <b><span style='font-family: 340 "Calibri",sans-serif'>Edit/Add atoms</span></b> and <b><span style='font-family: 341 "Calibri",sans-serif'>increment</span></b> the 1<sup>st</sup> <b><span 342 style='font-family:"Calibri",sans-serif'>Choose unit cel</span></b>l and press <b><span 343 style='font-family:"Calibri",sans-serif'>Ok</span></b>; this will add one unit 344 cell along x. Now select all the atoms again, do <b><span style='font-family: 345 "Calibri",sans-serif'>Edit/Add atoms</span></b> and now <b><span 346 style='font-family:"Calibri",sans-serif'>decrement</span></b> the 1<sup>st</sup> 347 <b><span style='font-family:"Calibri",sans-serif'>Choose unit cell</span></b>. 348 Press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>; the 349 drawing will now be 3 unit cells wide along x. Repeat this once more <b><span 350 style='font-family:"Calibri",sans-serif'>decrementing</span></b> the 2<sup>nd</sup> 351 <b><span style='font-family:"Calibri",sans-serif'>Choose unit cell</span></b> 352 to give a 3x2 unit cell block of atoms. Double click the <b><span 353 style='font-family:"Calibri",sans-serif'>Style</span></b> column heading and 354 select <b><span style='font-family:"Calibri",sans-serif'>Balls and sticks</span></b>; 355 the drawing should look like (after some zooming/shifting/rotation).</p> 356 357 <p class=MsoNormal><span style='position:absolute;z-index:251659264;margin-left: 358 12px;margin-top:104px;width:356px;height:201px'><img width=356 height=201 359 src="Stacking%20Faults%20II_files/image008.gif"></span><img width=477 360 height=357 id="Picture 15" src="Stacking%20Faults%20II_files/image009.jpg"></p> 1360 361 1361 362 <p class=MsoNormal>Ill say more about that diagonal line later. This structure 1362 is now suitable for use in <span class=SpellE>DIFFaX</span> calculations; the 1363 cell has a c-axis that is perpendicular to the ab plane with a length that is 1364 the stacking repeat distance. This is a good place to save your project (I 1365 called it <b style='mso-bidi-font-weight:normal'><span style='font-family: 1366 "Calibri",sans-serif;mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1367 minor-latin'>kaolinite</span></b>).</p> 363 is now suitable for use in DIFFaX calculations; the cell has a c-axis that is 364 perpendicular to the ab plane with a length that is the stacking repeat 365 distance. This is a good place to save your project (I called it <b><span 366 style='font-family:"Calibri",sans-serif'>kaolinite</span></b>).</p> 1368 367 1369 368 <h2>Part 2. Set up simulation of ideal kaolinite stacking</h2> 1370 369 1371 370 <p class=MsoNormal>In this part of the tutorial well create a stacking model 1372 for Keokuk kaolinite and use <span class=SpellE>DIFFaX</span> to simulate the 1373 powder pattern and compare it to some real data. To begin we need a new phase 1374 that we can declare as faulted. In the main GSAS-II data tree menu do <b 1375 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1376 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Data/Add new 1377 phase</span></b>; I named it <b style='mso-bidi-font-weight:normal'><span 1378 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1379 mso-hansi-theme-font:minor-latin'>Keokuk</span></b>. The General tab for it 1380 will immediately appear.</p> 1381 1382 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1383 id="Picture_x0020_17" o:spid="_x0000_i1035" type="#_x0000_t75" style='width:697.5pt; 1384 height:375pt;visibility:visible;mso-wrap-style:square'> 1385 <v:imagedata src="Stacking%20Faults%20II_files/image018.png" o:title=""/> 1386 </v:shape><![endif]--><![if !vml]><img width=930 height=500 1387 src="Stacking%20Faults%20II_files/image019.gif" v:shapes="Picture_x0020_17"><![endif]></span></p> 1388 1389 <p class=MsoNormal>Change the <b style='mso-bidi-font-weight:normal'><span 1390 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1391 mso-hansi-theme-font:minor-latin'>Phase type</span></b> to <b 1392 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1393 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>faulted</span></b>; 1394 the General tab will be redrawn and a new tab <b style='mso-bidi-font-weight: 1395 normal'><span style='font-family:"Calibri",sans-serif;mso-ascii-theme-font: 1396 minor-latin;mso-hansi-theme-font:minor-latin'>Layers</span></b> will appear. 1397 Select it.</p> 1398 1399 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1400 id="Picture_x0020_18" o:spid="_x0000_i1034" type="#_x0000_t75" style='width:612.75pt; 1401 height:363pt;visibility:visible;mso-wrap-style:square'> 1402 <v:imagedata src="Stacking%20Faults%20II_files/image020.png" o:title=""/> 1403 </v:shape><![endif]--><![if !vml]><img width=817 height=484 1404 src="Stacking%20Faults%20II_files/image021.gif" v:shapes="Picture_x0020_18"><![endif]></span></p> 371 for Keokuk kaolinite and use DIFFaX to simulate the powder pattern and compare 372 it to some real data. To begin we need a new phase that we can declare as 373 faulted. In the main GSAS-II data tree menu do <b><span style='font-family: 374 "Calibri",sans-serif'>Data/Add new phase</span></b>; I named it <b><span 375 style='font-family:"Calibri",sans-serif'>Keokuk</span></b>. The General tab 376 for it will immediately appear.</p> 377 378 <p class=MsoNormal><img width=930 height=500 id="Picture 17" 379 src="Stacking%20Faults%20II_files/image010.gif"></p> 380 381 <p class=MsoNormal>Change the <b><span style='font-family:"Calibri",sans-serif'>Phase 382 type</span></b> to <b><span style='font-family:"Calibri",sans-serif'>faulted</span></b>; 383 the General tab will be redrawn and a new tab <b><span style='font-family:"Calibri",sans-serif'>Layers</span></b> 384 will appear. Select it.</p> 385 386 <p class=MsoNormal><img width=817 height=484 id="Picture 18" 387 src="Stacking%20Faults%20II_files/image011.gif"></p> 1405 388 1406 389 <p class=MsoNormal>We can anticipate (given that kaolinite space group is C1) 1407 that the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1408 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Diffraction 1409 Laue symmetry</span></b> is <b style='mso-bidi-font-weight:normal'><span 1410 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1411 mso-hansi-theme-font:minor-latin'>-1</span></b>. We can enter by hand the 1412 lattice parameters from the kaolinite <span class=SpellE><span class=GramE>abc</span></span>* 1413 phase but an easier method is available. Do <b style='mso-bidi-font-weight: 1414 normal'><span style='font-family:"Calibri",sans-serif;mso-ascii-theme-font: 1415 minor-latin;mso-hansi-theme-font:minor-latin'>Operations/Copy phase cell</span></b>; 1416 a file selection dialog will appear for your current directory and the file <span 1417 class=SpellE><b style='mso-bidi-font-weight:normal'><span style='font-family: 1418 "Calibri",sans-serif;mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1419 minor-latin'>kaolinite.gpx</span></b></span> should be there. Select it; a 1420 small popup will appear listing the available phases. Choose <b 1421 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1422 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>kaolinite <span 1423 class=SpellE><span class=GramE>abc</span></span>*</span></b> and press <b 1424 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1425 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Ok</span></b>; 390 that the <b><span style='font-family:"Calibri",sans-serif'>Diffraction Laue 391 symmetry</span></b> is <b><span style='font-family:"Calibri",sans-serif'>-1</span></b>. 392 We can enter by hand the lattice parameters from the kaolinite abc* phase but 393 an easier method is available. Do <b><span style='font-family:"Calibri",sans-serif'>Operations/Copy 394 phase cell</span></b>; a file selection dialog will appear for your current 395 directory and the file <b><span style='font-family:"Calibri",sans-serif'>kaolinite.gpx</span></b> 396 should be there. Select it; a small popup will appear listing the available 397 phases. Choose <b><span style='font-family:"Calibri",sans-serif'>kaolinite 398 abc*</span></b> and press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>; 1426 399 the Layers window will be redrawn with the new lattice parameters.</p> 1427 400 1428 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1429 id="Picture_x0020_19" o:spid="_x0000_i1033" type="#_x0000_t75" style='width:621.75pt; 1430 height:363pt;visibility:visible;mso-wrap-style:square'> 1431 <v:imagedata src="Stacking%20Faults%20II_files/image022.png" o:title=""/> 1432 </v:shape><![endif]--><![if !vml]><img width=829 height=484 1433 src="Stacking%20Faults%20II_files/image023.gif" v:shapes="Picture_x0020_19"><![endif]></span></p> 1434 1435 <p class=MsoNormal>Next, you need to define the layer. As it would be very tedious 1436 to enter 24 atoms by hand, the alternative is to get them from the previously 1437 created kaolinite <span class=SpellE><span class=GramE>abc</span></span>* 1438 phase. Select the <b style='mso-bidi-font-weight:normal'><span 1439 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1440 mso-hansi-theme-font:minor-latin'>Import new layer</span></b> box; the file 1441 dialog with <span class=SpellE><b style='mso-bidi-font-weight:normal'><span 1442 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1443 mso-hansi-theme-font:minor-latin'>kaolinite.gpx</span></b></span> will appear. 1444 Select the file and press <b style='mso-bidi-font-weight:normal'><span 1445 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1446 mso-hansi-theme-font:minor-latin'>Open</span></b>; again a small popup with two 1447 phases listed will appear. Again select <b style='mso-bidi-font-weight:normal'><span 1448 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1449 mso-hansi-theme-font:minor-latin'>kaolinite <span class=SpellE><span 1450 class=GramE>abc</span></span>*</span></b> and press <b style='mso-bidi-font-weight: 1451 normal'><span style='font-family:"Calibri",sans-serif;mso-ascii-theme-font: 1452 minor-latin;mso-hansi-theme-font:minor-latin'>Ok</span></b>; the Layers page 1453 will be redrawn with a layer (named kaolinite) will be filled out.</p> 1454 1455 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1456 id="Picture_x0020_20" o:spid="_x0000_i1032" type="#_x0000_t75" style='width:621.75pt; 1457 height:375pt;visibility:visible;mso-wrap-style:square'> 1458 <v:imagedata src="Stacking%20Faults%20II_files/image024.png" o:title=""/> 1459 </v:shape><![endif]--><![if !vml]><img width=829 height=500 1460 src="Stacking%20Faults%20II_files/image025.gif" v:shapes="Picture_x0020_20"><![endif]></span></p> 401 <p class=MsoNormal><img width=829 height=484 id="Picture 19" 402 src="Stacking%20Faults%20II_files/image012.gif"></p> 403 404 <p class=MsoNormal>Next, you need to define the layer. As it would be very 405 tedious to enter 24 atoms by hand, the alternative is to get them from the 406 previously created kaolinite abc* phase. Select the <b><span style='font-family: 407 "Calibri",sans-serif'>Import new layer</span></b> box; the file dialog with <b><span 408 style='font-family:"Calibri",sans-serif'>kaolinite.gpx</span></b> will appear. 409 Select the file and press <b><span style='font-family:"Calibri",sans-serif'>Open</span></b>; 410 again a small popup with two phases listed will appear. Again select <b><span 411 style='font-family:"Calibri",sans-serif'>kaolinite abc*</span></b> and press <b><span 412 style='font-family:"Calibri",sans-serif'>Ok</span></b>; the Layers page will be 413 redrawn with a layer (named kaolinite) will be filled out.</p> 414 415 <p class=MsoNormal><img width=829 height=500 id="Picture 20" 416 src="Stacking%20Faults%20II_files/image013.gif"></p> 1461 417 1462 418 <p class=MsoNormal>If you move down to the bottom of the page (if there isnt a 1463 419 scroll bar, just grab an edge of the window & shift it slightly) to find 1464 the one line <b style='mso-bidi-font-weight:normal'><span style='font-family: 1465 "Calibri",sans-serif;mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1466 minor-latin'>Layer-Layer Transition probabilities</span></b>. Change <span 1467 class=SpellE><b style='mso-bidi-font-weight:normal'><span style='font-family: 1468 "Calibri",sans-serif;mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1469 minor-latin'>Dz</span></b></span><b style='mso-bidi-font-weight:normal'><span 1470 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1471 mso-hansi-theme-font:minor-latin'>=1.0</span></b> and press the plot box; the 1472 drawing will show a layer of kaolinite stacked directly above another one.</p> 1473 1474 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1475 id="Picture_x0020_24" o:spid="_x0000_i1031" type="#_x0000_t75" style='width:5in; 1476 height:269.25pt;visibility:visible;mso-wrap-style:square'> 1477 <v:imagedata src="Stacking%20Faults%20II_files/image026.jpg" o:title=""/> 1478 </v:shape><![endif]--><![if !vml]><img width=480 height=359 1479 src="Stacking%20Faults%20II_files/image027.jpg" v:shapes="Picture_x0020_24"><![endif]></span></p> 420 the one line <b><span style='font-family:"Calibri",sans-serif'>Layer-Layer 421 Transition probabilities</span></b>. Change <b><span style='font-family:"Calibri",sans-serif'>Dz=1.0</span></b> 422 and press the plot box; the drawing will show a layer of kaolinite stacked 423 directly above another one.</p> 424 425 <p class=MsoNormal><img width=480 height=359 id="Picture 24" 426 src="Stacking%20Faults%20II_files/image014.jpg"></p> 1480 427 1481 428 <p class=MsoNormal>Compare that to the stacking in kaolinite.</p> 1482 429 1483 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1484 id="Picture_x0020_26" o:spid="_x0000_i1030" type="#_x0000_t75" style='width:5in; 1485 height:269.25pt;visibility:visible;mso-wrap-style:square'> 1486 <v:imagedata src="Stacking%20Faults%20II_files/image028.jpg" o:title=""/> 1487 </v:shape><![endif]--><![if !vml]><img width=480 height=359 1488 src="Stacking%20Faults%20II_files/image029.jpg" v:shapes="Picture_x0020_26"><![endif]></span></p> 430 <p class=MsoNormal><img width=480 height=359 id="Picture 26" 431 src="Stacking%20Faults%20II_files/image015.jpg"></p> 1489 432 1490 433 <p class=MsoNormal>Notice the effect of the offset. The 1<sup>st</sup> row of 1491 SiO<sub>4</sub> <span class=SpellE>tetrahedra</span> are positioned directly 1492 above the AlO<sub>6</sub> <span class=SpellE>octahedra</span> in the real 1493 structure but not in the vertically stacked structure. We can use a bit of 1494 simple geometry to work out what the offset is but first let us see what 1495 happens in the simulation and how it compares to real data.</p> 434 SiO<sub>4</sub> tetrahedra are positioned directly above the AlO<sub>6</sub> 435 octahedra in the real structure but not in the vertically stacked structure. We 436 can use a bit of simple geometry to work out what the offset is but first let 437 us see what happens in the simulation and how it compares to real data.</p> 1496 438 1497 439 <h2>Step 3. Import Keokuk kaolinite data and do 1<sup>st</sup> simulation</h2> 1498 440 1499 441 <p class=MsoNormal>First we need to import the Keokuk kaolinite powder data; do 1500 <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1501 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Import/Powder 1502 Data/from Bruker RAW file</span></b>. Select <b style='mso-bidi-font-weight: 1503 normal'><span style='font-family:"Calibri",sans-serif;mso-ascii-theme-font: 1504 minor-latin;mso-hansi-theme-font:minor-latin'>Keokuk <span class=SpellE>kaolinite.RAW</span></span></b> 1505 from the file dialog box; press <span class=GramE><b style='mso-bidi-font-weight: 1506 normal'><span style='font-family:"Calibri",sans-serif;mso-ascii-theme-font: 1507 minor-latin;mso-hansi-theme-font:minor-latin'>Yes</span></b></span> in the next 1508 popup. A new file dialog appears requesting an instrument parameter file; we 1509 will use an internal default instead. Press <b style='mso-bidi-font-weight: 1510 normal'><span style='font-family:"Calibri",sans-serif;mso-ascii-theme-font: 1511 minor-latin;mso-hansi-theme-font:minor-latin'>Cancel</span></b> and select <b 1512 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1513 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Defaults for 1514 <span class=SpellE>CuKa</span> lab data</span></b> from the next popup. This process 1515 will repeat since the RAW file contains two scans. In the next popup, select 1516 only <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1517 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>kaolinite <span 1518 class=SpellE><span class=GramE>abc</span></span>*</span></b>. There will be two 1519 PWDR scans in the GSAS-II data tree; one covers 2<span style='font-family:Symbol'>Q</span>= 1520 10-90<span style='font-family:"Calibri",sans-serif'>°</span> and the other 1521 covers 2<span style='font-family:Symbol'>Q</span>=80-150°. Only the lower part 1522 of the first one is going to be used in our simulation work as the calculations 1523 become very time consuming for complex structures and high angle data. Select <b 1524 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1525 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>PWDR Keokuk <span 1526 class=SpellE>kaolinite.RAW</span> Scan 1</span></b> from the GSAS-II data tree 1527 make sure it expands; its plot will also show.</p> 1528 1529 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1530 id="Picture_x0020_27" o:spid="_x0000_i1029" type="#_x0000_t75" style='width:525pt; 1531 height:450pt;visibility:visible;mso-wrap-style:square'> 1532 <v:imagedata src="Stacking%20Faults%20II_files/image030.png" o:title=""/> 1533 </v:shape><![endif]--><![if !vml]><img width=700 height=600 1534 src="Stacking%20Faults%20II_files/image031.gif" v:shapes="Picture_x0020_27"><![endif]></span></p> 1535 1536 <p class=MsoNormal>Go to <b style='mso-bidi-font-weight:normal'><span 1537 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1538 mso-hansi-theme-font:minor-latin'>Limits</span></b> and set <span class=SpellE><b 1539 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1540 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Tmax</span></b></span> 1541 to <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1542 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>52.0</span></b>; 1543 that puts the upper limit in a relatively clear part of the pattern. Then go to 1544 Background and set the 1<sup>st</sup> coefficient to 20 (approximately the 1545 background at 2Q=18). Next go to <b style='mso-bidi-font-weight:normal'><span 1546 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1547 mso-hansi-theme-font:minor-latin'>Sample parameters</span></b> and set the <b 1548 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1549 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Histogram 1550 scale</span></b> to something reasonable (I chose <b style='mso-bidi-font-weight: 1551 normal'><span style='font-family:"Calibri",sans-serif;mso-ascii-theme-font: 1552 minor-latin;mso-hansi-theme-font:minor-latin'>20.0</span></b>) and make sure 1553 the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1554 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Diffractometer 442 <b><span style='font-family:"Calibri",sans-serif'>Import/Powder Data/from 443 Bruker RAW file</span></b>. Select <b><span style='font-family:"Calibri",sans-serif'>Keokuk 444 kaolinite.RAW</span></b> from the file dialog box; press <b><span 445 style='font-family:"Calibri",sans-serif'>Yes</span></b> in the next popup. A 446 new file dialog appears requesting an instrument parameter file; we will use an 447 internal default instead. Press <b><span style='font-family:"Calibri",sans-serif'>Cancel</span></b> 448 and select <b><span style='font-family:"Calibri",sans-serif'>Defaults for CuKa 449 lab data</span></b> from the next popup. This process will repeat since the RAW 450 file contains two scans. In the next popup, select only <b><span 451 style='font-family:"Calibri",sans-serif'>kaolinite abc*</span></b>. There will 452 be two PWDR scans in the GSAS-II data tree; one covers 2<span style='font-family: 453 Symbol'>Q</span>= 10-90<span style='font-family:"Calibri",sans-serif'>°</span> 454 and the other covers 2<span style='font-family:Symbol'>Q</span>=80-150°. Only 455 the lower part of the first one is going to be used in our simulation work as 456 the calculations become very time consuming for complex structures and high 457 angle data. Select <b><span style='font-family:"Calibri",sans-serif'>PWDR 458 Keokuk kaolinite.RAW Scan 1</span></b> from the GSAS-II data tree make sure it 459 expands; its plot will also show.</p> 460 461 <p class=MsoNormal><img width=700 height=600 id="Picture 27" 462 src="Stacking%20Faults%20II_files/image016.gif"></p> 463 464 <p class=MsoNormal>Go to <b><span style='font-family:"Calibri",sans-serif'>Limits</span></b> 465 and set <b><span style='font-family:"Calibri",sans-serif'>Tmax</span></b> to <b><span 466 style='font-family:"Calibri",sans-serif'>52.0</span></b>; that puts the upper 467 limit in a relatively clear part of the pattern. Then go to Background and set 468 the 1<sup>st</sup> coefficient to 20 (approximately the background at 2Q=18). 469 Next go to <b><span style='font-family:"Calibri",sans-serif'>Sample parameters</span></b> 470 and set the <b><span style='font-family:"Calibri",sans-serif'>Histogram scale</span></b> 471 to something reasonable (I chose <b><span style='font-family:"Calibri",sans-serif'>20.0</span></b>) 472 and make sure the <b><span style='font-family:"Calibri",sans-serif'>Diffractometer 1555 473 type is Bragg-Brentano</span></b>.</p> 1556 474 1557 475 <p class=MsoNormal>Now we are ready for our 1<sup>st</sup> kaolinite 1558 simulation. Go to <b style='mso-bidi-font-weight:normal'><span 1559 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1560 mso-hansi-theme-font:minor-latin'>Phases/Keokuk</span></b> and select the <b 1561 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1562 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Layers</span></b> 1563 tab. Do <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1564 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Operations/Simulate 1565 pattern</span></b> and press <b style='mso-bidi-font-weight:normal'><span 1566 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1567 mso-hansi-theme-font:minor-latin'>Ok</span></b> in the popup. Select the <b 1568 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1569 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Scan 1</span></b> 1570 pattern and press <b style='mso-bidi-font-weight:normal'><span 1571 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1572 mso-hansi-theme-font:minor-latin'>Ok</span></b>; the simulation will finish 1573 quickly (press <b style='mso-bidi-font-weight:normal'><span style='font-family: 1574 "Calibri",sans-serif;mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1575 minor-latin'>Ok</span></b>) and the new plot will be displayed (Ive zoomed in 1576 a bit).</p> 1577 1578 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1579 id="Picture_x0020_29" o:spid="_x0000_i1028" type="#_x0000_t75" style='width:525pt; 1580 height:450pt;visibility:visible;mso-wrap-style:square'> 1581 <v:imagedata src="Stacking%20Faults%20II_files/image032.png" o:title=""/> 1582 </v:shape><![endif]--><![if !vml]><img width=700 height=600 1583 src="Stacking%20Faults%20II_files/image033.gif" v:shapes="Picture_x0020_29"><![endif]></span>.</p> 476 simulation. Go to <b><span style='font-family:"Calibri",sans-serif'>Phases/Keokuk</span></b> 477 and select the <b><span style='font-family:"Calibri",sans-serif'>Layers</span></b> 478 tab. Do <b><span style='font-family:"Calibri",sans-serif'>Operations/Simulate 479 pattern</span></b> and press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b> 480 in the popup. Select the <b><span style='font-family:"Calibri",sans-serif'>Scan 481 1</span></b> pattern and press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>; 482 the simulation will finish quickly (press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>) 483 and the new plot will be displayed (Ive zoomed in a bit).</p> 484 485 <p class=MsoNormal><img width=700 height=600 id="Picture 29" 486 src="Stacking%20Faults%20II_files/image017.gif">.</p> 1584 487 1585 488 <p class=MsoNormal>As you can see the simulation (green curve) does not fit the … … 1588 491 offset consider the drawing of kaolinite.</p> 1589 492 1590 <p class=MsoNormal><!--[if gte vml 1]><v:shapetype id="_x0000_t32" coordsize="21600,21600" 1591 o:spt="32" o:oned="t" path="m,l21600,21600e" filled="f"> 1592 <v:path arrowok="t" fillok="f" o:connecttype="none"/> 1593 <o:lock v:ext="edit" shapetype="t"/> 1594 </v:shapetype><v:shape id="Straight_x0020_Arrow_x0020_Connector_x0020_32" 1595 o:spid="_x0000_s1027" type="#_x0000_t32" style='position:absolute; 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1682 497 height:199px'><img width=3 height=199 1683 src="Stacking%20Faults%20II_files/image035.gif" v:shapes="Straight_x0020_Connector_x0020_31"></span><![endif]><span 1684 style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_30" 1685 o:spid="_x0000_i1027" type="#_x0000_t75" style='width:360.75pt;height:270pt; 1686 visibility:visible;mso-wrap-style:square'> 1687 <v:imagedata src="Stacking%20Faults%20II_files/image036.jpg" o:title=""/> 1688 </v:shape><![endif]--><![if !vml]><img width=481 height=360 1689 src="Stacking%20Faults%20II_files/image037.jpg" v:shapes="Picture_x0020_30"><![endif]></span></p> 1690 1691 <p class=MsoNormal>The offset <span class=SpellE>Dx</span> is given by the blue 1692 arrow in the above drawing of kaolinite and is in fractional coordinates. 1693 Geometry gives</p> 1694 1695 <p class=MsoNormal><!--[if gte msEquation 12]><m:oMath><i style='mso-bidi-font-style: 1696 normal'><span style='font-family:"Cambria Math",serif'><m:r>Dx</m:r><m:r>= </m:r></span></i><m:f><m:fPr><m:type 1697 m:val="skw"/><span style='font-family:"Cambria Math",serif;mso-ascii-font-family: 1698 "Cambria Math";mso-hansi-font-family:"Cambria Math";font-style:italic; 1699 mso-bidi-font-style:normal'><m:ctrlPr></m:ctrlPr></span></m:fPr><m:num><i 1700 style='mso-bidi-font-style:normal'><span style='font-family:"Cambria Math",serif'><m:r>c</m:r></span></i><m:func><m:funcPr><span 1701 style='font-family:"Cambria Math",serif;mso-ascii-font-family:"Cambria Math"; 1702 mso-hansi-font-family:"Cambria Math";font-style:italic;mso-bidi-font-style: 1703 normal'><m:ctrlPr></m:ctrlPr></span></m:funcPr><m:fName><span 1704 style='font-family:"Cambria Math",serif'><m:r><m:rPr><m:scr m:val="roman"/><m:sty 1705 m:val="p"/></m:rPr>cos</m:r></span></m:fName><m:e><i style='mso-bidi-font-style: 1706 normal'><span style='font-family:"Cambria Math",serif'><m:r>β</m:r></span></i></m:e></m:func></m:num><m:den><i 1707 style='mso-bidi-font-style:normal'><span style='font-family:"Cambria Math",serif'><m:r>a</m:r></span></i></m:den></m:f></m:oMath><![endif]--><![if !msEquation]><span 1708 style='font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-font-family: 1709 "Times New Roman";mso-fareast-theme-font:minor-fareast;position:relative; 1710 top:3.0pt;mso-text-raise:-3.0pt;mso-ansi-language:EN-US;mso-fareast-language: 1711 EN-US;mso-bidi-language:AR-SA'><!--[if gte vml 1]><v:shape id="_x0000_i1025" 1712 type="#_x0000_t75" style='width:79.5pt;height:19.5pt'> 1713 <v:imagedata src="Stacking%20Faults%20II_files/image038.png" o:title="" 1714 chromakey="white"/> 1715 </v:shape><![endif]--><![if !vml]><img width=106 height=26 1716 src="Stacking%20Faults%20II_files/image039.gif" v:shapes="_x0000_i1025"><![endif]></span><![endif]><span 1717 style='mso-spacerun:yes'> </span>Or in this case <b style='mso-bidi-font-weight: 1718 normal'><span style='font-family:"Calibri",sans-serif;mso-ascii-theme-font: 1719 minor-latin;mso-hansi-theme-font:minor-latin'>-0.368</span></b>. Set <span 1720 class=SpellE><b style='mso-bidi-font-weight:normal'><span style='font-family: 1721 "Calibri",sans-serif;mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1722 minor-latin'>Dx</span></b></span> to this value & repeat simulation.</p> 1723 1724 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1725 id="Picture_x0020_33" o:spid="_x0000_i1026" type="#_x0000_t75" style='width:525pt; 1726 height:450pt;visibility:visible;mso-wrap-style:square'> 1727 <v:imagedata src="Stacking%20Faults%20II_files/image040.png" o:title=""/> 1728 </v:shape><![endif]--><![if !vml]><img width=700 height=600 1729 src="Stacking%20Faults%20II_files/image041.gif" v:shapes="Picture_x0020_33"><![endif]></span></p> 498 src="Stacking%20Faults%20II_files/image019.gif"></span><img width=481 499 height=360 id="Picture 30" src="Stacking%20Faults%20II_files/image020.jpg"></p> 500 501 <p class=MsoNormal>The offset Dx is given by the blue arrow in the above 502 drawing of kaolinite and is in fractional coordinates. Geometry gives</p> 503 504 <p class=MsoNormal><span 505 style='font-size:12.0pt;font-family:"Times New Roman",serif;position:relative; 506 top:3.0pt'><img width=106 height=26 507 src="Stacking%20Faults%20II_files/image021.gif"></span> Or in this case <b><span 508 style='font-family:"Calibri",sans-serif'>-0.368</span></b>. Set <b><span 509 style='font-family:"Calibri",sans-serif'>Dx</span></b> to this value & 510 repeat simulation.</p> 511 512 <p class=MsoNormal><img width=700 height=600 id="Picture 33" 513 src="Stacking%20Faults%20II_files/image022.gif"></p> 1730 514 1731 515 <p class=MsoNormal>There is some improvement but some parts are not very well 1732 516 represented. Recall from the triclinic kaolinite lattice parameters that <span 1733 517 style='font-family:Symbol'>a</span> was 91.7°; that will produce a small offset 1734 in Dy. Using the same kind of geometry math gives <span class=SpellE><b 1735 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1736 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Dy</span></b></span><b 1737 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1738 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>=-0.0246</span></b>. 1739 Enter this value & repeat the simulation again. This gives a much better 1740 fit to the observed pattern, but the simulated peaks are too sharp; this can be 1741 fixed by changing the U<span class=GramE>,V,W</span> Instrument parameters. Id 1742 just set <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1743 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>W=40</span></b> 1744 and the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1745 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Histogram 1746 scale</span></b> (in <b style='mso-bidi-font-weight:normal'><span 1747 style='font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin; 1748 mso-hansi-theme-font:minor-latin'>Sample parameters</span></b>) to <b 1749 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri",sans-serif; 1750 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>40</span></b> 1751 and try again.</p> 1752 1753 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1754 id="Picture_x0020_34" o:spid="_x0000_i1025" type="#_x0000_t75" style='width:525pt; 1755 height:450pt;visibility:visible;mso-wrap-style:square'> 1756 <v:imagedata src="Stacking%20Faults%20II_files/image042.png" o:title=""/> 1757 </v:shape><![endif]--><![if !vml]><img width=700 height=600 1758 src="Stacking%20Faults%20II_files/image043.gif" v:shapes="Picture_x0020_34"><![endif]></span></p> 518 in Dy. Using the same kind of geometry math gives <b><span style='font-family: 519 "Calibri",sans-serif'>Dy=-0.0246</span></b>. Enter this value & repeat the 520 simulation again. This gives a much better fit to the observed pattern, but the 521 simulated peaks are too sharp; this can be fixed by changing the U,V,W 522 Instrument parameters. Id just set <b><span style='font-family:"Calibri",sans-serif'>W=40</span></b> 523 and the <b><span style='font-family:"Calibri",sans-serif'>Histogram scale</span></b> 524 (in <b><span style='font-family:"Calibri",sans-serif'>Sample parameters</span></b>) 525 to <b><span style='font-family:"Calibri",sans-serif'>40</span></b> and try 526 again.</p> 527 528 <p class=MsoNormal><img width=700 height=600 id="Picture 34" 529 src="Stacking%20Faults%20II_files/image023.gif"></p> 1759 530 1760 531 <p class=MsoNormal>That is a pretty good fit for a stacking simulation. By
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