Changeset 2274 for Tutorials/StackingFaults-II/Stacking Faults II.htm
- Timestamp:
- May 15, 2016 3:00:13 PM (7 years ago)
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- 1 edited
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Tutorials/StackingFaults-II/Stacking Faults II.htm
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200 1007 {mso-style-name:msochpdefault; 1008 mso-style-unhide:no; 1009 mso-margin-top-alt:auto; 201 1010 margin-right:0in; 1011 mso-margin-bottom-alt:auto; 202 1012 margin-left:0in; 1013 mso-pagination:widow-orphan; 203 1014 font-size:10.0pt; 204 font-family:"Calibri",sans-serif;} 1015 font-family:"Calibri",sans-serif; 1016 mso-fareast-font-family:"Times New Roman"; 1017 mso-fareast-theme-font:minor-fareast; 1018 mso-bidi-font-family:"Times New Roman";} 1019 span.SpellE 1020 {mso-style-name:""; 1021 mso-spl-e:yes;} 1022 span.GramE 1023 {mso-style-name:""; 1024 mso-gram-e:yes;} 205 1025 .MsoChpDefault 206 {font-size:10.0pt; 207 font-family:"Calibri",sans-serif;} 1026 {mso-style-type:export-only; 1027 mso-default-props:yes; 1028 font-size:10.0pt; 1029 mso-ansi-font-size:10.0pt; 1030 mso-bidi-font-size:10.0pt; 1031 font-family:"Calibri",sans-serif; 1032 mso-ascii-font-family:Calibri; 1033 mso-hansi-font-family:Calibri;} 208 1034 @page WordSection1 209 1035 {size:8.5in 11.0in; 210 margin:1.0in 1.0in 1.0in 1.0in;} 1036 margin:1.0in 1.0in 1.0in 1.0in; 1037 mso-header-margin:.5in; 1038 mso-footer-margin:.5in; 1039 mso-paper-source:0;} 211 1040 div.WordSection1 212 1041 {page:WordSection1;} 213 1042 --> 214 1043 </style> 215 1044 <!--[if gte mso 10]> 1045 <style> 1046 /* Style Definitions */ 1047 table.MsoNormalTable 1048 {mso-style-name:"Table Normal"; 1049 mso-tstyle-rowband-size:0; 1050 mso-tstyle-colband-size:0; 1051 mso-style-noshow:yes; 1052 mso-style-priority:99; 1053 mso-style-parent:""; 1054 mso-padding-alt:0in 5.4pt 0in 5.4pt; 1055 mso-para-margin:0in; 1056 mso-para-margin-bottom:.0001pt; 1057 mso-pagination:widow-orphan; 1058 font-size:10.0pt; 1059 font-family:"Calibri",sans-serif;} 1060 </style> 1061 <![endif]--><!--[if gte mso 9]><xml> 1062 <o:shapedefaults v:ext="edit" spidmax="1026"/> 1063 </xml><![endif]--><!--[if gte mso 9]><xml> 1064 <o:shapelayout v:ext="edit"> 1065 <o:idmap v:ext="edit" data="1"/> 1066 </o:shapelayout></xml><![endif]--> 216 1067 </head> 217 1068 218 <body lang=EN-US link=blue vlink=purple >1069 <body lang=EN-US link=blue vlink=purple style='tab-interval:.5in'> 219 1070 220 1071 <div class=WordSection1> 221 1072 222 <h1>Stacking Fault Simulations II</h1> 1073 <h1><span style='mso-fareast-font-family:"Times New Roman"'>Stacking Fault 1074 Simulations II<o:p></o:p></span></h1> 223 1075 224 1076 <p class=MsoNormal>In this exercise you will simulate some diffraction patterns 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 1077 from kaolinite clays. Kaolinite, <span class=GramE>Al<sub>2</sub>Si<sub>2</sub>O<sub>5</sub>(</span>OH)<sub>4</sub>, 1078 is a 1:1 layer silicate with a single unique sheet with AlO<sub>6</sub> <span 1079 class=SpellE>octahedra</span> on one side and SiO<sub>4</sub> <span 1080 class=SpellE>tetrahedra</span> on the other. The layers stack with an offset to 1081 ideally form a triclinic C1 lattice (<span class=SpellE>Bish</span> & Von 229 1082 Dreele, 1989, Clay & Clay Min. 37, 289-296) for a sample of the most 230 1083 ordered form of kaolinite from Keokuk, Iowa. Kaolinites from other locations evidently … … 233 1086 Bragg-Brentano pattern of Keokuk kaolinite and a less ordered one from 234 1087 Washington County, Georgia (Clay Minerals Society Standard KGa-1b) collected 235 with CuKa radiation on a Bruker instrument and thus in the Bruker RAW file 236 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> 1088 with <span class=SpellE>CuKa</span> radiation on a Bruker instrument and thus 1089 in the Bruker RAW file format. The KGa-1b sample contains a small amount of <span 1090 class=SpellE>anatase</span> (TiO<sub>2</sub>) and the Keokuk kaolinite has some 1091 <span class=SpellE>dickite</span> (different ordered stacking of kaolinite 1092 layers).</p> 239 1093 240 1094 <p class=MsoNormal>If you have not done so already, start GSAS-II.</p> 241 1095 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 1096 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Part 1. Creating 1097 kaolinite layer<o:p></o:p></span></h2> 1098 1099 <p class=MsoNormal>In this initial step we will load from a <span class=SpellE>cif</span> 1100 file the structure of kaolinite, draw it to see the layer structure and then 1101 transform it into forms suitable for stacking simulations. To begin do <b><span 247 1102 style='font-family:"Calibri",sans-serif'>Import/Phase/from CIF file</span></b>; 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 1103 from the file dialog select <span class=SpellE><b><span style='font-family: 1104 "Calibri",sans-serif'>kaolinite.cif</span></b></span>. After the are you sure 1105 popup, there will be another warning you that 4 atom types (O-H) were not 1106 recognized chemical element symbols and they were substituted by <span 1107 class=SpellE>Xe</span> to make them obvious in the atom list. Press <b><span 252 1108 style='font-family:"Calibri",sans-serif'>Ok</span></b>; you are offered a 253 1109 chance to change the phase name, I used <b><span style='font-family:"Calibri",sans-serif'>kaolinite</span></b>. 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 22" 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 1110 The General tab is displayed (notice the presence of <span class=SpellE>Xe</span> 1111 in the element table).</p> 1112 1113 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=930 height=500 1114 id="_x0000_i1043" src="Stacking%20Faults%20II_files/image001.gif"></span></p> 1115 1116 <p class=MsoNormal>To fix the <span class=SpellE>Xe</span> atoms (they should 1117 be O), select <b><span style='font-family:"Calibri",sans-serif'>Atoms</span></b> 1118 and then double click the <b><span style='font-family:"Calibri",sans-serif'>Type</span></b> 1119 column heading; a small popup will appear. Select <span class=SpellE><b><span 1120 style='font-family:"Calibri",sans-serif'>Xe</span></b></span> & press <b><span 1121 style='font-family:"Calibri",sans-serif'>Ok</span></b>; the <span class=SpellE>Xe</span> 1122 atoms at the bottom of the atom table will be highlighted. Next select <b><span 265 1123 style='font-family:"Calibri",sans-serif'>Edit/Modify atom parameters</span></b> 266 from the Phase Data menu; a new popup will appear.</p> 267 268 <p class=MsoNormal><img width=228 height=268 269 src="Stacking%20Faults%20II_files/image002.gif"></p> 270 271 <p class=MsoNormal>Select <b><span style='font-family:"Calibri",sans-serif'>Type</span></b> 272 & press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>; a 273 periodic table of the element will appear. Select <b><span style='font-family: 274 "Calibri",sans-serif'>O</span></b> from the O-atom pulldown; the structure will 275 be drawn with Al, Si & O atoms only.</p> 276 277 <p class=MsoNormal><img width=479 height=358 278 src="Stacking%20Faults%20II_files/image003.jpg"></p> 1124 from the Phase Data menu; a new popup will appear. Select <b><span 1125 style='font-family:"Calibri",sans-serif'>Type</span></b> & press <b><span 1126 style='font-family:"Calibri",sans-serif'>Ok</span></b>; a periodic table of the 1127 element will appear. Select <b><span style='font-family:"Calibri",sans-serif'>O</span></b> 1128 from the O-atom pulldown; the structure will be drawn with Al, Si & O atoms 1129 only.</p> 1130 1131 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=479 height=358 1132 id="_x0000_i1042" src="Stacking%20Faults%20II_files/image003.jpg"></span></p> 279 1133 280 1134 <p class=MsoNormal>To better visualize the stacking layer, select the <b><span … … 290 1144 layering along the c-axis (blue line) will be evident.</p> 291 1145 292 <p class=MsoNormal>< img width=480 height=359293 src="Stacking%20Faults%20II_files/image004.jpg"></p>294 295 <p class=MsoNormal>One can easily see the layer of SiO<sub>4</sub> tetrahedra296 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 DIFFaX301 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=339310 src="Stacking%20Faults%20II_files/image005.gif"></p>1146 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=480 height=359 1147 id="_x0000_i1041" src="Stacking%20Faults%20II_files/image004.jpg"></span></p> 1148 1149 <p class=MsoNormal>One can easily see the layer of SiO<sub>4</sub> <span 1150 class=SpellE>tetrahedra</span> and AlO<sub>6</sub> <span class=SpellE>octahedra</span>. 1151 Also notice that the next layer (represented by the 4 O atoms at the bottom of 1152 the above drawing are offset giving a triclinic lattice.</p> 1153 1154 <p class=MsoNormal>The stacking fault simulation calculation via <span 1155 class=SpellE>DIFFaX</span> routines requires that the stacking layers be defined 1156 in a coordinate system that has the stacking direction perpendicular to the 1157 stacking plane defined as the c-axis. This requires transformation of the unit 1158 cell and atom coordinates; a suitable tool exists in GSAS-II to do this. Select 1159 the <b><span style='font-family:"Calibri",sans-serif'>General</span></b> tab and 1160 do <b><span style='font-family:"Calibri",sans-serif'>Compute/Transform</span></b>; 1161 a popup window will appear.</p> 1162 1163 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=350 height=339 1164 id="_x0000_i1040" src="Stacking%20Faults%20II_files/image005.gif"></span></p> 311 1165 312 1166 <p class=MsoNormal>Note that this allows one to transform the structure … … 314 1168 and then select those that are unique according to a selected space group. The 315 1169 pulldown gives a selection of commonly used transformations; we want the last 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 case P-1 320 should be used. If you press <b><span style='font-family:"Calibri",sans-serif'>Test</span></b>, 1170 one, <span class=SpellE><span class=GramE><b><span style='font-family:"Calibri",sans-serif'>abc</span></b></span></span><b><span 1171 style='font-family:"Calibri",sans-serif'>*</span></b>, which satisfies the 1172 stacking fault requirement. Select it; notice that the space group is changed 1173 to P1. Leave this as the kaolinite layer has no symmetry; in other 1174 circumstances the layer may have an inversion center in which case P-1 should 1175 be used. If you press <b><span style='font-family:"Calibri",sans-serif'>Test</span></b>, 321 1176 the new lattice parameters will be shown.</p> 322 1177 323 <p class=MsoNormal><img width=350 height=339 324 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 1178 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=350 height=339 1179 id="_x0000_i1039" src="Stacking%20Faults%20II_files/image006.gif"></span></p> 1180 1181 <p class=MsoNormal><span class=GramE>The a</span> & b axes stay the same, 1182 but c is now smaller (the interlayer distance in kaolinite) and <span 1183 style='font-family:Symbol'>a</span> & <span style='font-family:Symbol'>b</span> 1184 = 90 (<span style='font-family:Symbol'>g</span> is unchanged). Press <b><span 1185 style='font-family:"Calibri",sans-serif'>Ok</span></b>; a new phase (kaolinite <span 1186 class=SpellE><span class=GramE>abc</span></span>*) will be made and its General 1187 tab will be shown immediately. Select the <b><span style='font-family:"Calibri",sans-serif'>Draw 332 1188 Atoms</span></b> tab to see the resulting structure.</p> 333 1189 334 <p class=MsoNormal>< img width=471 height=352335 src="Stacking%20Faults%20II_files/image007.jpg"></p>1190 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=471 height=352 1191 id="_x0000_i1038" src="Stacking%20Faults%20II_files/image007.jpg"></span></p> 336 1192 337 1193 <p class=MsoNormal>To see what this layer looks like with more of it drawn, you … … 353 1209 style='font-family:"Calibri",sans-serif'>Style</span></b> column heading and 354 1210 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'><img 358 width=477 height=357 src="Stacking%20Faults%20II_files/image009.jpg"></p> 359 360 <p class=MsoNormal>This structure is now suitable for use in DIFFaX 361 calculations; the cell has a c-axis that is perpendicular to the ab plane with a 362 length that is the stacking repeat distance. This is a good place to save your 363 project (I called it <b><span style='font-family:"Calibri",sans-serif'>kaolinite</span></b>).</p> 364 365 <h2>Part 2. Set up simulation of ideal kaolinite stacking</h2> 1211 the drawing should look like (after some zooming/shifting/rotation).<o:p></o:p></p> 1212 1213 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=477 height=357 id="_x0000_i1037" 1214 src="Stacking%20Faults%20II_files/image009.jpg"></span></p> 1215 1216 <p class=MsoNormal>This structure is now suitable for use in <span 1217 class=SpellE>DIFFaX</span> calculations; the cell has a c-axis that is 1218 perpendicular to the ab plane with a length that is the stacking repeat 1219 distance. This is a good place to save your project (I called it <b><span 1220 style='font-family:"Calibri",sans-serif'>kaolinite</span></b>).</p> 1221 1222 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Part 2. Set up 1223 simulation of ideal kaolinite stacking<o:p></o:p></span></h2> 366 1224 367 1225 <p class=MsoNormal>In this part of the tutorial well create a stacking model 368 for Keokuk kaolinite and use DIFFaX to simulate the powder pattern and compare369 it to some real data. To begin we need a new phase that we can declare as 370 faulted. In the main GSAS-II data tree menu do <b><span style='font-family: 371 "Calibri",sans-serif'>Data/Add new phase</span></b>; I named it <b><span 372 style='font-family:"Calibri",sans-serif'>Keokuk</span></b>. The General tab 373 for it will immediately appear.</p>374 375 <p class=MsoNormal>< img width=930 height=500376 src="Stacking%20Faults%20II_files/image010.gif"></p>1226 for Keokuk kaolinite and use <span class=SpellE>DIFFaX</span> to simulate the 1227 powder pattern and compare it to some real data. To begin we need a new phase 1228 that we can declare as faulted. In the main GSAS-II data tree menu do <b><span 1229 style='font-family:"Calibri",sans-serif'>Data/Add new phase</span></b>; I named 1230 it <b><span style='font-family:"Calibri",sans-serif'>Keokuk</span></b>. The 1231 General tab for it will immediately appear.</p> 1232 1233 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=930 height=500 1234 id="_x0000_i1036" src="Stacking%20Faults%20II_files/image010.gif"></span></p> 377 1235 378 1236 <p class=MsoNormal>Change the <b><span style='font-family:"Calibri",sans-serif'>Phase … … 381 1239 will appear. Select it.</p> 382 1240 383 <p class=MsoNormal>< img width=817 height=484384 src="Stacking%20Faults%20II_files/image011.gif"></p>1241 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=817 height=484 1242 id="_x0000_i1035" src="Stacking%20Faults%20II_files/image011.gif"></span></p> 385 1243 386 1244 <p class=MsoNormal>We can anticipate (given that kaolinite space group is C1) 387 1245 that the <b><span style='font-family:"Calibri",sans-serif'>Diffraction Laue 388 1246 symmetry</span></b> is <b><span style='font-family:"Calibri",sans-serif'>-1</span></b>. 389 We can enter by hand the lattice parameters from the kaolinite abc* phase but 390 an easier method is available. Do <b><span style='font-family:"Calibri",sans-serif'>Operations/Copy 1247 We can enter by hand the lattice parameters from the kaolinite <span 1248 class=SpellE><span class=GramE>abc</span></span>* phase but an easier method is 1249 available. Do <b><span style='font-family:"Calibri",sans-serif'>Operations/Copy 391 1250 phase cell</span></b>; a file selection dialog will appear for your current 392 directory and the file < b><span style='font-family:"Calibri",sans-serif'>kaolinite.gpx</span></b>1251 directory and the file <span class=SpellE><b><span style='font-family:"Calibri",sans-serif'>kaolinite.gpx</span></b></span> 393 1252 should be there. Select it; a small popup will appear listing the available 394 phases. Choose <b><span style='font-family:"Calibri",sans-serif'>kaolinite 395 abc*</span></b> and press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>; 396 the Layers window will be redrawn with the new lattice parameters.</p> 397 398 <p class=MsoNormal><img width=829 height=484 399 src="Stacking%20Faults%20II_files/image012.gif"></p> 1253 phases. Choose <b><span style='font-family:"Calibri",sans-serif'>kaolinite <span 1254 class=SpellE><span class=GramE>abc</span></span>*</span></b> and press <b><span 1255 style='font-family:"Calibri",sans-serif'>Ok</span></b>; the Layers window will 1256 be redrawn with the new lattice parameters.</p> 1257 1258 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=829 height=484 1259 id="_x0000_i1034" src="Stacking%20Faults%20II_files/image012.gif"></span></p> 400 1260 401 1261 <p class=MsoNormal>Next, you need to define the layer. As it would be very 402 tedious to enter 24 atoms by hand, the alternative is to get them from the 403 previously created kaolinite abc* phase. Select the <b><span style='font-family: 404 "Calibri",sans-serif'>Import new layer</span></b> box; the file dialog with <b><span 405 style='font-family:"Calibri",sans-serif'>kaolinite.gpx</span></b> will appear. 406 Select the file and press <b><span style='font-family:"Calibri",sans-serif'>Open</span></b>; 1262 tedious to enter 24 atoms by hand, the alternative is to get them from the previously 1263 created kaolinite <span class=SpellE><span class=GramE>abc</span></span>* 1264 phase. Select the <b><span style='font-family:"Calibri",sans-serif'>Import new 1265 layer</span></b> box; the file dialog with <span class=SpellE><b><span 1266 style='font-family:"Calibri",sans-serif'>kaolinite.gpx</span></b></span> will 1267 appear. Select the file and press <b><span style='font-family:"Calibri",sans-serif'>Open</span></b>; 407 1268 again a small popup with two phases listed will appear. Again select <b><span 408 style='font-family:"Calibri",sans-serif'>kaolinite abc*</span></b> and press <b><span 409 style='font-family:"Calibri",sans-serif'>Ok</span></b>; the Layers page will be 410 redrawn with a layer (named kaolinite) will be filled out.</p> 411 412 <p class=MsoNormal><img width=829 height=500 413 src="Stacking%20Faults%20II_files/image013.gif"></p> 1269 style='font-family:"Calibri",sans-serif'>kaolinite <span class=SpellE><span 1270 class=GramE>abc</span></span>*</span></b> and press <b><span style='font-family: 1271 "Calibri",sans-serif'>Ok</span></b>; the Layers page will be redrawn with a 1272 layer (named kaolinite) will be filled out.</p> 1273 1274 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=829 height=500 1275 id="_x0000_i1033" src="Stacking%20Faults%20II_files/image013.gif"></span></p> 414 1276 415 1277 <p class=MsoNormal>If you move down to the bottom of the page (if there isnt a 416 1278 scroll bar, just grab an edge of the window & shift it slightly) to find 417 1279 the one line <b><span style='font-family:"Calibri",sans-serif'>Layer-Layer 418 Transition probabilities</span></b>. Change <b><span style='font-family:"Calibri",sans-serif'>Dz=1.0</span></b> 419 and press the plot box; the drawing will show a layer of kaolinite stacked 420 directly above another one.</p> 421 422 <p class=MsoNormal><img width=480 height=359 423 src="Stacking%20Faults%20II_files/image014.jpg"></p> 1280 Transition probabilities</span></b>. Change <span class=SpellE><b><span 1281 style='font-family:"Calibri",sans-serif'>Dz</span></b></span><b><span 1282 style='font-family:"Calibri",sans-serif'>=1.0</span></b> and press the plot 1283 box; the drawing will show a layer of kaolinite stacked directly above another 1284 one.</p> 1285 1286 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=480 height=359 1287 id="_x0000_i1032" src="Stacking%20Faults%20II_files/image014.jpg"></span></p> 424 1288 425 1289 <p class=MsoNormal>Compare that to the stacking in kaolinite.</p> 426 1290 427 <p class=MsoNormal>< img width=480 height=359428 src="Stacking%20Faults%20II_files/image015.jpg"></p>1291 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=480 height=359 1292 id="_x0000_i1031" src="Stacking%20Faults%20II_files/image015.jpg"></span></p> 429 1293 430 1294 <p class=MsoNormal>Notice the effect of the offset. The 1<sup>st</sup> row of 431 SiO<sub>4</sub> tetrahedra are positioned directly above the AlO<sub>6</sub> 432 octahedra in the real structure but not in the vertically stacked structure. We 433 can use a bit of simple geometry to work out what the offset is but first let 434 us see what happens in the simulation and how it compares to real data.</p> 435 436 <h2>Step 3. Import Keokuk kaolinite data and do 1<sup>st</sup> simulation</h2> 1295 SiO<sub>4</sub> <span class=SpellE>tetrahedra</span> are positioned directly 1296 above the AlO<sub>6</sub> <span class=SpellE>octahedra</span> in the real 1297 structure but not in the vertically stacked structure. We can use a bit of 1298 simple geometry to work out what the offset is but first let us see what 1299 happens in the simulation and how it compares to real data.</p> 1300 1301 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Step 3. Import 1302 Keokuk kaolinite data and do 1<sup>st</sup> simulation<o:p></o:p></span></h2> 437 1303 438 1304 <p class=MsoNormal>First we need to import the Keokuk kaolinite powder data; do 439 1305 <b><span style='font-family:"Calibri",sans-serif'>Import/Powder Data/from 440 1306 Bruker RAW file</span></b>. Select <b><span style='font-family:"Calibri",sans-serif'>Keokuk 441 kaolinite.RAW</span></b> from the file dialog box; press <b><span 442 style='font-family:"Calibri",sans-serif'>Yes</span></b> in the next popup. A 443 new file dialog appears requesting an instrument parameter file; we will use an 444 internal default instead. Press <b><span style='font-family:"Calibri",sans-serif'>Cancel</span></b> 445 and select <b><span style='font-family:"Calibri",sans-serif'>Defaults for CuKa 446 lab data</span></b> from the next popup. This process will repeat since the RAW 447 file contains two scans. In the next popup, select only <b><span 448 style='font-family:"Calibri",sans-serif'>kaolinite abc*</span></b>. There will 1307 <span class=SpellE>kaolinite.RAW</span></span></b> from the file dialog box; 1308 press <span class=GramE><b><span style='font-family:"Calibri",sans-serif'>Yes</span></b></span> 1309 in the next popup. A new file dialog appears requesting an instrument parameter 1310 file; we will use an internal default instead. Press <b><span style='font-family: 1311 "Calibri",sans-serif'>Cancel</span></b> and select <b><span style='font-family: 1312 "Calibri",sans-serif'>Defaults for <span class=SpellE>CuKa</span> lab data</span></b> 1313 from the next popup. This process will repeat since the RAW file contains two 1314 scans. In the next popup, select only <b><span style='font-family:"Calibri",sans-serif'>kaolinite 1315 <span class=SpellE><span class=GramE>abc</span></span>*</span></b>. There will 449 1316 be two PWDR scans in the GSAS-II data tree; one covers 2<span style='font-family: 450 1317 Symbol'>Q</span>= 10-90<span style='font-family:"Calibri",sans-serif'>°</span> … … 453 1320 the calculations become very time consuming for complex structures and high 454 1321 angle data. Select <b><span style='font-family:"Calibri",sans-serif'>PWDR 455 Keokuk kaolinite.RAW Scan 1</span></b> from the GSAS-II data tree make sure it456 expands; its plot will also show.</p>457 458 <p class=MsoNormal>< img width=700 height=600459 src="Stacking%20Faults%20II_files/image016.gif"></p>1322 Keokuk <span class=SpellE>kaolinite.RAW</span> Scan 1</span></b> from the 1323 GSAS-II data tree make sure it expands; its plot will also show.</p> 1324 1325 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=700 height=600 1326 id="_x0000_i1030" src="Stacking%20Faults%20II_files/image016.gif"></span></p> 460 1327 461 1328 <p class=MsoNormal>Go to <b><span style='font-family:"Calibri",sans-serif'>Limits</span></b> 462 and set < b><span style='font-family:"Calibri",sans-serif'>Tmax</span></b> to <b><span463 style='font-family:"Calibri",sans-serif'>52.0</span></b>; that puts the upper 464 limit in a relatively clear part of the pattern. Then go to Background and set 465 the 1<sup>st</sup> coefficient to 20 (approximately the background at 2Q=18). 466 Next go to <b><span style='font-family:"Calibri",sans-serif'>Sample parameters</span></b> 467 and set the <b><span style='font-family:"Calibri",sans-serif'>Histogram scale</span></b> 468 to something reasonable (I chose <b><span style='font-family:"Calibri",sans-serif'>20.0</span></b>) 469 and make sure the <b><span style='font-family:"Calibri",sans-serif'>Diffractometer 470 type is Bragg-Brentano</span></b>.</p>1329 and set <span class=SpellE><b><span style='font-family:"Calibri",sans-serif'>Tmax</span></b></span> 1330 to <b><span style='font-family:"Calibri",sans-serif'>52.0</span></b>; that puts 1331 the upper limit in a relatively clear part of the pattern. Then go to 1332 Background and set the 1<sup>st</sup> coefficient to 20 (approximately the 1333 background at 2Q=18). Next go to <b><span style='font-family:"Calibri",sans-serif'>Sample 1334 parameters</span></b> and set the <b><span style='font-family:"Calibri",sans-serif'>Histogram 1335 scale</span></b> to something reasonable (I chose <b><span style='font-family: 1336 "Calibri",sans-serif'>20.0</span></b>) and make sure the <b><span 1337 style='font-family:"Calibri",sans-serif'>Diffractometer type is Bragg-Brentano</span></b>.</p> 471 1338 472 1339 <p class=MsoNormal>Now we are ready for our 1<sup>st</sup> kaolinite … … 480 1347 and the new plot will be displayed (Ive zoomed in a bit).</p> 481 1348 482 <p class=MsoNormal>< img width=700 height=600483 src="Stacking%20Faults%20II_files/image017.gif">.</p>1349 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=700 height=600 1350 id="_x0000_i1029" src="Stacking%20Faults%20II_files/image017.gif"></span>.</p> 484 1351 485 1352 <p class=MsoNormal>As you can see the simulation (green curve) does not fit the 486 1353 data (blue crosses) at all mostly due to the incorrect layer offset although 487 1354 the 1<sup>st</sup> peak seems to be positioned correctly. To work out the 488 offset consider the drawing of kaolinite.</p> 489 490 <p class=MsoNormal><span style='position:absolute;z-index:251661312'><span 491 style='position:absolute;z-index:251660288'><img width=480 height=338 492 id="Picture 23" src="Stacking%20Faults%20II_files/image002.gif"></p> 493 494 <p class=MsoNormal>The offset Dx is given by the blue arrow in the above 495 drawing of kaolinite and is in fractional coordinates. Geometry gives</p> 496 497 <p class=MsoNormal><span style='position:relative;top:3pt'><img width=106 498 height=26 src="Stacking%20Faults%20II_files/image021.gif"> Or in this case 499 <b><span style='font-family:"Calibri",sans-serif'>-0.368</span></b>. Set <b><span 500 style='font-family:"Calibri",sans-serif'>Dx</span></b> to this value & 501 repeat simulation.</p> 502 503 <p class=MsoNormal><img width=700 height=600 504 src="Stacking%20Faults%20II_files/image022.gif"></p> 1355 offset consider the drawing of kaolinite.<o:p></o:p></p> 1356 1357 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=480 height=338 id="_x0000_i1028" 1358 src="Stacking%20Faults%20II_files/image002.gif"></span></p> 1359 1360 <p class=MsoNormal>The offset <span class=SpellE>Dx</span> is given by the blue 1361 arrow in the above drawing of kaolinite and is in fractional coordinates. 1362 Geometry gives<o:p></o:p></p> 1363 1364 <p class=MsoNormal><span style='position:relative;top:3pt'><span 1365 style='mso-no-proof:yes'><img width=106 height=26 id="_x0000_i1027" 1366 src="Stacking%20Faults%20II_files/image021.gif"></span> Or in this case <b><span 1367 style='font-family:"Calibri",sans-serif'>-0.368</span></b>. Set <span 1368 class=SpellE><b><span style='font-family:"Calibri",sans-serif'>Dx</span></b></span> 1369 to this value & repeat simulation.</p> 1370 1371 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=700 height=600 1372 id="_x0000_i1026" src="Stacking%20Faults%20II_files/image022.gif"></span></p> 505 1373 506 1374 <p class=MsoNormal>There is some improvement but some parts are not very well 507 1375 represented. Recall from the triclinic kaolinite lattice parameters that <span 508 1376 style='font-family:Symbol'>a</span> was 91.7°; that will produce a small offset 509 in Dy. Using the same kind of geometry math gives <b><span style='font-family: 510 "Calibri",sans-serif'>Dy=-0.0246</span></b>. Enter this value & repeat the 511 simulation again. This gives a much better fit to the observed pattern, but the 512 simulated peaks are too sharp; this can be fixed by changing the U,V,W 513 Instrument parameters. Id just set <b><span style='font-family:"Calibri",sans-serif'>W=40</span></b> 514 and the <b><span style='font-family:"Calibri",sans-serif'>Histogram scale</span></b> 515 (in <b><span style='font-family:"Calibri",sans-serif'>Sample parameters</span></b>) 516 to <b><span style='font-family:"Calibri",sans-serif'>40</span></b> and try 517 again.</p> 518 519 <p class=MsoNormal><img width=700 height=600 520 src="Stacking%20Faults%20II_files/image023.gif"></p> 1377 in Dy. Using the same kind of geometry math gives <span class=SpellE><b><span 1378 style='font-family:"Calibri",sans-serif'>Dy</span></b></span><b><span 1379 style='font-family:"Calibri",sans-serif'>=-0.0246</span></b>. Enter this value 1380 & repeat the simulation again. This gives a much better fit to the observed 1381 pattern, but the simulated peaks are too sharp; this can be fixed by changing 1382 the U<span class=GramE>,V,W</span> Instrument parameters. Id just set <b><span 1383 style='font-family:"Calibri",sans-serif'>W=40</span></b> and the <b><span 1384 style='font-family:"Calibri",sans-serif'>Histogram scale</span></b> (in <b><span 1385 style='font-family:"Calibri",sans-serif'>Sample parameters</span></b>) to <b><span 1386 style='font-family:"Calibri",sans-serif'>40</span></b> and try again.</p> 1387 1388 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=700 height=600 1389 id="_x0000_i1025" src="Stacking%20Faults%20II_files/image023.gif"></span></p> 521 1390 522 1391 <p class=MsoNormal>That is a pretty good fit for a stacking simulation. By … … 526 1395 small range can be used to help with optimization, but in this case it would be 527 1396 far easier to do a Rietveld refinement for this well ordered kaolinite. Save 528 your project as you will need it for the next part of the exercise.</p> 529 530 </span></span></span></div> 531 1397 your project as you will need it for the next part of the exercise.<o:p></o:p></p> 1398 1399 </span></div> 1400 1401 </span></span></span> 532 1402 </body> 533 1403
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