# Changeset 3553 for Tutorials/StackingFaults-I

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Timestamp:
Aug 3, 2018 10:51:26 PM (3 years ago)
Message:

finish web tutorials for now

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1 edited

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• ## Tutorials/StackingFaults-I/Stacking Faults-I.htm

 r3081 Simulations  I

A video version of this tutorial is available at https://anl.box.com/v/StackingFaults-I

In this exercise you will use GSAS-II to simulate the diffraction patterns from faulted diamond. Diamond most commonly has the

You can explore the result of various stacking sequences in the next block of commands; enter 1 1 1 1 2 2 2 into the box and press Enter. 1 1 1 2 2 2 into the box (remember to include spaces in between each number) and press Enter. A plot showing the result of a single twin fault will be shown.

for the Histogram scale factor and change the Diffractometer type to Bragg-Brentano. type to Bragg-Brentano (if not already set to that). Finally, find your phase (random faults) and select it and then the Layers the powder pattern will be displayed with the result. On the plot press the + key to suppress the + marks. The plot should look like: Ive expanded the scale to show the interesting stuff around each peak.

marks. The plot should look like:

(Ive expanded the scale to show the interesting stuff around each peak.)

The blue line is a simulated observed pattern with imposed Poisson noise, the red line is the calculated background and the green curve is as layer 2 to layer 2 at each step in the simulation. We can force this by selecting Symmetric probabilities? on the Layers page. Do this probabilities? on the Layers tab. Do this and repeat the sequential simulation as above. Now the matrices are symmetric as one could expect. When the simulation is finished, select the Edit range from the data window. Dont change anything, just press Ok; this will clear the previous simulation. Then return to the clustered phase this will clear the previous simulation. Then return to the random faults phase Layers tab. Do Operations/Simulate pattern and press Ok

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