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<p>Hi, </p>
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<p>This is Huang Liu from the University of Utah. I am trying to use GSAS 2 to do refinement on my data.</p>
<p><span style="font-size: 12pt;">1.</span><span style="font-size: 12pt;"> </span><span style="font-size: 12pt;">I try to get the instrument parameters according to the tutorial</span></p>
<p><span style="font-size: 12pt;"> (</span><a href="https://subversion.xray.aps.anl.gov/pyGSAS/Tutorials/CWInstDemo/FindProfParamCW.htm" class="OWAAutoLink" id="LPlnk164859" previewremoved="true" style="font-size: 12pt;">https://subversion.xray.aps.anl.gov/pyGSAS/Tutorials/CWInstDemo/FindProfParamCW.htm</a><span style="font-size: 12pt;">)</span><span style="font-size: 12pt;">. </span></p>
<p><span style="font-size: 12pt;">But the U parameters that I get are always negative, and the Rwp is above 10</span><span style="font-size: 12pt;">. I am using the data generated by
</span><b style="font-size: 12pt;">Rigaku mini flex 600 </b><span style="font-size: 12pt;">by
</span><b style="font-size: 12pt;">using SRM Si 640d</b><span style="font-size: 12pt;"> as a standard sample for generating instrument profile parameters.</span><span style="font-size: 12pt;"> The attached file (Si-640d) is the original data. </span><br>
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<p>Could you please help me generate the instrument profile? Thank you very much.</p>
<p>2. I try to import Ti2Fe4O phase into the GSAS2, but I failed.</p>
<p>Since this is the third phase that I want to import. May I ask is there a phase quantities limit of import? </p>
<p>If not, is there anything wrong with my CIF file (I downloaded it from the COD website?</p>
<p>Attached is the <span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">Ti2Fe4O cif card downloaded from COD website.</span></p>
<p>I would be very grateful if you can help me. Looking forward to your reply.</p>
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<p>Best regards,</p>
<p>Huang Liu</p>
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