<div dir="ltr"><br class="gmail-Apple-interchange-newline"><font face="times new roman, serif">Dear Chandrika</font><div><font face="times new roman, serif">You cannot change ibrav without changing the atom positions. <span style="color:rgb(13,13,13)">To change the structure from simple cubic to face-centered cubic (FCC), you need to make sure that the atomic positions are arranged in a manner consistent with the FCC crystal structure. The FCC structure has atoms located at the corners of the unit cell as well as at the centers of each face.</span></font></div><div><br></div><div><p><font face="times new roman, serif">Best regards,</font></p><p><font face="times new roman, serif">K. Ramesh Kumar</font></p><p><font face="times new roman, serif"> Assistant Professor </font></p><p><font face="times new roman, serif">Gandhi Institute of Technology and Management, </font></p><p><font face="times new roman, serif"> Phone: +91 9895637981, +1 6782419790 </font></p><p><font face="times new roman, serif">Email: <a href="mailto:kraamesh57@gmail.com" target="_blank">kraamesh57@gmail.com</a> <a href="mailto:rkamadur@gitam.edu" target="_blank">rkamadur@gitam.edu</a></font></p></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 27, 2024 at 3:45 PM Ms. Chandrika K. via users <<a href="mailto:users@lists.quantum-espresso.org" target="_blank">users@lists.quantum-espresso.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
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<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">Need help in understanding </span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">I am currently working on Co3O4 structure,from literature it is very evident that it belongs to space group Fd3m(cubic
fcc).</span></li><li style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<div style="margin:0px"><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">I have referred to Co3O4 Fd3m cubic structure from materials project
it is represented as simple cubic structure but Fd3m space group refers to cubic fcc.</span></div>
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<div style="margin:0px"><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">As it is simple cubic ibrav =1,when i change ibrav =2(cubic fcc)
i am getting warning message </span></div>
<div style="margin:0px"><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">"WARNING: Atom 381 and atom 444 are very close !!! Atom 444 deleted
!!!"</span></div>
<div style="margin:0px"><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">ATOMIC_POSITIONS (angstrom)</span></div>
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I would like to know how to change the structure from simple cubic to fcc cubic</div>
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chandrika yadav k </div>
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