<div dir="ltr">You're selecting, through ibrav = 2, cubic F (fcc) lattice with lattice constant a = 4.3988580704 A.<br>As the error, quite clearly shows, is with atoms 1 and 2 (of course similar errors may show up for the other atoms),<div>let us consider the positions in input:</div><div>Fe 0.000000 0.000000 0.000000<br>Fe 0.000000 2.199429 2.199429 -> 0 a/2 a/2<br><br>So, atoms 1 and 2 differ by the vector (0,a/2,a/2) that is a Bravais lattice translation of cubic fcc. This means that in the input there are</div><div>atoms that are equivalent for periodicity.</div><div><br></div><div>What you should do depends on what you would do. Either you're adding atoms that are not needed in the input or you are trying to build a supercell</div><div>and you have forgotten to change the lattice parameter accordingly.</div><div><br></div><div>The number of atoms depends on which system you want to simulate.</div><div><br></div><div>Giovanni<br><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><span style="color:rgb(0,0,0)">-- <br><br>Giovanni Cantele, PhD<br>CNR-SPIN<br>c/o Dipartimento di Fisica<br>Universita' di Napoli "Federico II"<br>Complesso Universitario M. S. Angelo - Ed. 6<br>Via Cintia, I-80126, Napoli, Italy<br><a href="mailto:giovanni.cantele@spin.cnr.it" style="color:rgb(17,85,204)" target="_blank">e-mail: giovanni.cantele@spin.cnr.it</a><br>Phone: +39 081 676910<br>Skype contact: giocan74<br><br>ResearcherID: <a href="http://www.researcherid.com/rid/A-1951-2009" style="color:rgb(17,85,204)" target="_blank">http://www.researcherid.com/rid/A-1951-2009</a><br>Web page: </span><a href="https://sites.google.com/view/giovanni-cantele/home" style="color:rgb(17,85,204)" target="_blank">https://sites.google.com/view/giovanni-cantele/home</a><br></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il giorno mer 15 mag 2024 alle ore 13:28 VISHVA JEET ANAND via users <<a href="mailto:users@lists.quantum-espresso.org">users@lists.quantum-espresso.org</a>> ha scritto:<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 dir="ltr"><div dir="ltr">Dear Users<div>I try to relax the FeO unit cell but I face a problem that is attached here in the output file and I also attached the input file.</div><div>In the input file are no. of atoms right with ibrav value? In input i am using angstrom atomic position exactly at the same position as crystal. Please help to resolve this problem.<br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr">With Regards<div>Vishva Jeet Anand</div><div>Research Scholar</div><div>Department of Chemistry <br><div><br></div></div></div></div></div></div></div>
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