<div dir="ltr">Dear all,<div><br></div><div>I have a question regarding constructing supercells in QE and performing vc-relax. Based on recommendations available on pwscf website, I used xcrysden to generate a rather large cell (consisting 125 atoms of vanadium, available in attached file). But, when I modify my input script and again visualize the structure, "translational asymmetric cell" view shows a very strange configuration of atoms. Also, performing vc-relax takes incredibly long time (about 6 days on 64-cores). </div><div>Is there something wrong with my method? Is this a correct super cell?</div><div>I use QE5.4.0 compiled with ifort.<br></div><div>---------------------------------------------------------------------------------------------------------------------</div><div>Method:</div><div><br></div><div>1- Constructing a simple bcc unit cell (~ in1.txt)</div><div>2- Visualizing using xcrysden, changing to primitive cell mode, repeating cell in x,y and z-direction (5x5x5) and saving configuration (~ <a href="http://data.xyz">data.xyz</a>)</div><div>3- Extracting atomic positions from saved configuration and modifying the input script (in2.txt)</div><div><br></div><div>Thank you very much for your response.</div><div><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div style="font-family:arial;font-size:small"><font size="1">With Best Regards</font></div><div style="font-family:arial;font-size:small"><font size="1">Afshin Arjhangemehr</font></div><div style="font-family:arial;font-size:small"><font size="1">PhD candidate in Radiation Application</font></div><div style="font-family:arial;font-size:small"><font size="1">Shahid Beheshti University G.C, Tehran, IRAN</font></div><div style="font-family:arial;font-size:small"><font size="1">(+98) 912 439 20 64</font></div></div></div></div></div>
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