<div dir="ltr"><div><div><div><br>Dear experts,<br><br> I am interested in calculation of elastic constants of Zr using a supercell of 2*2*2. I created this supercell in VESTA, using Space group No. 194, P 63/m m c. For the unit cell structure Parameters I used:<br><br></div>0.333333 0.666667 0.25<br></div>and<br>0.666667 0.333333 0.75<br><br></div>I have input the atomic positions into the following input:<br><div><div><div><div><br>&control<br> calculation = 'scf'<br> restart_mode='from_scratch',<br> prefix='zr',<br> tstress = .true., <br> tprnfor = .true.,<br> pseudo_dir = '/home/krishna/QE/qe-6.2/pseudo/',<br> outdir='/home/krishna/QE/qe-6.2/tempdir/'<br> /<br> &system<br> ibrav= 4, <br> celldm(1) =12.241645, <br> celldm(3) = 1.59185, <br> nat= 16, <br> ntyp= 1,<br> ecutwfc=50.0,<br> ecutrho = 430,<br> occupations='smearing', <br> smearing='marzari-vanderbilt', <br> degauss=0.02<br> starting_magnetization(1) = 0.7, <br> /<br> &electrons<br> conv_thr = 1.0d-12<br> /<br>ATOMIC_SPECIES<br> Zr 91.22 Zr.pz-spn-kjpaw_psl.1.0.0.UPF<br>ATOMIC_POSITIONS (angstrom)<br>Zr 0.000000 1.870038 1.289000<br>Zr 3.239000 3.740075 9.023001<br>Zr 1.619500 4.675094 1.289000<br>Zr 1.619500 0.935019 9.023001<br>Zr -1.619500 4.675094 1.289000<br>Zr 4.858500 0.935019 9.023001<br>Zr 3.239000 3.740075 3.867000<br>Zr 1.619500 0.935019 3.867000<br>Zr 4.858500 0.935019 3.867000<br>Zr 0.000000 1.870038 6.445000<br>Zr 1.619500 4.675094 6.445000<br>Zr -1.619500 4.675094 6.445000<br>Zr 3.239000 1.870038 1.289000<br>Zr 0.000000 3.740075 9.023001<br>Zr 0.000000 3.740075 3.867000<br>Zr 3.239000 1.870038 6.445000<br>K_POINTS AUTOMATIC<br>5 5 3 0 0 0 <br><br></div><div>However, in out.1_0, in notice that <br><br>Space group nymber 164<br><br></div><div>Is it an error, because I generated the supercell using space group number 194?<br><br></div><div> If it is an error can you please let me know, how to modify the input?<br><br></div><div>However, when I ran the program with an unit cell of two atoms the space group number was rightly identified as 194.<br><br></div><div>Thanks,<br></div><div>Best regards,<br></div><div>Krish<br clear="all"></div><div><br>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div>Dr. Krishnendu Mukherjee,</div></div><div><br></div><div>Principal Scientist,</div><div>CSIR-NML,</div><div>Jamshedpur.</div></div></div></div></div></div></div></div></div>
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