<div dir="ltr"><div><div><div><div><div><div><div>Dear Maseen<br></div>if you have this lattice vectors <br><br>CELL_PARAMETERS {angstrom}<br> 4.9363447999999996 0.0000000000000000 0.0000000000000000<br> 2.4681723999999998 4.2750000000000004 0.0000000000000000<br> 0.0000000000000000 0.0000000000000000 12.0000000000000000<br><br></div>why do you put the one atom in 6.593779744 3.831146919 0.900942199 and other in <br>4.125469394 3.831006729 0.901201599</div>and... Ni is a FCC compound, so if you have 3 layers of Ni(111), you must to have groups of 4 atoms with the same z value. Please check your input file.<br><br></div>Best<br><br></div>PhD. Arles V. Gil Rebaza<br></div>Intituto de Física La Plata<br></div>La Plata-Argentina<br><div><div><div><div><div><br><br><div><div><br></div></div></div></div></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-07-06 2:19 GMT-03:00 Naseem Hassan <span dir="ltr"><<a href="mailto:raheskoon@gmail.com" target="_blank">raheskoon@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div><div>Dear Members,<br><br></div>I took a 3-layer Ni-111 surface structure and checked it via xcrysden and chemcraft. The structure is fine and also my friend is using same structure in VASAP without any problem. But when I run the relaxation for this system in QE 5.1. The structure starts spreading/collapsing. I tried other ways but not sure why this structure is not stable in QE during relaxation.<br><br></div>Kindly provide some input for overcoming this problem. The input file is shown Below.<br><br></div>Thank You<br></div>Naseem Hassan<br></div>Universiti Tecknologi Malaysia <br><br> &control<br> calculation='relax'<br> restart_mode='from_scratch'<br> pseudo_dir = '/share/QE_pseudo'<br> outdir='./'<br> prefix='Graphane'<br> forc_conv_thr=1.0D-4<br>! dt = 20<br>! tefield = .true.<br> nstep=3000<br>/<br> &system<br> ibrav= 0<br> nat= 12, ntyp= 1<br> ecutwfc =60.0<br> occupations='smearing'<br> degauss=0.002<br> /<br> &electrons<br>! conv_thr=1.0D-8<br> mixing_mode='plain'<br> scf_must_converge=.false.<br>! electron_maxstep=400<br> /<br>&ions<br> ion_dynamics = 'damp'<br>/<br>CELL_PARAMETERS {angstrom}<br> 4.9363447999999996 0.0000000000000000 0.0000000000000000<br> 2.4681723999999998 4.2750000000000004 0.0000000000000000<br> 0.0000000000000000 0.0000000000000000 12.0000000000000000<br>ATOMIC_SPECIES<br> Ni 58.6934 Ni.pbe-mt_fhi.UPF<br>ATOMIC_POSITIONS {angstrom}<br>Ni 6.593779744 3.831146919 0.900942199<br>Ni 2.878171463 0.325256336 2.566767175<br>Ni 4.149708943 1.089021759 4.449272572<br>Ni 4.125469394 3.831006729 0.901201599<br>Ni 0.410161483 0.325286326 2.566708045<br>Ni 1.681648933 1.089091799 4.448872032<br>Ni 5.359329404 1.693546849 0.901062359<br>Ni 4.112411513 2.462676226 2.566528755<br>Ni 5.383949003 3.226741749 4.449081832<br>Ni 2.891459644 1.693646869 0.901031849<br>Ni 1.644121543 2.462456406 2.566627935<br>Ni 2.915678933 3.226781799 4.448881562<br>K_POINTS {automatic}<br> 3 3 1 0 0 0<br><br></div>
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