<div dir="ltr"><div>I tried the way you suggested, tried replacing "relax" by "scf", however , I still face the same issue: No convergence even after 100 iterations. Following is the input file:<br></div><div><br></div><div>PS: I want to calculate isolated energy of CaO using example05/PW (i.e Martyna-Tuckerman) method.<br></div><div>#!/bin/sh<br><br>for a in 30<br>do<br><br>cat > ${a}.in << EOF<br>&CONTROL<br> calculation = 'relax'<br> prefix = "${a}",<br> pseudo_dir = "/home/userpooja/pv/cohesive/pseudo/",<br> outdir = "/home/userpooja/pv/cohesive/",<br>/<br>&SYSTEM<br> ibrav = 1,<br> celldm(1) = $a,<br> nat = 2,<br> ntyp = 2,<br> ecutwfc = 100.D0,<br> nbnd = 8<br> assume_isolated = 'martyna-tuckerman'<br>/<br>&ELECTRONS<br> conv_thr = 1.D-8,<br> mixing_beta = 0.7D0,<br> startingwfc = 'random'<br>/<br>&IONS<br>/<br>ATOMIC_SPECIES<br>Ca 40.078 Ca.pbe-nsp-van.UPF<br>O 15.999 O.pbe-van_ak.UPF<br>ATOMIC_POSITIONS <br>Ca 0.0 0.0 0.0<br>O 0.5 0.5 0.5<br>K_POINTS Gamma<br><br>EOF<br><br>mpirun -np 40 -machinefile x1 /apps/codes/qe/6.4/bin/pw.x < ${a}.in > ${a}.out<br>done</div><div><br></div><div>Any kind of help is appreciated.</div><div>Thanks and Regards.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jun 26, 2020 at 11:58 AM Pietro Delugas <<a href="mailto:pdelugas@sissa.it">pdelugas@sissa.it</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 lang="EN-US"><div class="gmail-m_-704748173674001904WordSection1"><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt">Hello <u></u><u></u></span></span></p><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt">In ATOMIC_POSITIONS you need to specify the units that you are using for the coordinates, if you don’t put anything he program assumes alat units and puts the 2 atoms very far apart. <u></u><u></u></span></span></p><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt">If you actually wanted compute the two separated atoms specifying startingwfc=’random’ in the &electrons name list may help. In this case I would also chose calculation=’scf’ in &control. <u></u><u></u></span></span></p><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt">Regards - Pietro <u></u><u></u></span></span></p><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p><p class="MsoNormal">Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986" target="_blank">Mail</a> for Windows 10</p><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p><div style="border-color:rgb(225,225,225) currentcolor currentcolor;border-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"><p class="MsoNormal" style="border:medium none;padding:0in"><b>From: </b><a href="mailto:poojavyas595@gmail.com" target="_blank">Pooja Vyas</a><br><b>Sent: </b>Friday, June 26, 2020 8:12 AM<br><b>To: </b><a href="mailto:users@lists.quantum-espresso.org" target="_blank">Quantum ESPRESSO users Forum</a><br><b>Subject: </b>[QE-users] Energy of isolated atom of CaO</p></div><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p><div><div><p class="MsoNormal">Dear users,</p></div><div><p class="MsoNormal">I want to calculate cohesive energy of CaO. I'm using cluster_example/PW which uses assume_isolated = 'martyna_tuckerman' . Following is my input script:</p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">#!/bin/sh<br>for a in 30<br>do<br>cat > ${a}.in << EOF<br>&CONTROL<br> calculation = 'relax'<br> prefix = "${a}",<br> pseudo_dir = "/home/user/pv/cohesive/pseudo/",<br> outdir = "/home/user/pv/cohesive/",<br>/<br>&SYSTEM<br> ibrav = 1,<br> celldm(1) = $a,<br> nat = 2,<br> ntyp = 2,<br> ecutwfc = 100.D0,<br> assume_isolated = 'martyna-tuckerman'<br>/<br>&ELECTRONS<br> conv_thr = 1.D-8,<br> mixing_beta = 0.7D0,<br>/<br>&IONS<br>/<br>ATOMIC_SPECIES<br>Ca 40.078 Ca.pbe-nsp-van.UPF<br>O 15.999 O.pbe-van_ak.UPF<br>ATOMIC_POSITIONS <br>Ca 0.0 0.0 0.0<br>O 0.5 0.5 0.5<br>K_POINTS Gamma<br><br>EOF<br><br>mpirun -np 40 -machinefile x1 /apps/codes/qe/6.4/bin/pw.x < ${a}.in > ${a}.out<br>done<br>done</p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">My lattice constant is around 8 a.u , so I assumed the box size to be 3 times of it. But when I run the script, the convergence was not achieved even after 100 iterations. Then I tried to take small box size of about 16 bohr. That too didn't work. Then I even tried reducing ecutwfc and mixing_beta..but same error was obtained. Can anyone suggest what can I do to resolve the issue?</p></div><div><p class="MsoNormal">Any kind of help is appreciated.</p></div></div><p class="MsoNormal">Thanks and regards.</p><p class="MsoNormal"><span class="gmail-m_-704748173674001904DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p></div></div>_______________________________________________<br>
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