<div dir="ltr"><div dir="ltr"><br>Dear SUNIL,<div>convergence issues are often related to the BAD CHOICE of ecutcfc and/Or K_POINTS. I suggest you increase ecutwfc it seems too small and for ecutrho let it be around ecutwfc* 8~12 since you use ultrasoft pseudopotential. Also, increase K-POINTS try 4*4*3. another remarque is that since ibrav=4, a and c seems to be bad description of cell parameters try to use celldm(1) (in bohr) and celldm(3) instead (read pw.x input description)<br>I hope this solves the problem <br>best wishes.<br>Abdelhamid<br><br><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le mar. 2 févr. 2021 à 10:55, Dr. SUNIL KUMAR <<a href="mailto:suniliitd14@gmail.com">suniliitd14@gmail.com</a>> a écrit :<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>Dear Developers and users of QE.</div><div>I am struggling to optimize the structure of strontium hexaferrite durin relax calculation of DFT using QE as given in the following script and attached snapshot. It is taking too much time and send some unexpected error as </div><div><br></div><div> convergence NOT achieved after 100 iterations: stoppingv<br></div><div>or</div><div> convergence NOT achieved after 200 iterations: stopping<br></div><div><br></div><div>Can anyone suggest me any modification in the following script.</div><div>I will be too much grateful.</div><div>Thanks</div><div>With regards</div><div>SUNIL</div><div><br></div>&CONTROL<br> calculation = "relax"<br> prefix = "espresso"<br> tprnfor = .TRUE.<br> tstress = .TRUE.<br> wf_collect = .TRUE.<br> verbosity = 'high'<br> disk_io = 'high'<br> forc_conv_thr = 1.00000e-03<br> nstep = 200<br> pseudo_dir = "/home/pseudopot"<br> outdir = "./outdir"<br> wfcdir = "./wfcdir"<br>/<br><br>&SYSTEM<br> a = 5.99774e+00<br> c = 2.33482e+01<br> degauss = 1.00000e-02<br> ecutrho = 250<br> ecutwfc = 25<br> ibrav = 4<br> nat = 64<br> nspin = 2<br> ntyp = 3<br> occupations = "smearing"<br> smearing = "gaussian"<br> starting_magnetization(1) = 0.00000e+00<br> starting_magnetization(2) = 0.2<br> starting_magnetization(3) = 0.00000e+00<br> lda_plus_u = .true.<br> lda_plus_u_kind = 0<br> Hubbard_U(2) = 4<br> Hubbard_J(1,1) = 0<br> Hubbard_J(2,2) = 1<br><br>/<br><br>&ELECTRONS<br> conv_thr = 1.00000e-06<br> electron_maxstep = 500<br> mixing_beta = 4.00000e-01<br> startingpot = "atomic"<br> startingwfc = "atomic+random"<br><br>/<br><br>&IONS<br> ion_dynamics = "bfgs"<br>/<br><br>&CELL<br>/<br><br><br>K_POINTS {automatic}<br> 3 3 1 0 0 0<br><br>ATOMIC_SPECIES<br>Sr 87.62000 Sr.pbe-nsp-van.UPF<br>Fe 55.84500 Fe.pbe-nd-rrkjus.UPF<br>O 15.99940 O.pbe-rrkjus.UPF<br><br>ATOMIC_POSITIONS {angstrom}<br>Sr -0.000000 3.462796 17.511161<br>Sr 2.998869 1.731398 5.837054<br>Fe 0.000000 0.000000 0.000000<br>Fe 0.000000 0.000000 11.674107<br>Fe 0.000000 0.000000 17.511161<br>Fe 0.000000 0.000000 5.837054<br>Fe 2.998869 1.731398 22.706489<br>Fe -0.000000 3.462796 0.641726<br>Fe -0.000000 3.462796 11.032382<br>Fe 2.998869 1.731398 12.315833<br>Fe 2.998869 1.731398 18.887702<br>Fe -0.000000 3.462796 4.460513<br>Fe -0.000000 3.462796 7.213594<br>Fe 2.998869 1.731398 16.134621<br>Fe 2.998869 3.447345 2.560692<br>Fe 1.512816 0.873424 2.560692<br>Fe 4.484923 0.873424 2.560692<br>Fe 0.000000 1.746849 20.787523<br>Fe 1.486054 4.320769 20.787523<br>Fe -1.486054 4.320769 20.787523<br>Fe 0.000000 1.746849 14.234800<br>Fe 1.486054 4.320769 14.234800<br>Fe -1.486054 4.320769 14.234800<br>Fe 2.998869 3.447345 9.113415<br>Fe 1.512816 0.873424 9.113415<br>Fe 4.484923 0.873424 9.113415<br>O 0.000000 0.000000 19.782055<br>O 0.000000 0.000000 3.566160<br>O 0.000000 0.000000 8.107948<br>O 0.000000 0.000000 15.240267<br>O 2.998869 1.731398 1.300869<br>O -0.000000 3.462796 22.047346<br>O -0.000000 3.462796 12.974977<br>O 2.998869 1.731398 10.373238<br>O 2.998869 3.294521 17.511161<br>O 1.645165 0.949836 17.511161<br>O 4.352574 0.949836 17.511161<br>O 0.000000 1.899672 5.837054<br>O 1.353705 4.244357 5.837054<br>O -1.353705 4.244357 5.837054<br>O 2.998869 3.580534 22.111857<br>O 1.397470 0.806830 22.111857<br>O 4.600268 0.806830 22.111857<br>O 0.000000 1.613659 1.236358<br>O 1.601399 4.387364 1.236358<br>O -1.601399 4.387364 1.236358<br>O 0.000000 1.613659 10.437749<br>O 1.601399 4.387364 10.437749<br>O -1.601399 4.387364 10.437749<br>O 2.998869 3.580534 12.910466<br>O 1.397470 0.806830 12.910466<br>O 4.600268 0.806830 12.910466<br>O 0.000000 5.134086 19.813669<br>O -1.447380 2.627150 19.813669<br>O 1.447380 2.627150 19.813669<br>O 2.998869 0.060107 3.534546<br>O 4.446249 2.567043 3.534546<br>O 1.551489 2.567043 3.534546<br>O 2.998869 0.060107 8.139561<br>O 4.446249 2.567043 8.139561<br>O 1.551489 2.567043 8.139561<br>O 0.000000 5.134086 15.208654<br>O -1.447380 2.627150 15.208654<br>O 1.447380 2.627150 15.208654<br><br><br><div><div dir="ltr"><div dir="ltr">Dr. Sunil Kumar<div>Ph.D (Chemical Engg. IIT Delhi)</div><div><span style="font-size:12.8px">M.Tech (Chemical Engg. IIT Delhi)</span><br></div><div><span style="font-size:12.8px">B.Tech (Chemical Engg. IET-CSJMU Kanpur)</span></div><div><span style="font-size:12.8px">Scientist-C and Assistant Professor</span></div><div>CSIR-National Metallurgical Laboratory Jamshedpur-831007</div><div><a href="http://www.nmlindia.org/" target="_blank">http://www.nmlindia.org/</a><br></div><div><a href="https://scholar.google.co.in/citations?user=OchYqugAAAAJ&hl=en&oi=sra" target="_blank">https://scholar.google.co.in/citations?user=OchYqugAAAAJ&hl=en&oi=sra</a><br></div><div><br></div></div></div></div></div>
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