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It seems that van der Waals (vdW) interactions might be necessary for describing the relaxed structure of this low-dimensional system (as also implicitly suggested by "prefix='vdw'" in the input file). However, the input file suggests that PBEsol is used without
 a particular vdW correction (see <a href="https://www.quantum-espresso.org/Doc/INPUT_PW.html#idm621" title="https://www.quantum-espresso.org/Doc/INPUT_PW.html#idm621">
vdw_corr</a>). Perhaps, it is the lack of this relevant non-covalent interaction that leads to difficulty in the convergence.<br>
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Best,</div>
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Hsin-Yu<br>
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<font color="#888888">--
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<div><span style="font-family:georgia,serif"><span style="color:rgb(102,102,102)">Hsin-Yu Ko</span></span></div>
<div><span style="font-family:georgia,serif"><span style="color:rgb(102,102,102)">Postdoctoral Research Fellow<br>
</span></span></div>
<span style="font-family:georgia,serif"><span style="color:rgb(102,102,102)">Department of Chemistry and Chemical Biology<br>
</span></span><span><span style="font-family:georgia,serif"><span style="color:rgb(102,102,102)">Cornell University</span></span></span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> users <users-bounces@lists.quantum-espresso.org> on behalf of Giovanni Cantele <giovanni.cantele@spin.cnr.it><br>
<b>Sent:</b> Wednesday, July 20, 2022 5:57 AM<br>
<b>To:</b> Quantum ESPRESSO users Forum <users@lists.quantum-espresso.org><br>
<b>Subject:</b> Re: [QE-users] relax : convergence NOT achieved after 80 iterations: stopping</font>
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<div dir="ltr">One thing to do is to open your structure with any program capable to process the QE input, e.g. XCrysDen. Attached, you can find a screenshot. I'm not sure that this is the structure you expect to simulate and, mostly, that this is a structure
 that would easily reach convergence to the ground state.
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<div>Giovanni</div>
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<div dir="ltr" class="x_gmail_attr">Il giorno mer 20 lug 2022 alle ore 08:51 Liang Yihao <<a href="mailto:u3586685@connect.hku.hk">u3586685@connect.hku.hk</a>> ha scritto:<br>
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<div dir="ltr">I was doing a relax calculation for double-layer supercell of Si and MoS2.  Given below is my input script. The output file says convergence NOT achieved after 80 iterations. Since the system is double-layer and mixing_beta = 4.0000000000d-01.
 Still the output file says not converged. What could be the problem ?
<div><br>
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<div><br>
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<div>&CONTROL</div>
<div>  calculation = 'relax'</div>
<div>  etot_conv_thr =   1.1200000000d-03</div>
<div>  forc_conv_thr =   1.0000000000d-04</div>
<div>  outdir = './out/'</div>
<div>  prefix = 'vdw'</div>
<div>  pseudo_dir = './pseudo/'</div>
<div>  tprnfor = .true.</div>
<div>  tstress = .true.</div>
<div>  verbosity = 'high'</div>
<div>/</div>
<div>&SYSTEM</div>
<div>  degauss =   1.4699723600d-02</div>
<div>  ecutrho =   2.8000000000d+02</div>
<div>  ecutwfc =   3.5000000000d+01</div>
<div>  ibrav = 0</div>
<div>  nat = 112</div>
<div>  nosym = .false.</div>
<div>  ntyp = 3</div>
<div>  occupations = 'smearing'</div>
<div>  smearing = 'cold'</div>
<div>/</div>
<div>&ELECTRONS</div>
<div>  conv_thr =   2.2400000000d-08</div>
<div>  electron_maxstep = 80</div>
<div>  mixing_beta =   4.0000000000d-01</div>
<div>/</div>
<div>&IONS</div>
<div>/</div>
<div>ATOMIC_SPECIES</div>
<div>Mo     95.96 Mo_ONCV_PBEsol-1.0.upf</div>
<div>S      32.065 s_pbesol_v1.4.uspp.F.UPF</div>
<div>Si     28.0855 Si.pbesol-n-rrkjus_psl.1.0.0.UPF</div>
<div>ATOMIC_POSITIONS crystal</div>
<div>Si           0.0000000000       0.0000000000       0.3979700000</div>
<div>Si           0.1250000000       0.1250000000       0.2229200000</div>
<div>Si           0.1250000000       0.0000000000       0.3104500000</div>
<div>Si           0.0000000000       0.1250000000       0.1354000000</div>
<div>Si           0.2500000000       0.0000000000       0.3979700000</div>
<div>Si           0.3750000000       0.1250000000       0.2229200000</div>
<div>Si           0.3750000000       0.0000000000       0.3104500000</div>
<div>Si           0.2500000000       0.1250000000       0.1354000000</div>
<div>Si           0.5000000000       0.0000000000       0.3979700000</div>
<div>Si           0.6250000000       0.1250000000       0.2229200000</div>
<div>Si           0.6250000000       0.0000000000       0.3104500000</div>
<div>Si           0.5000000000       0.1250000000       0.1354000000</div>
<div>Si           0.7500000000       0.0000000000       0.3979700000</div>
<div>Si           0.8750000000       0.1250000000       0.2229200000</div>
<div>Si           0.8750000000       0.0000000000       0.3104500000</div>
<div>Si           0.7500000000       0.1250000000       0.1354000000</div>
<div>Si           0.0000000000       0.2500000000       0.3979700000</div>
<div>Si           0.1250000000       0.3750000000       0.2229200000</div>
<div>Si           0.1250000000       0.2500000000       0.3104500000</div>
<div>Si           0.0000000000       0.3750000000       0.1354000000</div>
<div>Si           0.2500000000       0.2500000000       0.3979700000</div>
<div>Si           0.3750000000       0.3750000000       0.2229200000</div>
<div>Si           0.3750000000       0.2500000000       0.3104500000</div>
<div>Si           0.2500000000       0.3750000000       0.1354000000</div>
<div>Si           0.5000000000       0.2500000000       0.3979700000</div>
<div>Si           0.6250000000       0.3750000000       0.2229200000</div>
<div>Si           0.6250000000       0.2500000000       0.3104500000</div>
<div>Si           0.5000000000       0.3750000000       0.1354000000</div>
<div>Si           0.7500000000       0.2500000000       0.3979700000</div>
<div>Si           0.8750000000       0.3750000000       0.2229200000</div>
<div>Si           0.8750000000       0.2500000000       0.3104500000</div>
<div>Si           0.7500000000       0.3750000000       0.1354000000</div>
<div>Si           0.0000000000       0.5000000000       0.3979700000</div>
<div>Si           0.1250000000       0.6250000000       0.2229200000</div>
<div>Si           0.1250000000       0.5000000000       0.3104500000</div>
<div>Si           0.0000000000       0.6250000000       0.1354000000</div>
<div>Si           0.2500000000       0.5000000000       0.3979700000</div>
<div>Si           0.3750000000       0.6250000000       0.2229200000</div>
<div>Si           0.3750000000       0.5000000000       0.3104500000</div>
<div>Si           0.2500000000       0.6250000000       0.1354000000</div>
<div>Si           0.5000000000       0.5000000000       0.3979700000</div>
<div>Si           0.6250000000       0.6250000000       0.2229200000</div>
<div>Si           0.6250000000       0.5000000000       0.3104500000</div>
<div>Si           0.5000000000       0.6250000000       0.1354000000</div>
<div>Si           0.7500000000       0.5000000000       0.3979700000</div>
<div>Si           0.8750000000       0.6250000000       0.2229200000</div>
<div>Si           0.8750000000       0.5000000000       0.3104500000</div>
<div>Si           0.7500000000       0.6250000000       0.1354000000</div>
<div>Si           0.0000000000       0.7500000000       0.3979700000</div>
<div>Si           0.1250000000       0.8750000000       0.2229200000</div>
<div>Si           0.1250000000       0.7500000000       0.3104500000</div>
<div>Si           0.0000000000       0.8750000000       0.1354000000</div>
<div>Si           0.2500000000       0.7500000000       0.3979700000</div>
<div>Si           0.3750000000       0.8750000000       0.2229200000</div>
<div>Si           0.3750000000       0.7500000000       0.3104500000</div>
<div>Si           0.2500000000       0.8750000000       0.1354000000</div>
<div>Si           0.5000000000       0.7500000000       0.3979700000</div>
<div>Si           0.6250000000       0.8750000000       0.2229200000</div>
<div>Si           0.6250000000       0.7500000000       0.3104500000</div>
<div>Si           0.5000000000       0.8750000000       0.1354000000</div>
<div>Si           0.7500000000       0.7500000000       0.3979700000</div>
<div>Si           0.8750000000       0.8750000000       0.2229200000</div>
<div>Si           0.8750000000       0.7500000000       0.3104500000</div>
<div>Si           0.7500000000       0.8750000000       0.1354000000</div>
<div>Mo           0.7500000000       0.0000000000       0.6494300000</div>
<div>Mo           0.2500000000       0.5000000000       0.6494300000</div>
<div>Mo           0.3750000000       0.1250000000       0.7080600000</div>
<div>Mo           0.8750000000       0.6250000000       0.7080600000</div>
<div>S            0.5645000000       0.1855000000       0.6494300000</div>
<div>S            0.0645000000       0.6855000000       0.6494300000</div>
<div>S            0.1895000000       0.3105000000       0.7080600000</div>
<div>S            0.6895000000       0.8105000000       0.7080600000</div>
<div>S            0.0605000000       0.4395000000       0.7080600000</div>
<div>S            0.5605000000       0.9395000000       0.7080600000</div>
<div>S            0.4355000000       0.3145000000       0.6494300000</div>
<div>S            0.9355000000       0.8145000000       0.6494300000</div>
<div>Mo           0.1250000000       0.3750000000       0.8253200000</div>
<div>Mo           0.6250000000       0.8750000000       0.8253200000</div>
<div>Mo           0.2500000000       0.0000000000       0.8839400000</div>
<div>Mo           0.7500000000       0.5000000000       0.8839400000</div>
<div>S            0.4395000000       0.0605000000       0.8253200000</div>
<div>S            0.9395000000       0.5605000000       0.8253200000</div>
<div>S            0.0645000000       0.1855000000       0.8839400000</div>
<div>S            0.5645000000       0.6855000000       0.8839400000</div>
<div>S            0.9355000000       0.3145000000       0.8839400000</div>
<div>S            0.4355000000       0.8145000000       0.8839400000</div>
<div>S            0.3105000000       0.1895000000       0.8253200000</div>
<div>S            0.8105000000       0.6895000000       0.8253200000</div>
<div>Mo           0.0000000000       0.2500000000       0.6494300000</div>
<div>Mo           0.5000000000       0.7500000000       0.6494300000</div>
<div>Mo           0.6250000000       0.3750000000       0.7080600000</div>
<div>Mo           0.1250000000       0.8750000000       0.7080600000</div>
<div>S            0.8145000000       0.4355000000       0.6494300000</div>
<div>S            0.3145000000       0.9355000000       0.6494300000</div>
<div>S            0.9395000000       0.0605000000       0.7080600000</div>
<div>S            0.4395000000       0.5605000000       0.7080600000</div>
<div>S            0.8105000000       0.1895000000       0.7080600000</div>
<div>S            0.3105000000       0.6895000000       0.7080600000</div>
<div>S            0.1855000000       0.0645000000       0.6494300000</div>
<div>S            0.6855000000       0.5645000000       0.6494300000</div>
<div>Mo           0.8750000000       0.1250000000       0.8253200000</div>
<div>Mo           0.3750000000       0.6250000000       0.8253200000</div>
<div>Mo           0.5000000000       0.2500000000       0.8839400000</div>
<div>Mo           0.0000000000       0.7500000000       0.8839400000</div>
<div>S            0.6895000000       0.3105000000       0.8253200000</div>
<div>S            0.1895000000       0.8105000000       0.8253200000</div>
<div>S            0.3145000000       0.4355000000       0.8839400000</div>
<div>S            0.8145000000       0.9355000000       0.8839400000</div>
<div>S            0.6855000000       0.0645000000       0.8839400000</div>
<div>S            0.1855000000       0.5645000000       0.8839400000</div>
<div>S            0.5605000000       0.4395000000       0.8253200000</div>
<div>S            0.0605000000       0.9395000000       0.8253200000</div>
<div>K_POINTS {gamma}</div>
<div><br>
</div>
<div>CELL_PARAMETERS angstrom</div>
<div>     14.5890000000       0.0000000000       0.0000000000</div>
<div>      0.0000000000      14.5890000000       0.0000000000</div>
      0.0000000000       0.0000000000      15.5098000000
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