<div dir="ltr">Hi Benyahia,<div><br></div><div>1. I think your cut-offs are too small</div><div> ecutrho = 7.20000e+02<br> ecutwfc = 1.00000e+01 </div><div>You can start with some recommended values from the pseudopotentials.<br></div><div><br></div><div>2. "P=**********" indicates your pressure is out of limit to print. It looks like you are using unit-cell lattice parameters (a = 3.60) and super-cell atomic positions (nat = 32). </div><div><br></div><div>I hope this helps,</div><div><br></div><div>Best,</div><div>Hari Paudyal</div><div>SUNY, Binghamton University</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jun 19, 2020 at 9:52 AM BENYAHIA NEZHA <<a href="mailto:BENYAHIA-NEZHA@hotmail.fr">BENYAHIA-NEZHA@hotmail.fr</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">Dear QE users,<br>
<br>
i have created a supercell of GaN-ZnO and i've tried to optimise it using the input file attached below. however i receive in the output file a pressure of P=********** and the convergence has been achieved. i used PAW pseudopotential.<br>
<br>
I would be very grateful if somebody helps or give suggestions.<br>
<br>
<br>
&CONTROL<br>
calculation = "relax"<br>
etot_conv_thr = 1.00000e-04<br>
forc_conv_thr = 1.00000e-05<br>
outdir = "./tmp/"<br>
prefix = "GaN-ZnO4h"<br>
pseudo_dir = "../pseudo"<br>
restart_mode = "from_scratch"<br>
tprnfor = .TRUE.<br>
tstress = .TRUE.<br>
/<br>
<br>
&SYSTEM<br>
a = 3.60 <br>
c = 40<br>
ecutrho = 7.20000e+02<br>
ecutwfc = 1.00000e+01<br>
ibrav = 4<br>
nat = 32<br>
ntyp = 4<br>
occupations = "smearing"<br>
smearing = "gaussian"<br>
degauss =0.02,<br>
/<br>
<br>
&ELECTRONS<br>
conv_thr = 1.00000e-07<br>
diagonalization = "david"<br>
mixing_beta = 3.00000e-01<br>
/<br>
<br>
&IONS<br>
ion_dynamics = "bfgs"<br>
/<br>
<br>
&CELL<br>
/<br>
<br>
K_POINTS {automatic}<br>
4 4 1 0 0 0<br>
<br>
ATOMIC_SPECIES<br>
Ga 69.72300 Ga.pz.UPF<br>
N 14.00680 N.pz.UPF<br>
Zn 65.39000 Zn.pz.UPF<br>
O 15.99940 O.pz.UPF<br>
<br>
ATOMIC_POSITIONS {crystal}<br>
Ga 0.000000 0.000000 0.000000<br>
Ga 0.666668 0.333334 0.125000<br>
Ga 0.333334 0.666668 0.187500<br>
Ga 0.333334 0.666668 0.062500<br>
N 0.000000 0.000000 0.046875<br>
N 0.666668 0.333334 0.171875<br>
N 0.333334 0.666668 0.234375<br>
N 0.333334 0.666668 0.109375<br>
Ga 0.000000 0.000000 0.250000<br>
Ga 0.666668 0.333334 0.375000<br>
Ga 0.333334 0.666668 0.437500<br>
Ga 0.333334 0.666668 0.312500<br>
N 0.000000 0.000000 0.296875<br>
N 0.666668 0.333334 0.421875<br>
N 0.333334 0.666668 0.484375<br>
N 0.333334 0.666668 0.359375<br>
Zn 0.000000 0.000000 0.500000<br>
Zn 0.666668 0.333334 0.625000<br>
Zn 0.333334 0.666668 0.687500<br>
Zn 0.333334 0.666668 0.562500<br>
O 0.000000 0.000000 0.546875<br>
O 0.666668 0.333334 0.671875<br>
O 0.333334 0.666668 0.734375<br>
O 0.333334 0.666668 0.609375<br>
Zn 0.000000 0.000000 0.750000<br>
Zn 0.666668 0.333334 0.875000<br>
Zn 0.333334 0.666668 0.937500<br>
Zn 0.333334 0.666668 0.812500<br>
O 0.000000 0.000000 0.796875<br>
O 0.666668 0.333334 0.921875<br>
O 0.333334 0.666668 0.984375<br>
O 0.333334 0.666668 0.859375<br>
<br>
<br>
BENYAHIA NEZHA<br>
PhD Student in Materials Science<br>
LPMF-USTO <br>
Algeria<br>
<br>
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</blockquote></div>