<DIV>dear Polo,</DIV>
<DIV> I met a problem when I was doing structure optim of beta-phase AgI. The space group is P63MC which has 12 symmitry operations. The atoms positions are</DIV>
<DIV> Ag 0.3333, 0.6667, 0.000</DIV>
<DIV> Ag 0.6667, 0.3333, 0.500</DIV>
<DIV> I 0.3333, 0.6667, 0.3345</DIV>
<DIV> I 0.6667, 0.3333, 0.8345</DIV>
<DIV> I first do the scf.</DIV>
<DIV> In agi.scf.out , there is only 2 symmitry operations, and the total force is 514.926. </DIV>
<DIV> And P=*********</DIV>
<DIV>26318.28 -19.20 -0.01</DIV>
<DIV>-19.20 26296.11 0.00 </DIV>
<DIV> -0.01 0.00 556494 <BR></DIV>
<DIV>My questions are that why the total force and P is so large and why the pwscf can't find 12 symmitry operations.<BR></DIV>
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