Dear mohnish pandey,<br><br>for convergene tests in bulk, both "relax"(for atomic coordinates) and <br>"vc-relax"(for lattice parameters with some what high values of ecutwfc<br> and kpts than converged values)) options have to be used. please correct me <br>
if i am wrong?<br><br><br>
! Are you sure you are relaxing the bulk system for<br>
! convergence test? For convergence test you have to <b>vc-relax calculation</b> not<br>
! 'scf'. 'SCF' calculation will not convergence stress and forces in the<br>
! system so your energy will show the behavior that you are getting and by the!<br>
! way as Dr. Lorenzo said you should specify the type of pseudopotential you<br>
! are using. And mention you affiliation also not only phone numbers ;)<br clear="all"><br>-- <br>Sonu Kumar<br><br>Phd Student<br>Physics Department<br>Indian Institute of Technology <br>Delhi-110016, India<br>web:-<a href="http://www.iitd.ac.in/">http://www.iitd.ac.in/</a><br>