[Pw_forum] convergence for lattice parameter

2012-04-08 Thread Giovani Faccin
Dear Ayedun, Try using a higher ecutwfc, like 50 for example. Also a smaller degauss value. Finally set the ecutrho to 4*ecutwfc if your pseudopotential is not US, and to 12*ecutwfc if it is. It`s also a good idea to specify the number of bands, to make sure you got enough ones on the calculation

[Pw_forum] convergence for lattice parameter

2012-04-08 Thread funmi ayedun
Dear All, Good day all, I am a new user in quantum espresso, I am working on anatase TiO2 (with hexagonal structure) but? I have problem with convergence test? for lattice parameter for TiO2 system.? I have tried to vary celldm 1 from 8.2 to 9.0Bohr but I was unable get a convergence result. Al