[Pw_forum] problem with phonon calculation

2015-09-04 Thread chaitanya varma
Dear Sir,I am trying to calculate DOS, pDOS and phonon densities etc of PbTiO3 -(tetragonal structure)SCF, NSCF and BANDS calculations worked out nicely with tetrahedra,but while doing ph.x calculation i am getting the following error  

Re: [Pw_forum] polarization:5cells of pbtio3

2015-09-04 Thread stefano de gironcoli
the coordinates and the lattice vectors are given in unit of alat so you need to add 1.08277316 x 1,2,3,4 where did you get 1.08 from? In any case you need to run an scf calculation first. stefano On 05/09/2015 01:39, Jaret Qi wrote: Hello all, I'm calculating the polarization of 5 cells of P

[Pw_forum] polarization:5cells of pbtio3

2015-09-04 Thread Jaret Qi
Hello all,I'm calculating the polarization of 5 cells of PbTiO3, I have set up the one unit cell correctly and got all of the properties in a good agreement as in literature. But when I tried to calculate the polarization of the 5 cells, I got this error when I run the nscf:error: too many bands

[Pw_forum] Problem in plotting potential using pp.x

2015-09-04 Thread Huang, Xu
Dear all, I'm using quantum espresso to plot the potential for hematite (Fe2O3) surface. I tried the 5.1, 5.1.1 and 5.2.0 version of qe. Only the 5.2.0 version can produce the final .xsf (as the fileout) result for me to plot the output file of potential (as filepp(1)). I used exactly the same