1. Installation of phonopy
ubuntu12.04 + python3.5.0
(1) python 3.5.0
extract the pack, and then,
cd Python-3.5.0/ sudo ./configure --prefix=/opt/python3.5.0 sudo make sudo make install
(2) some pack
sudo apt-get install python2.7-dev python-numpy python-matplotlib python-tk python-lxml python-yam
maybe some of them are useless, uhmmmmmm.....even I don‘t know what they mean.
(3) phonopy
sudo python setup.py install
2. VASP & phonopy, DFPT method
(1) relax the coordinate with a high accuracy by VASP. We will use the POSCAR, maybe the CONTCAR.
(2) copy and rename the coordinate file to POSCAR-unitcell
(3) some command
phonopy -d --dim="2 2 2" -c POSCAR-unitcell mv SPOSCAR POSCAR
(4) now we will calculate force constants of the supercell by VASP
IMPORTANT: IBRION = 8, NSW = 1, LREAL = .FALSE
NOTICE: NO NPAR!
the INCAR may be such like
PREC = Accurate ENCUT = 500 61 IBRION = 8 EDIFF = 1.0e-08 IALGO = 38 ISMEAR = 0; SIGMA = 0.1 LREAL = .FALSE. ADDGRID = .TRUE. LWAVE = .FALSE. LCHARG = .FALSE.
(5)after a longtime caculation, we will find the vasprun.xml.
phonopy --fc vasprun.xml
we get the FORCE-CONSTANT
then, we should make a file named xxx.conf(maybe band.conf), which contains some parameters.
it may like this
ATOM_NAME = Na Cl DIM = 2 2 2 PRIMITIVE_AXIS = 0.0 0.5 0.5 0.5 0.0 0.5 0.5 0.5 0.0 BAND = 0.0 0.0 0.0 0.5 0.0 0.0 0.5 0.5 0.0 0.0 0.0 0.0 0.5 0.5 0.5 FORCE_CONSTANTS = READ
then, we use this commander
phonopy --dim="2 2 2" -c POSCAR-unitcell band.conf
we get the band.yaml, then
bandplot --gnuplot band.yaml > phono.dat
(6)finally, put the phono.dat into origin, matlab, MS excel and etc.
Reference: phonon manual.
phonon dispersion spectra VASP 5.3.3 + phonopy 1.10
原文：http://www.cnblogs.com/HuaNeedsPills/p/5014013.html