Cd Si

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Revision as of 17:29, 4 June 2012 by Vaspmaster (talk | contribs)

Description: the bash-script loop.sh runs Si in the cubic diamond (cd) structure at several different lattice constants (5.1-5.7 Å) and collects free energy versus lattice constant into the file SUMMARY.dia


  • INCAR
System = diamond Si
ISTART = 0 ; ICHARG=2
ENCUT  =    240
ISMEAR = 0; SIGMA = 0.1
  • KPOINTS
k-points
 0
Monkhorst Pack
 11 11 11
 0  0  0
  • POSCAR
cubic diamond
   5.5
 0.0    0.5     0.5
 0.5    0.0     0.5
 0.5    0.5     0.0
  2
Direct
 -0.125 -0.125 -0.125
  0.125  0.125  0.125
  • And a simple bash-script to loop over several lattice constants: loop.sh
#! /bin/bash
BIN=/path/to/your/vasp/executable
rm WAVECAR SUMMARY.dia
for i in  5.1 5.2 5.3 5.4 5.5 5.6 5.7 ; do
cat >POSCAR <<!
cubic diamond
   $i 
 0.0    0.5     0.5
 0.5    0.0     0.5
 0.5    0.5     0.0
  2
Direct
 -0.125 -0.125 -0.125
  0.125  0.125  0.125
!
echo "a= $i" ; mpirun -n 2 $BIN
E=`awk '/F=/ {print $0}' OSZICAR` ; echo $i $E  >>SUMMARY.dia
done
cat SUMMARY.dia

Mind: You will have to set the correct path to your VASP executable (i.e., BIN), and invoke VASP with the correct command (e.g., in the above: mpirun -np 2).

  • To make a quick plot of SUMMARY.dia try:
gnuplot
gnuplot> plot "SUMMARY.dia" using ($1):($4) w lp

Download

name.tgz


To the list of examples or to the main page