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[×ÊÔ´] calculating ideal strength of crystal using VASP

http://code.google.com/p/ideal-strength-vasp/downloads/list
Recently, I write a python script to calculate ideal strength of crystal combination with VASP. You can download it from above website.
the details is found from readme in wiki at that website.

Introduction
About method details, please see PRL 82,2713(1999)

Details
First you need to modify vasp code. If you want to calculate ideal tensile strength, you should add 'FCELL(1,1)=0.0' to constr_cell_relax.F of vasp code. And if you choose ideal shear strength, you should add 'FCELL(1,3)= 0.0' and 'FCELL(3,1) = 0.0' to constr_cell_relax.F of vasp code. Here, you need to recompile vasp.

second, you should prepare input.dat and this file as below:

POSCAR
0.02 #strain
20 #step
-45.0 -35.264390 0.0 # rotate Z, Y and X.
1 # 1 tensile, 2 shear
mpiexec -np 8 vasp.4.6

The first line is the name of POSCAR. The second line is strain of distortion. The third line is total step of distortion. The fourth line is degree of rotation. This is for calculating special orientation. For example, if you want to calculating ideal strength of Diamond along 100, you just set 0.0 0.0 0.0. If you want to calculate 110 orientation, you need set -45.0 0.0 0.0. If you want to calculate 111 orientation, you need set -45.0 -35.264390 0.0. The five line is to choose tensile of shear. The sixth line is execute command.



[ Last edited by gavinliu7390 on 2011-5-20 at 14:09 ]

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https://sourceforge.net/projects/ideal-strength-vasp/

[ Last edited by gavinliu7390 on 2015-3-14 at 08:31 ]
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