[Pw_forum] impurity

[Mansoureh Pashangpour]

Dear all
I am going to calculate affect of adding impurities to a system.I know I
must consider a supercell for this propose but I don't know how and where I
should add an impurity?How can I have different percent of impurities in a
system?
please let me know its answer.
good luck
Mansoureh
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