Yes, that you can say.

Typically the exact stoichiometry might not be so important compared to the distribution of your atoms. The relevance depends in particular on the size of your supercell and the types of order you introduced. It can make a lot of difference if you have different local environments for the same elements in the cell and also checked for some preferential short-range order.

Regards
Am 13.08.2016 um 11:16 schrieb ‪Amir lot‬ ‪:
Dear Wien2k-users,

Suppose I would like to study AB0.6C0.4compound using AB structure and
replacing B atom with C atom.

I could make AB0.612C0.398structure using  "supercell" program and AB
structure.

Can we say results of AB0.6C0.4 will be the same as AB0.612C0.398?

With best,

Amir


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