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If you have D di-vacancies in a BCC crystal with N atoms, what is the entropy contributed from these di-vacancies?

If you have D di-vacancies in a BCC crystal with N atoms, what is the entropy contributed from these di-vacancies?(*a di-vacancy is a pair of vacancies neighboring each other, we also assume that the concentration of the di-vacancy is very small, so they do not near each other)



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