From what I know, the formula is Nv=N(e-Qv/kT)
where:
Nv - total number of vacancies
N - total number of atomic sites
Qv - energy required to
T - temperature
k - Boltzmann's constant = 1.38x10-23 J/atom-K or 8.62x10-5 eV/atom-K
Context: So my professor was discussing 0- dimensional defects when I asked the question at the title, but he didn't have the answer and then proceeded to give it to me as a graded homework to provide him an answer. I have no idea where to look for the answer. Hope someone can help me out.