Nu carbon atoms
N iron atoms
_iNFe octahedral sites
Number of Fe-C and Fe-Fe pairs invariant. Therefore, only difference is C-vacancy and C-C pairs.
u - u0 u - u
Let number of u - u0 pairs = W _
where _ is unknown
u - u = 0.5 W(Nu - __
u0 - u0 = 0.5 W(_iNFe- Nu - __
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