THERMAL EXPANSION Units Conversions

Here, ay is the thermal expansion coefficient which is assumed to be equal in both lattices and 6 is the dilatation coefficient (Khs — ls)/ ls> where Fls and Fhs are the unit cell volumes of the pure LS and HS species at 0 K, respectively. In order to account for the anisotropy of the lattice, the thermal expansion v and dilatation e coefficients must be introduced as tensors instead of scalars. Similarly, an equivalent expression could be defined for pressure-induced spin conversions. 

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