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The equation of state for samarium chalcogenides is calculated at $T=0$ in a model in which the promotion of an electron from f level to d band is accompanied by a lattice contraction so that the chemical potential of the d electrons is reduced. With the nonlinearity in the lattice contraction as a function of d band occupation taken as a variable parameter and using known spectroscopic and elastic data on samarium chalcogenides, an equation of state is calculated which agrees to within 20% with the experimental results.
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Varma et al. (1975) studied this question.
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