Abstract
This work is devoted to a description of Coulomb crystals with isotopic impurities which are expected to be formed in degenerate stars interiors. We consider the case when the mass of impurities M' is slightly different from the mass of 'basic' ions M while fraction of impurities can be arbitrary. It is shown that the heat capacity perturbation theory of disordered crystals is in a good agreement with the linear mixing theory and with the exact calculations for binary crystals.
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