Abstract
The temperature dependence of the heat capacity of structures formed by alternating layers with different atomic compositions is described using the model of interacting three- and two-dimensional Debye sublattices. The parameters of the model are the characteristic temperatures Θ1 and Θ3 of the sublattices and the characteristic temperature Θ2 corresponding to vibrations between the sublattices. (In the accepted approximation, Θ2 equals the characteristic Debye temperature of the substance at absolute zero.) The model was used to analyze the temperature dependences of the lattice (phonon) heat capacities of transition and rare-earth metal diborides MB2. This allowed the characteristic temperatures Θi and trends of their variations depending on metal atomic numbers to be determined.
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