Abstract
The temperature dependences of the lattice heat capacity of yttrium, terbium, erbium, and lutetium diborides have been studied using Montroll’s method of moments. The characteristic temperatures of the diborides are determined at absolute zero temperature and at the temperature tending to infinity. The geometric mean frequencies of phonon spectra have been calculated. The influence of the rare-earth ion mass and the lanthanide contraction phenomenon on the lattice dynamics has been analyzed for the rare-earth diborides.
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