Determination of the Temperature Dependence of Heat Capacity for Some Molecular Crystals of Nitro Compounds

Article

An analysis of the existing approximations used for describing the dependence of heat capacity at a constant volume on the temperature of a molecular crystal has been carried out. It is shown that the considered Debye and Einstein approximations do not enable one to adequately describe the dependence of heat capacity at a constant volume on the temperature of the molecular crystals of nitro compounds. This inference requires the development of special approximations that would describe both low-frequency and high-frequency parts of the vibrational spectra of molecular crystals. This work presents a universal dependence allowing one to describe the dependence of heat capacity at a constant volume on temperature for a number of molecular crystals of nitro compounds.

Keywords

equation of state molecular crystal Helmholtz energy Planck constant Boltzmann constant Debye approximation Einstein approximation 

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.South-Ural State University (National Research University)ChelyabinskRussia

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