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Статья
2020

Connection between Entropy and Thermal Expansion during the Extreme Compression of a Substance


L. R. FokinL. R. Fokin, E. Yu. KulyaminaE. Yu. Kulyamina, V. Yu. ZitsermanV. Yu. Zitserman
Российский журнал физической химии А
https://doi.org/10.1134/S0036024420020107
Abstract / Full Text

The nature of the dependence of the coefficient of thermal expansion on the degree of compression of a solid is studied in general form. It is shown that the asymptotic behavior of this dependence under extreme compression is responsible for the behavior of entropy. It is established that without a special procedure connecting thermal expansion and the equation of state, it is impossible to ignore the anomalous behavior of entropy with its divergence and negative sign. The procedure is tested on experimental data for NaCl. A simple example using the Debye model illustrates the reason for possible anomalies: the lack of consistency between the thermal and caloric equations of state.

Author information
  • Joint Institute for High Temperatures, Russian Academy of Sciences, 125412, Moscow, RussiaL. R. Fokin, E. Yu. Kulyamina & V. Yu. Zitserman
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