Variations in thermal properties of diamond under isothermal compression
- Autores: Magomedov M.1
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Afiliações:
- Institute of Geothermal Problems, Dagestan Scientific Center
- Edição: Volume 62, Nº 5 (2017)
- Páginas: 661-668
- Seção: Theoretical and Mathematical Physics
- URL: https://journals.rcsi.science/1063-7842/article/view/199348
- DOI: https://doi.org/10.1134/S1063784217050176
- ID: 199348
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Resumo
State equation P(V/V0, T) and baric dependences of thermal properties of diamond have been obtained without any fitting parameters from the interatomic pair Mie–Lennard-Jones potential and the Einstein model of a crystal. Calculations have been performed along two isotherms (at T = 300 and 3000 K) up to P = 10000 kbar = 1000 GPa, i.e., to a relative volume of V/V0 = 0.5. The baric dependences have been obtained for the following characteristics: isothermal elastic modulus BT and B'(P), isochoric heat capacity Cv and Cv' (P), isobaric heat capacity Cp; thermal expansion coefficient αp and αp' (P); and specific surface energy σ, as well as its derivatives σ'(P) and σ'(T). It is shown that for P → ∞, functions BT(P) and σ(P) vary linearly, functions B'(P), αp(P), Cv(P), Cp(P) and σ'(P) tend to constants, while functions αp'(P), Cv'(P), and difference Cp(P)–Cv(P) tend to zero. Good agreement with experimental data has been demonstrated.
Sobre autores
M. Magomedov
Institute of Geothermal Problems, Dagestan Scientific Center
Autor responsável pela correspondência
Email: mahmag4@mail.ru
Rússia, Dagestan, 367030