350 rub
Journal Dynamics of Complex Systems - XXI century №4 for 2009 г.
Article in number:
The Influence of Thermal Vacancies on thermodynamic Properties and Stability of Fullerites
Keywords: thermal vacancies fullerites correlative method of unsymmetrized self-consistent field Girifalco interaction potential vacancy formation parameters thermodynamic properties
Authors:
V.I. Zubov, I.V. Zubov
Abstract:
We study an influence of thermal vacancies on equilibrium thermodynamic properties of the high-temperature phase of fullerites taking into account the strong anharmonicity of the lattice vibrations. Treating a crystal with point defects as a quasi-multicomponent system and using the correlative method of unsymmetrized self-consistent field and the Girifalco interaction potential for the molecular subsystem, we have obtained the vacancy formation parameters for the C60 fullerite. We also take into account the divacancies. The influence of the lattice defects on the specific heats of fullerites is negligible, since a dominant contribution to them is given by intramolecular degrees of freedom. We have calculated contributions of vacancies to various thermodynamic properties: the volume thermal expansion coefficient, the isothermal bulk modulus and the components of the isothermal elastic tensor, depending on the temperature and pressure. Near the estimated triple point, these contributions run to more than 10 per cent and increase still further at a metastable region. We also discuss the influence of defects on the thermodynamic stability of fullerites.
Pages: 52-57
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