Pressure Dependence of Interatomic Separation and Thermal Expansivity for Alkali Halides and Periclase (MgO)
Q. Liu
Department of Physics, Anhui University, Hefei 230039, China
Received: October 22, 2008; Revised version: February 3, 2009;
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In this paper, a new isothermal equation of state is developed based on an approximation for the volume dependence of the Anderson-Gr├╝neisen parameter ╬┤T along isotherm. The values of interatomic separation r with the change of pressure for nine alkali halides and periclase were investigated with the help of the new isotherm equation of state. The compression data are used to predict the pressure dependence of the coefficient of volume thermal expansion. The results are compared with the available experimental data and other theoretical results.
DOI: 10.12693/APhysPolA.115.709
PACS numbers: 64.30.-t, 65.40.De, 91.60.Ki