Temperature dependence of volume thermal expansion for NaCl and KCl crystals

A new relation for predicting volume thermal expansion of alkali halides at high temperatures is derived based on the assumption that the two different diffusional driving force models presented, respectively, by Sharma and Sharma (Indian J. Pure Appl. Phys. 29 (1991) 637) and Singh (J. Phys. Chem....

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2005-03, Vol.357 (3), p.433-438
Main Author: Fang, Zheng-Hua
Format: Article
Language:English
Subjects:
Bulk modulus
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Ionic solids
Physics
Thermal expansion
Thermal expansion
thermomechanical effects and density
Thermal properties of condensed matter
Thermal properties of crystalline solids
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Summary:A new relation for predicting volume thermal expansion of alkali halides at high temperatures is derived based on the assumption that the two different diffusional driving force models presented, respectively, by Sharma and Sharma (Indian J. Pure Appl. Phys. 29 (1991) 637) and Singh (J. Phys. Chem. Solids 63 (2002) 1935) are equivalent. The input parameters needed for the calculation are the volume thermal expansion coefficient and the isothermal Anderson–Gruneisen parameter, both at room temperature and zero pressure, which are available from the literature. The tests on NaCl and KCl crystals demonstrate that the agreement between the calculated results obtained by this relation and the corresponding experimental data is very good. The applicability of the relation as well as some thermodynamic relationships included in its derivation is discussed.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2004.12.010