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Thermal Expansivity of Ionic Solids at Different Pressures and Temperatures

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In the present paper we have developed a model for determining the thermal expansivity of ionic solids at different pressures and temperatures up to the melting points. This model has been applied to determine values of thermal expansivity of NaCl and MgO for a wide range of pressures. It has been found that at a given temperature, the thermal expansivity decreases with increase in pressure and increases with increase in temperature. The increase in thermal expansivity with temperature calculated along isobars is found to decrease rapidly with increase in pressure. This finding is consistent with the thermodynamic constraint according to which the thermal expansivity must approach to zero for a material in the limit of extreme compression (V0).
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Keywords: High Pressures; High Temperatures; MgO; NaCl; Thermal Expansivity

Document Type: Research Article

Affiliations: 1: Department of Physics, Institute of Applied Sciences and Humanities, GLA University, Mathura 281406, India 2: Department of Physics, Jaipur Engineering College and Research Centre, Jaipur 302022, India

Publication date: November 1, 2016

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