In the present study we derive new relationships to predict the temperature dependence of elastic constants. Proposed relationships are applied to study elastic constants of NaCl and KCl. A linear relationship between thermal expansivity and elastic constants at high temperatures is found to exhibit for solids. The extrapolated data on elastic constants in very high temperature region obtained in the present study are useful to understand the thermoelastic properties of NaCl and KCl. A close agreement between theory and experiment reveals the validity of the formulations used. © 2007 Elsevier Ltd. All rights reserved.
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