Equation of state of NaCl: Ultrasonic measurements to 8 kbar and 800°C and static lattice theory

Abstract The elastic properties of NaCl have been measured ultrasonically as a function of pressure and temperature, from 0 to 8 kbar and from 300 to 800°K. Together with zero pressure data on thermal expansivity and heat capacity, these data permit the specification of the equation of state ( PVT ) throughout the P–T range measured. This permits extrapolation of high temperature ( T > θ D ) data to zero temperature for comparison with properties predicted for a static lattice. A Born lattice model calculation shows the importance of second nearest neighbor interactions, ionicity and the functional form of the potential. The measured equation of state permits detailed comparison with theory, and the separation of volume and temperature effects. Gruneisen's parameters is shown to be primarily dependent on volume, with small temperature dependence; it is not a linear function however.

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