Equation of state and the thermal expansion of KCl and KI

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Abstract
The equation of state and the thermal expansion of KCl and KI have been studied by evaluating the vibration spectra at different volumes with the help of the simple shell model. An exponential form of the potential energy of the crystal lattice has been used in the investigation. Isotherms have been drawn and the coefficients of thermal expansion have been evaluated for different temperatures in the range 0-1000°K. Unlike the results of early workers, the present calculations show that the melting-point isotherm cuts the zero-pressure axis and does not have a minimum. It has also been shown, in agreement with experiments, that the thermal expansion at the melting point has a finite value. Our results show a good agreement with the experimental data right up to the melting point.

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