Calculation of the Gruneisen Parameter and Its Pressure Dependence for NaCl

The Gruneisen parameter and its pressure dependence for NaCl are calculated by using the rigid-ion model. In the calculation a new form of potential energy, which has been used previously to successfully calculate the equation of state of NaCl, is adopted as follows. Two forms of modified Born-Mayer potential are used as the functional forms of the repulsive energy between the nearest neighbor ions and the correlation energy are also taken into account by using the data from the electronic gas model. The agreement of our results with the experimental data is satisfactory.