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Analysis of some two-parameter equations of state for the NaCl crystal
Xiao-Qing Deng, Zu-Tong Yan

An isothermal equation of state (EOS) for ionic crystal solids is derived by starting from the theory of interionic potential and the simple Born – Mayer potential model. A critical analysis of the two-parameter equations of state: Birch – Murnaghan EOS, Kumar EOS, Vinet EOS, Shanker EOS, and the one derived here, D – Y EOS, is presented by investigating the pressure – volume and isothermal bulk modulus data for the NaCl crystal. The results show that the D – Y EOS is in good agreement with the other EOSs and with experimental data up to very high pressures.

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