COMPARISON OF SOME EQUATION-OF-STATE THEORIES BY USING EXPERIMENTAL HIGH-COMPRESSION DATA

Three theories that are of importance for planetary physics are examined by establishing whether the curves in the pressure-density diagram which have been calculated from the appropriate equations of state satisfactorily describe the dynamic and static data obtained for cubic solids. For this purpose, the fourth-order anharmonic theory derived from lattice dynamics, a theory based on the Eulerian formulation of finite strain, and a new theory as outlined in Section 2 have been compared. It is found that the new theory yields results that show the best agreement with the measured values. © 1979.