A realistic equation of state for solids. The high pressure and high temperature thermodynamic properties of MgO

As has been found for pure metals, there exists a linear relationship betwe en molar volume and the logarithm of bulk modulus. This relation is also va lid for oxide and silicate substances. From the relationship, an equation o f state has been developed and applied to the substance MgO. With this equa tion of state and by using experimental thermodynamic data at 1 bar pressur e only, it is possible to make accurate predictions of thermodynamic proper ties at very high pressures and temperatures. Thermodynamic anomalies encou ntered in using e.g. a Birch-Murnaghan equation of state do not occur and t he number of adjustable parameters is reduced.