A new method for thermal pressure using equations of state for MgO

In the present study we have developed a new method for determining thermal pressure in case of MgO using the Kushwah pressure–volume equation along different isotherms at selected temperatures up to 1800 K. The results obtained down to a compression, V/V0 = 0.6, present close agreement with the values determined from the Stacey reciprocal K-primed equation. The present method is based on the idea of using equations of state for variations of pressure with volume to represent variations of pressure with temperature in order to determine values of thermal pressure, which is defined as the pressure that would prevent volume thermal expansion. It has been found that the thermal pressure for MgO depends on temperature as well as compression.

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