ABSTRACT
Information on thermodynamic properties of minerals at various temperature, pressure conditions, are important in the study of Earth’s sciences. Kieffer’s model is, in one hand, a good and powerful tool for determination on these properties of various minerals. In the other hand, the studies using various optical spectroscopic methods grow rapidly in Earth sciences, the usage of increasing data is also questionable. The Kieffer’s model obviously provides an area where these data are needed badly. Based on this understanding, we performed the Raman measurements on corundum and grossular up to 24 and 42 GPa pressures, respectively, and found that Kieffer’s model can be used to determine various thermodynamic properties not only in ambient conditions, but also in high pressure and high temperature conditions. Therefore, the use of Kieffer’s model will possibly shed a light to the understanding on the structure and movement in the deep interior of the Earth
