Abstract
An important objective of the earth sciences is to develop the capability of predicting the thermodynamic properties of minerals and their phase relations under various pressure-temperature conditions in the earth, moon and the terrestrial planets. Experimentally, thermodynamic properties such as specific heat can be measured by adiabatic and differential scanning calorimetry. However, there are cases, in which the determination of the low temperature specific heat by adiabatic calorimetry is not feasible due to the paucity of materials. Such is the case for the high-pressure and high-temperature magnesium silicate phases: Mg2SiO4 (β- and γ-spinel) and MgSiO3 (ilmenite, perovskite and garnet) considered to be stable in the earth’s mantle. These phases are synthesized in cubic-anvil and split-sphere apparati in 10 to 20 mg quantities, that are barely adequate for the specific heat measurement by differential scanning calorimetry (DSC), usually in the range 300 to 900 K. Hence, the ability to correctly predict the low temperature specific heat of these phases would be extremely useful. Such a theoretical treatment should at the same time provide an understanding of the thermodynamic properties of minerals at the atomistic level. This was the goal aimed at the Mineralogical Society of America Short Course organized by S.W. Kieffer and A. Navrotsky on “Macroscopic to microscopic: Atomic environments to mineral thermodynamics” held at Washington College, Chestertown, Maryland in spring, 1985.
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Ghose, S., Choudhury, N., Chaplot, S.L., Rao, K.R. (1992). Phonon Density of States and Thermodynamic Properties of Minerals. In: Saxena, S.K. (eds) Thermodynamic Data. Advances in Physical Geochemistry, vol 10. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2842-4_11
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