I have researched on the Earth's mantle constituent minerals and their analogue materials using thermodynamic approaches and crystal structure analyses. In this article, the following my representative studies are introduced: (1) Rietveld analyses of Al-bearing MgSiO3 bridgmanites to show some crystal structural evidences for the aluminum substitution with oxygen vacancies, (2) crystal structure determinations for newly found high-pressure phases of SrSi2O5, Mg2Al2O5, CaRuO3, and CaRhO3, (3) development of thermal expansion and heat capacity estimation methods for calcium ferrite-type MgAl2O4 using the Grüneisen relation equation, high-pressure micro-Raman spectroscopy and Kieffer model calculation of heat capacity, (4) re-determination of the post-spinel phase transition enthalpy in Mg2SiO4 by drop-solution enthalpy measurements of MgSiO3 bridgmanite, MgO and Mg2SiO4 ringwoodite, (5) re-measurement of high-temperature heat capacity of Mg2SiO4 ringwoodite, and (6) thermodynamic calculation of the post-spinel transition boundary in Mg2SiO4 by adopting the new phase transition enthalpy and heat capacity of Mg2SiO4 ringwoodite, independent of those determined by high-pressure high-temperature experiments. The developed estimation methods for thermal expansion and heat capacity are useful to assess internally-consistent thermodynamic data sets of mantle minerals.
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