High-pressure phase equilibria and thermodynamic properties of silicate minerals and related materials in the lower mantle conditions

测量了硅酸盐钙钛矿的热力学性质，并利用该热力学性质来细化尖晶石后的高压相变边界。测定了铁酸钙与含有大量钙、铝和碱金属元素的CAS相在高压下的稳定性关系。这些阶段发生在俯冲到下地幔的玄武岩地壳的高压阶段。一些具有钙钛矿结构的金属氧化物在较低的压力下表现出钙钛矿后转变，而硅酸盐钙钛矿则发生在最底部的地幔。测定了金属氧化物的高压相关系和热力学性质。

Thermodynamic properties of silicate perovskite were measured and used to refine the post-spinel phase transition boundary at high pressure. Stability relations of calcium ferrite and CAS phase which contain large amounts of calcium, aluminum and alkali-metal elements were determined at high pressure. The phases occur as high pressure phases of basaltic crust subducted into the lower mantle. Some metal oxides with the perovskite structure were found to show the post-perovskite transition at lower pressure than that of silicate perovskite which occurs at the lowermost mantle. The high-pressure phase relations and thermodynamic properties of the metal oxides were determined.