Structural Study on Analogs of the Earth's Interior Materials as a Function of Temperature

- on CaGeO₃ High-Pressure Perovskite Phase

Abstract

Structural studies on analogs of the Earth's interior materials can give important insights into the understanding for material construction, physical properties and dynamics in the Earth's interior. In particular, CaGeO₃ high-pressure perovskite phase is an excellent low-pressure analog of MgSiO₃ bridgmanite, the most dominant constituent in the Earth's lower mantle, with the orthorhombic Pbnm perovskite-type structure. I here review our recent structural research of CaGeO₃ perovskite as a function of temperature. The research leads to the earth-scientific implication as to the phase transition of MgSiO₃ bridgmanite in the Earth's lower mantle.