60 巻 (2018) 1 号 p. 24-31
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.