R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy

[R2-04] Structural change of Al-bearing CaTiO₃ perovskite

*TAKAYA NAGAI¹, Naoki Takakura¹, Yosuke Matsumoto¹, Xianyu Xue² (1. Hokkaido Uni. Sci., 2. Okayama Uni. IPM)

Keywords: Al-bearing CaTiO_3-perovskite, morphotropic transition, XRD, NMR

Structure change of Al-bearing CaTiO₃ -perovskite synthesized by the conventional solid-state reaction method was investigated. Chemical composition of Al-bearing CaTiO₃ -perovskite showed that Al exchanges Ti and the solubility of the Al component is up to about 25 mol%. XRD patterns indicated a series of morphotropic transition from orthorhombic to cubic via tetragonal. NMR spectra showed Al occurring in octahedral, pentahedral and tetrahedral sites.