钙钛矿(结构)
硅酸盐钙钛矿
硅酸盐
金刚石顶砧
无定形固体
材料科学
结晶学
六方晶系
八面体
地幔(地质学)
矿物学
高压
碱土金属
后钙钛矿
晶体结构
化学
地质学
热力学
地球化学
金属
冶金
物理
有机化学
作者
Hitoshi Yusa,Masaki Akaogi,Nagayoshi Sata,Hiroshi Kojitani,Yoshitaka Kato,Yasuo Ohishi
出处
期刊:American Mineralogist
[Mineralogical Society of America]
日期:2005-05-01
卷期号:90 (5-6): 1017-1020
被引量:16
摘要
The presence of hexagonal silicate perovskite (6H-BaTiO3 type) was confirmed in the SrSiO3 compound by in-situ angle dispersive X-ray diffraction at high pressure. The perovskite was crystallized from pressure-induced amorphous SrSiO3 in a diamond anvil cell by laser heating at 35 GPa. On releasing the pressure, the perovskite also changed into an amorphous state as does CaSiO3 perovskite. This SrSiO3 perovskite, with a tolerance factor greater than unity, forms a face-sharing SiO6 octahedron, which leads to a structure with hexagonal symmetry. Incorporation of Sr into CaSiO3 perovskite in the early stage of the differentiation in the Earth's mantle might have influenced the symmetry of CaSiO3 perovskite in the present lower mantle. As far as we know, this is the first report suggesting the existence of hexagonal perovskite in silicates.
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