High-Pressure Phase Transition Crystal Chemistry Ⅱ. Changes of Ionic Radius and Ionic Migration Behaviors of Oxygen and Silicon in Magnesium Silicates and Silicon-Magnesium Oxides Under High Pressures
详细信息
- 责任者：Shi Nicheng (Crystal Structure Laboratory ; China University of Geosciences ; Beijing 100083 ; China) ; Li Guowu
- 刊名：Acta Mineralogica Sinica
- 出版年：2010
- 卷期：30(4)
- 关键词：硅酸盐矿物 ; silicates ; 氧化物矿物 ; oxides ; 晶体化学 ; crystal chemistry
- 页码：p.411-416
- 图表：3 illus., 1 table, 13 refs.
- 分类号：0700
- issnNo：ISSN1000-4734
- isbnNo：CN52-1045/P
摘要
In this paper, the study on crystal chemical behavior of silicon and oxygen ions in Mg2SiO4 and MgSiO3 under high pressures were continued. Ionic radii of oxygen and silicon in magnesium silicate and magnesium-silicon oxides, i.e. olivine, ringwoodite, and the phases of Mg2SiO4, MgSiO3 (perovskite and post perovskite)under high pressures were investigated. The result indicated that ionic radius of oxygen decreased gradually with increasing pressure, but cation radius of silicon increased with increasing pressure and the occurrence of phase transition. Radii of silicon cation of SiO2 polymorphs also increased with phase transition under high pressures. This variation may be result of a transition from ionic compounds to metallic compounds under high pressures.
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