北京大学学报（自然科学版）

Ca1-xSrxTiO3(0≤x≤1)体系粉晶X射线研究

秦善,鲁安怀,巫翔   

  1. 北京大学地质学系，北京 100871
  • 收稿日期:2000-06-30 出版日期:2001-11-20 发布日期:2001-11-20

Powder X-ray Study on Perovskites in the System of Ca1-xSrxTiO3(0≤x≤1)

QIN Shan, LU Anhuai, WU Xiang   

  1. Department of Geology, Peking University, Beijing, 100871
  • Received:2000-06-30 Online:2001-11-20 Published:2001-11-20

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摘要： 利用粉晶X射线在室温下对CaTiO3-SrTiO3体系中钙钛矿型化合物进行了系统测量和结构精化。随着Sr含量的增加，Ca1-xSrxTiO3(0≤x≤1)从斜方晶系的Pbnm结构依次转变为斜方Bmmb, 四方I4/mcm和等轴Pm3m结构。其相转变边界依次为：Pbnm-Bmmb x=0.45(5)，Bmmb-I4/mcm x=0.65(5)和I4/mcm-Pm3m x=0.92(2)。

关键词: 粉晶X射线, 相转变, 钙钛矿, CaTiO3-SrTiO3

Abstract: The structures of perovskites in the system CaTiO3-SrTiO3 were measured and refined at room temperature by X-ray powder diffraction. The sequence of phase transitions for Ca1-xSrxTiO3(0≤x≤1), found with increasing Sr content, is orthorhombic Pbnm, orthorhombic Bmmb, tetragonal I4/mcm and cubic Pm3m. The boundaries of phase transitions are at x=0.45(5)for Pbnm-Bmmb, x=0.65(5) for Bmmb-I4/mcm and x=0.92(2) for Pm3m, respectively.

Key words: powder X-ray, phase transition, perovskite, CaTiO3-SrTiO3

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