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Bi2O3-SiO2系统相图的研究

费一汀; 范世(马岂); 孙仁英; M.Ishii+   

  1. 中国科学院上海硅酸盐研究所; 上海 200050; +SIT. Shonan Institute of Technology; Fujisawa 251, Japan
  • 收稿日期:1997-11-12 修回日期:1998-01-19 出版日期:1998-12-20 网络出版日期:1998-12-20

Study on Phase Diagram of Bi2O3-SiO2 System

FEI Yi-Ting; FAN Shi--Ji; SUN Ren-Ying; M. Ishii+   

  1. Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050 China;
    +SIT, Shonan Institute of Technology, Fujisawa 251, Japan

  • Received:1997-11-12 Revised:1998-01-19 Published:1998-12-20 Online:1998-12-20

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摘要：

本文通过DTA和XRD研究了Bi2O3－SiO2二元系稳定相平衡和亚稳定相平衡，并绘制了该系统完整的相图，发现在稳定相图富SiO2一侧存在包晶反应L＋SiO2Bi4Si3O12，包晶等温线大约在1030℃，Bi4Si3O12确定为近一致熔融化合物，并且用淬火微结构的方法确定了包晶反应的液相线．在Bi2O3－SiO2系统的亚稳定相平衡中研究了它的析晶行为，亚稳定相Bi2SiO5冷却时在845℃左右析晶．

关键词: Bi2O3-SiO2系统, 相关系, 稳定相平衡, 亚稳定相平衡

Abstract: Stable and metastable phase equilibria in a binary Bi2O3-SiO2 system were studied and a complete phase diagram
of the system was proposed with DTA and XRD. A peritectic reaction L + SiO2←→Bi4Si3O12 at the SiO2-rich side of stable phase diagram was identified to have peritectic temperature
at about 1030℃ and peritectic point close to the end of the peritectic isotherm. Bi4Si3O12 was observed to be a nearly congruently melting compound and liquidus of the peritectic
reaction was identified by quenching microstructure method. Crystallization behavior of Bi2O3
-SiO2 system was also investigated. The
results show that metastable Bi2SiO5 crystallizes out at 845℃.

Key words: Bi2O3-SiO2 system, phase relation, stable phase equilibrium, metastable phase equilibrium

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