无机材料学报

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赝二元系LiF-CaAlF5相图

陈红兵; 范世Ji   

  1. 中国科学院上海硅酸盐研究所; 上海 200050
  • 收稿日期:1999-06-08 修回日期:1999-08-06 出版日期:2000-06-20 网络出版日期:2000-06-20

Phase Diagram of Pseudo-binary System LiF-CaAlF5

CHEN Hong-Bing; FAN Shi-Ji   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-06-08 Revised:1999-08-06 Published:2000-06-20 Online:2000-06-20

摘要: 本文通过差热分析(DTA)和X射线粉末衍射(XRD)方法研究了赝二元系LiF-CaAlF5的相平衡关系.该赝二元系在LiF:CaAlF5=1:1处形成一致融熔化合物LiCaAlF6,其熔点为814℃,并分别在LiF~LiCaAlF6和LiCaAlF6~CaAlF5区域形成两个共晶体系,其共晶温度分别为705℃和781℃.根据体系的相图,采用坩埚下降法生长出氟化物激光晶体Cr3+:LiCaAlF6

关键词: LiF-CaAlF5, 相平衡, 晶体生长

Abstract: The phase equilibrium in pseudo-binary system LiF-CaAlF5 was studied by means of thermal analysis (DTA) and X-ray diffraction (XRD). A congruent melting compound LiCaAlF6 with melting point of 814℃ produces at the composition of LiF:CaAlF5=1:1. There exist two eutectic systems from LiF to LiCaAlF6 and from LiCaAlF6 to CaAlF5 with eutectic temperatures of 705℃ and 781℃ respectively. According to the proposed phase diagram, fluoride laser crystal Cr3+:LiCaAlF6 was grown by Bridgman method.

Key words: LiF-CaAlF5, phase equilibrium, crystal growth

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