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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

掺Li的SrB4O7的晶体结构和微结构的X射线粉末衍射研究

刘红超; 郭常霖; 范世(马岂); 徐一斌   

  1. 中国科学院上海硅酸盐研究所; 上海200050
  • 收稿日期:1995-12-20 修回日期:1996-01-15 出版日期:1997-02-20 网络出版日期:1997-02-20

Study on the Crystal Structure and Microstructure of SrB4O7 doped with Li by X-ray Powder Diffraction

LIU Hongchao; GUO Changlin; FAN Shiji; XU Yibin   

  1. Shanghai Institute of Ceramics; Chinese Academy of Scicnces Shanghai 200050 China
  • Received:1995-12-20 Revised:1996-01-15 Published:1997-02-20 Online:1997-02-20

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摘要： 掺Li对SrB4O7的性能有一定的影响.本工作用X射线粉末衍射结构分析方法研究了掺Li的SrB4O7的晶体结构和微结构.空间群为Pmn21，晶胞参数为a=10.741（5）A, b=4.245（1）A，c＝4.437（1）A;掺杂的SrB4O7晶胞参数较纯SrB4O7的略有增大;阐述了产生这种变化的原因.在该晶体结构中，Li进入SrB4O7晶格空隙，成为间隙离子;这种结构有利于提高晶体的非线性光学系数.文中还比较了文献中SrB4O7的晶体结构数据，分析了其中存在的问题.

关键词: SrB4O7, 晶体结构, 微结构, X射线粉末衍射, Rietveld方法

Abstract: The doped Li ion has aneffect on both the crystal structure and property of SrB4O7. The crystal structure and microstructure of doped SrB4O7 was studied in detail from X-ray powder diffraction data. Its space group is Pmn21, cell parameters: a=1O.741(5)A, b=4.245(1)A, c=4.437(1)A, a little bigger than those of SrB4O7. Reasons for thesc changes were presented. In the cel1, Li ions occupy part of the vacancy between B-O layers; such a structure can improve the nonlinear optical coefficicnts. The errors of crystal data from references were also analyzed.

Key words: SrB4O7, crystal structure, microstructure, X-ray powder diffraction, rietveld method