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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

硫酸盐类晶体中[SO4]2-四面体的结晶方位与晶体的形貌

仲维卓; 王步国; 施尔畏; 华素坤   

  1. 中国科学院上海硅酸盐研究所; 上海200050
  • 收稿日期:1995-10-23 修回日期:1995-12-04 出版日期:1997-02-20 网络出版日期:1997-02-20

Relationship Between the Orientation of Tetrahedral [SO4]2- in Sulfate Crystals and Their Morphology

ZHONG Weizhuo; WANG Buguo; SHI Erwei; HUA Sukun   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1995-10-23 Revised:1995-12-04 Published:1997-02-20 Online:1997-02-20

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摘要： 本文从硫酸盐类晶体中负离子配位多面体的结晶方位和相互联结的稳定性出发，探讨了硫酸盐类晶体中[SO4]2-结晶方位与晶体结晶形貌之间的关系;认为[SO4]2-四面体与金属阳离子（Ba2+、Ca2+、Mg2+…）结合时，由于晶体结构和生长条件（如温度、过饱和度等）的不同，在晶体各族晶面上的叠合速率和取向不同;晶体的结晶形貌迥然有别.晶体的结晶形貌与[SO4]2-四面体在晶体中的结晶方位密切相关，四面体的面和棱的法线（L2）所对向的晶面，生长速率慢，顽强显露，均属晶体的板面;四面体的顶角所指向的晶面，生长速率快，显露面积小，经常消失.

关键词: 硫酸盐晶体, 负离子配位多面体, 键合能, 结晶形貌

Abstract: The relationship between the orientation of tetrahedral [SO4]2- in sulfate crystals such as barite,anhydrite, epsomite and jarosite and their morphology was studied from the standpoint of crystal chemistry,and the formation inechanisin of their morphology was analysed according to the structural orientation of tetrahedral [SO4]2- and the bonding energy between [SO4]2- and metal ions [M2+] during growth. It was found that the inorphology ofsulfates is related to the orientation of tetrahedral [SO4]2- in the crystal, i.e., the faces, the edges and faees of the tetrahedra normal to, are expected to grow slowly and observed in final form; in contrast, the faces, the vextices of the tetrahedra pointing to, usually grow fast, and will disappear.

Key words: sulfate crystals, anion coordinated polyhedra, bonding energy, morphology