硫酸盐类晶体中[SO4]2-四面体的结晶方位与晶体的形貌

本文从硫酸盐类晶体中负离子配位多面体的结和相互联结的稳定性出发，探讨了硫酸在晶体中「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一密切相关，四面体的面和棱的法线（Ｌ＾２）所对向的对

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

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.