BaY_2F_8晶体生长基元与结晶机理的探讨  

Discussion about the Growth Unit and Crystallization Mechanism of BaY_2F_8

作　　者：张守超[1] 阮永丰[1] 李广慧[1] 李文润[1] 

机构地区：[1]天津大学理学院,天津300072

出　　处：《人工晶体学报》2007年第3期485-489,共5页Journal of Synthetic Crystals

摘　　要：本文通过对BaY2F8晶体结构的分析,从晶体的生长基元为负离子配位多面体理论出发,对自然冷却条件下BaY2F8晶体自发结晶习性进行了研究,提出了以Ba2+为中心的近八配位十二面体和以Y3+为中心的近八配位十二面体是晶体生长的基元。并根据自发结晶的BaY2F8的XRD,说明了BaY2F8晶体的{200}、{130}、{021}、{330}、{-111}、{111}、{221}、{002}等面族比较发育的原因。本文证实了仲维卓的负离子配位多面体理论对BaY2F8晶体生长的适用性,并对探索新的BaY2F8单晶生长方法有参考作用。Based on the theoretical model of anionic coordination polyhedron growth unit and analyzed the crystal structure of BaY2F8 , the crystallization habit of BaY2F8 from the spontaneous cooling was studied in this paper. And it is presented the growth unites of BaY2F8 are eight-fold dodecahedral polyhedron with Ba^2＋ center and eight-fold dodecahedral polyhedron with Y^3＋ center. Two kinds polyhedrons＇ superposition formed BaY2F8 crystal. Using its XRD, making clear why {200}, {130}, {021}, {330}, { -111}, {111}, {221} and {002} faces are more growth. These things support with proof of applicability to the BaY2F8 crystal growth by anionic coordination polyhedron, and indicate a new growth method of BaY2F8 crystal in theory.

关 键 词：自发结晶 负离子配位多面体 自发成核 生长速率 生长基元 

分 类 号：O78[理学—晶体学]