BaY2F8晶体生长基元与结晶机理的探讨

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.

Discussion about the Growth Unit and Crystallization Mechanism of BaY2F8

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 Ba2 center and eight-fold dodecahedral polyhedron with Y3 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.