论文部分内容阅读
本文研究了热液条件下ＢＧＯ（Ｂｉ＿（１２）ＧｅＯ＿（２０）．Ｂｉ＿４Ｇｅ＿３Ｏ＿（１２））微粒结晶习性形成机理。根据热液条件下晶体生长基元为负离子配位多面体结构的理论模型，设计了生长ＢＧＯ晶粒时Ｂｉ－Ｏ＿６八面体和Ｇｅ－Ｏ＿４四面体的比例和生长工艺。制备出结晶完好的晶粒，提出Ｇｅ－Ｏ＿４四面体结晶方位与各个面族之间的显露规律。Ｂｉ＿（１２）ＧｅＯ＿（２０）晶体中｛１１１｝面族顽强显露，晶粒呈三次对称，表现出极性晶体的生长特征。Ｂｉ＿４Ｇｅ＿３Ｏ＿（１２）晶粒为五角二十四面体｛３２１｝，呈球形，根据生长基元为Ｇｅ－Ｏ＿４四面体和Ｂｉ－Ｏ＿６八面体与晶粒各个面族上Ｇｅ－Ｏ＿４四面体和Ｂｉ－Ｏ＿６八面体连接的稳定性，解释了晶粒的结晶习性机理。
In this paper, the formation mechanism of the crystallization behavior of BGO (Bi 12 GeO 20 and Bi 4 Ge 3 O 12) particles in hydrothermal solution was studied. According to the theoretical model that the crystal growth unit is an anion coordination polyhedron structure under hydrothermal conditions, the proportions and growth processes of Bi-O_6 octahedrons and Ge-O_4 tetrahedrons for growing BGO grains are designed. Preparation of crystal intact grains, proposed Ge-O_4 tetrahedron crystallographic orientation and the various surface race between the exposed rules. The {111} family of noodles in Bi 12 GeO 20 crystal show tenaciously symmetrical grains showing the growth characteristics of polar crystals. The crystal of Bi_4Ge_3O_ (12) is pentagonal tetrahedron {321}, which is spherical. According to the growth primitives, Ge-O_4 tetrahedrons and Bi-O_6 octahedrons and the Ge- The stability of the O_6 octahedral connection explains the crystal habit mechanism of the crystal grains.