三硼酸锂（LBO）晶体生长基元与形貌

Growth Unit and Morphology of Lithium Triborate (LBO)

本文采用称重法研究了ＬＢＯ（ＬｉＢ３Ｏ５）晶体中（１００）、（０１０）、（００１）和（０１１）方向的生长速率与溶液过饱和度之间的关系，发现在相同过饱和度的条件下，同一晶体的不同界面上出现了粗糙化相变和二维成核的不同生长机制，这种现象用负离子配位体生长基元的观点得到了圆满的解释。通过对溶液结构的测定，证实了溶液中存在着Ｂ－Ｏ３三角形和Ｂ－Ｏ４四面体结构。它与晶体中的配位结构相同，这两种配位体结合而形成的（Ｂ３Ｏ７）５－与晶体中的络阴离子环相当。环状络阴离子有两个非对称分布的悬键，具有偶极子的特征，正、负相连构成链状结构，与环链垂直的晶面显粗糙化相变的特征，与环链平行的晶面显二维成核的特征。

In this paper studies the relation between the growth rates of LBO crystal and the supersaturation are investigated by the weigh method and the structure of growth solution were detemined by infrared spectrum technique. The growth mechanisms of face (100), (010),(001) and (011 ) and habit of the crystal are well explained by the view Point Of the growth unit with coordination polyhedron structure of anion.