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本文从结晶化学角度出发，研究了ＬｉＮｂＯ＿３（ＬＮ）晶体的生长机理。根据对ＬＮ熔体结构的测试资料和晶体生长过程中生长脊的显露规律，提出ＬＮ晶体的生长基元为Ｎｂ－Ｏ＿６八面体和通过Ｌｉ离子把两个Ｎｂ－Ｏ＿６八面体连接在一起形成一个维度更大一级的生长基元。由于不同温度条件下所形成的生长基元维度不同，所以各生长基元往晶体各个面族上的叠合速率亦不相同。结晶过程中Ｎｂ－Ｏ＿６和Ｌｉ－Ｏ＿６八面体连接的难易遵守着鲍林定律关于负离子配位多面体相互连接的稳定性所决定的。｛１０－１２｝面族Ｎｂ－Ｏ＿６和Ｌｉ－Ｏ＿６八面体相互间是以顶角相连接，故稳定性最好，该面族生长速率最快，在拉晶过程中是以突起的生长脊为显露特征。
In this paper, the growth mechanism of LiNbO_3 (LN) crystal was studied from the perspective of crystallization chemistry. According to the test data of LN melt structure and the revealing rules of growth ridges during crystal growth, it is proposed that the growth element of LN crystal is Nb-O_6 octahedron and the two Nb-O_6 octahedra are connected together by Li ion to form a The growth dimension of a larger dimension. Due to the different growth of the growth of the primitive element under different temperature conditions, so the growth of each unit to the crystal surface of the superposition rate is not the same. The difficulty of the octahedral connection of Nb-O 6 and Li-O 6 in the crystallization process is governed by the Pauling’s law about the stability of the interconnection of the coordination polyanions. The {10-12} facet Nb-O_6 and Li-O_6 octahedra are connected by the vertex angle, so the stability is the best, and the growth rate of the face group is the fastest. During the pulling process, the protruding growth ridges To reveal the characteristics.