【摘要】 本文详细观测了沿Z、Y、X、R、MC等五个不同晶轴方向提拉生长的LiTaO₃单晶的生长形态。特别注意到出现在晶体表面呈浮雕状的形貌（生长脊和晶面显露）。研究了这些形貌的空间分布规律性以及和扩肩角θ的关系。从晶体对称性和简单指数晶面族按面网密度小先尖灭的原理出发,结合提拉法晶体生长过程的分析,说明了生长形态的形成机制,指出R晶面族在生长丘发育成生长脊或晶面显露中的决定作用,提出原胞模型来唯象说明各种取向的LiTaO₃单晶的生长形态,那些出现生长脊或晶面显露的特征性方位是原胞顶点没提拉轴方向投影到垂直提拉轴平面上的方位。所得结果与实验观测结果相符。更多还原

【Abstract】 The growth habit of LiTaO₃, especially the distribution of growth ridges and facetson crystal surfaces has been studied in details.The mechanism of formation of the mor-phological features is discussed phenomenologically on the basis of structure model ofunit cell and the appearance of these features explained in the light of structural sym-metry of LiTaO₃ crystals. The calculated results of the model coincide fairly well withthe experimental data obtained.更多还原