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论文类型：期刊论文

发表时间：2003-01-01

发表刊物：CRYSTAL RESEARCH AND TECHNOLOGY

收录刊物：SCIE、EI

卷号：38

期号：9

页面范围：767-772

ISSN号：0232-1300

关键字：cadmium mercury thiocyanate crystal; atomic force microscopy; liquid inclusions; dislocations and cracks; screw dislocation growth

摘要：Liquid inclusions and various defects accordingly induced on a nonlinear optical material of CMTC crystal were investigated by atomic force microscopy. Liquid inclusions are chiefly caused by formation of macrosteps, which result from impurity-induced inhibiting of step growth and meeting of step trains advancing along different directions. Liquid inclusions induce generation of dislocations and even cracks within the crystal by three-dimensional nucleation growth. Liquid inclusions also provide screw dislocation growth sources, leading to formation of spiral hillock trains with ridged tails. Etching experiments reveal circular hollow cores, indicative of screw dislocation growth, and negative crystals resulting from further crystallization in the liquid inclusions.