Atomic force microscopy studies on liquid inclusions and induced defects of cadmium mercury thiocyanate crystal by X. N. Jiang, D. Xu

Crystal Research and Technology

Cryst. Res. Technol. 38, 767 (2003) - Abstract -

Atomic force microscopy studies on liquid inclusions and induced defects of cadmium mercury thiocyanate crystal

X. N. Jiang, D. Xu*

State Key Laboratory for Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116023, People’s Republic of China
*State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, People’s Republic of China

Keywords	cadmium mercury thiocyanate crystal, atomic force microscopy, liquid inclusions, dislocations and cracks, screw dislocation growth
PACS	42.70.M, 61.72.D, 61.16.Ch
DOI	10.1002/crat.200310093

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.

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