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Study on Cracking of AgGaS_2 Crystal Growth

ZHANG Jian-jun, ZHU Shi-fu, ZHAO Bei-jun, ZHANG Wei, LIU Min-wen, LI Yi-chun, CHEN Bao-jun, LIU Juan,LI Ming (Department of Material Science, Sichuan University , Chengdu 610064, China)  
This paper studies the relationship between the phenomenon of crack and the thermal stress in the AgGaS_2 crystal.On this basis, the parameters of crystal growth such as temperature gradient and the rate of growth, the size of single crystal etc.were also considered, both theoretically and experimentally. The results indicate that the crystal crack is related to the thermal stress and strain which cause by the growth rate,cooling and rotation of the crucible. The preferable technical parameters for growing AgGaS_2 single crystal with crack-free and large size are presented.A integral AgGaS_2 single crystal with diameter of 12mm and the length of 30mm was obtained by the modified Bridgeman method.
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