熔体晶体生长的实时观察研究  

IN situ Observation of Crystal Growth from High Temperature Melts

作　　者：袁晖[1] 金蔚青[1] 程宁[1] 潘志雷[1] 

机构地区：[1]中国科学院上海硅酸盐研究所

出　　处：《人工晶体学报》1995年第3期175-181,共7页Journal of Synthetic Crystals

基　　金：国家科学技术委员会攀登计划资助;中国科学院高性能陶瓷和超微结构国家重点实验室和国家自然科学基金

摘　　要：本文提供了实时观察高温熔体晶体生长的新方法。此方法是将休伦（Ｓｃｈｌｉｅｒｅｎ）技术和微分干涉显微镜（ＤＩＭ）技术相结合，能同时观察到晶体生长中的表面动力学过程和生长界面处的输运现象。在ＫＮｂＯ＿３熔体晶体生长中的生长图案和输运现象首次被同时观察到。改变熔体层厚度和熔体平面方向与重力场方向的夹角，得到了不同的流动形貌。通过阻抑浮力对流，对表面张力对流也进行了观察研究。A high temperature in situ observation method has been newly developed by coupling differential interference microscope(DIM)with the Schlieren method.The method aims at observing and recording the whole process of growing and melting of oxide crystals in high temperature up to 1400℃, with very high visibility of surface kinetic processes and mass flow behaviors near the growing interface. The diffusion boundary layer around the crystal and buoyancy-driven convection has been observed for the first time in the color Schlieren photographs of growing KNbO_3 crystals. Buoyancy driven convection behaves differently under different conditions of the thickness of melts and the direction of melts plane,A simple periodic oscillatory mode associated with wave motion of the thermocapillary convection has also been observed under suppressing buoyancy convection.

关 键 词：实时观察 熔体晶体生长 高温熔体 对流 氧化物晶体 

分 类 号：O743.3[理学—晶体学] O766