论文部分内容阅读
晶体在溶解及生长过程中边界层的信息直接影响晶体生长速度和物质输运过程,进而影响晶体质量和生长机制。本文利用相移干涉技术建立了晶体生长过程实时监测系统,对无机盐晶体溶解及生长过程中的边界层信息及物质输运过程进行了实时监测,获得了整个实验过程中的晶体生长速度。实验表明:在溶解过程中,边界层内浓度分布与晶体界面距离呈指数下降关系,边界层内浓度差与晶体溶解速度随时间呈指数减小关系;在结晶过程中,边界层内浓度分布规律与溶解过程相反;边界层内浓度差和晶体生长速度曲线则呈现出先上升再下降最后趋于稳定的规律,且在重力场和物质输运过程的共同作用下,晶体表面会产生浮力对流现象。
The information of the boundary layer during the process of dissolution and growth of crystal directly influences the crystal growth rate and the process of material transport, which in turn affects the crystal quality and growth mechanism. In this paper, a real-time monitoring system of crystal growth process was established by phase-shift interferometry. The boundary layer information and material transport process during the dissolution and growth of inorganic salt crystals were monitored in real time, and the crystal growth rate was obtained during the whole experiment. The experimental results show that in the process of dissolution, the concentration distribution in the boundary layer decreases exponentially with the distance from the crystal interface. The concentration difference in the boundary layer and the dissolution rate of the crystal decrease exponentially with time. During the crystallization, the concentration distribution in the boundary layer Contrary to the dissolution process, the concentration difference in the boundary layer and the growth curve of the crystal show the law of rising and then falling and finally stabilizing. Under the combined action of gravitational field and material transport, buoyancy convection will occur on the crystal surface.