Coupled Vibrational Stirring: A New Method for Stirring Melts and Solutions during Crystal Growth

本研究涉及在晶体生长过程中耦合振动搅拌的使用。该技术是非侵入性的，其工作原理是去除生长界面上不需要的分离物质，从而提高生长晶体化学成分的均匀性。该研究考察了该技术的流体动力学方面及其在Bridgman晶体生长过程中的应用。重点关注两个方面：(1)技术对生长速度、生长界面形状、化学均匀性和缺陷形成的影响；(2)晶体生长过程中质量和热输运的参数化研究，包括热梯度和热振荡。正在研究的材料系统包括氯化镉铯、碲化镉、锗和硒化镓银。

This research is concerned with the use of coupled vibrational stirring during the growth of crystals. The technique is non- invasive, and works on the principle of removal of unwanted species segregating at the growth interface, thereby leading to improved uniformity of chemical composition of the growing crystal. The research examines the fluid dynamic aspects of the technique and its aplication to the Bridgman crystal growth process. Two specific areas are being emphasized: (1) effects of the technique on rate of growth, shape of the growth interface, chemical homogeneity, and formation of deffects, (2) parametric study of the mass and thermal transport during crystal growth, inclufing thermal gradients and thermal ossilations. THe materials systems being studied incllude cesium cadmium chloride, cadmium telluride, germanium, and silver gallium selenide.