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

这项研究涉及耦合振动搅拌在晶体生长过程中的应用。这项技术是非侵入性的，其工作原理是去除在生长界面分离的不需要的物质，从而提高生长晶体的化学成分的一致性。这项研究考察了该技术的流体动力学方面及其在布里奇曼晶体生长过程中的应用。重点讨论了两个具体的领域：(1)工艺对生长速度、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研究，包括热梯度和热渗透。正在研究的材料体系包括氯化铯、碲化镉、锗和银硒化镓。

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.