Bridgman法晶体生长中的溶质分凝与偏析  

Solute Partition and Segregation in Bridgman Growth Process

作　　者：介万奇[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《中国材料进展》2009年第2期19-25,共7页Materials China

摘　　要：Bridgman法从1925年问世至今,已经演变出多种控制方式,成为金属定向凝固和人工晶体生长的核心技术。由于溶质分凝导致的成分偏析是Bridgman法生长固溶体型晶体材料中遇到的一个难题。本文从溶质分凝的热力学原理和溶质传输的动力学分析入手,探讨了Bridgman法晶体生长过程中溶质分凝和偏析形成的基本原理和规律。进而分析了溶质分凝与温度场的耦合关系以及对流对溶质分凝行为的影响。最后,结合CdZnTe晶体生长过程,分析了溶质分凝与偏析的控制在实际晶体生长过程的应用。Bridgrnan method has been greatly developed and widely used for the unidirectional solidification of metallic materials and single crystal growth of variant functional materials over the 80 years since its initiation. Solute redistribution as well as its resulted concentration segregation is still a vital problem for the Bridgman growth of multi - component crystals, especially for solid solution type of crystals. In the present article, based on the thermodynamic principles and solute transport kinetics, the solute partition and segregation formations in Bridgman growth ingot are analyzed. The interaction between the thermal field and the solute partition behaviors and the effects of convection on the melt are also discussed. Finally, as application examples, our recent research results of the solute partition and segregation in Bridgrnan growth of CdZnTe crystal are presented.

关 键 词：晶体生长 布里奇曼法(Bridgman法) 溶质分凝 分凝因数 成分偏析 

分 类 号：TG146.4[一般工业技术—材料科学与工程]