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Numeric simulation of vertical Bridgman growth of Cd_1-xZn_xTe melts

机译：Cd_1-xZn_xTe熔体垂直Bridgman生长的数值模拟

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摘要

The regulrities of thermal field formation in the melt/crystal system during the vertical Bridgman growth of Cd_1-xZn_xTe crystals have been studied as functions of process parameters. The thermal field in the melt-crystal system has been determined by jointly solving the generalised equation of convective heat conductivity and the Navier-Stokes equations. This conjugated problem has been solved using the efficient method of projective calculation of the Stefan problem and the method of balance for the constructing of difference patterns on irregular meshes Fryazinov, Differential Equations 16(7) 1980 1332; Preprints Inst. Prickl. Matem. Im Keldysha, Moscow, No. 120, 1980. The range of experimental parameters has been chosen in a way for the heat exchange of the ampoule with the environment to occur by radiation. At an early stage of growth, heat removal through the ampoule bottom dominated. This favoured the formation of isotherms with shapes convex towards the melt crystallisation. We have found regions concave towards the melt in these isotherms and discuss the origins of such behaviour. direct c 1999 Elsevier Science B.V. All rights reserved.
机译：研究了Cd_1-xZn_xTe晶体在垂直Bridgman生长过程中在熔体/晶体系统中形成的热场的规律，该规律是工艺参数的函数。通过共同求解对流热导率的通用方程和Navier-Stokes方程，可以确定熔融晶体系统中的热场。共轭问题已通过使用有效的Stefan问题的投影计算方法和在不规则网格上构造差异模式的平衡方法来解决。Fryazinov，微分方程16（7）1980 1332;预印本刺Matem。 Im Keldysha，莫斯科，第120号，1980年。实验参数的范围已选择为通过辐射使安瓿与环境进行热交换。在生长的早期阶段，通过安瓿底部的热量排出占主导。这有利于形成具有向熔体结晶凸出的形状的等温线。我们发现了在这些等温线中向熔体凹入的区域，并讨论了这种行为的起源。直接c 1999 Elsevier Science B.V.保留所有权利。

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