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为了了解勾形磁场下相关参数对CdZnTe晶体生长的影响,利用有限元法对坩埚内的热量和动量传递过程进行了全局数值模拟。分析了不同的磁场强度下重力水平、壁面温度梯度对CdZnTe晶体生长过程的影响。结果表明:重力水平存在1个临界值,此时CdZnTe熔体内最大流函数最小,流动最弱。随着温度梯度逐渐增大,熔体内最大流函数也逐渐增大,熔体的流动越来越强,不利于晶体稳定生长。通过施加勾形磁场,能有效抑制熔体内的流动,有利于晶体的稳定生长,为地面条件下制备大尺寸CdZnTe晶体创造了条件。
In order to understand the influence of the related parameters on the growth of CdZnTe crystals, the global numerical simulation of the heat and momentum transfer in the crucible was carried out by using finite element method. The effects of gravity and wall temperature gradient on the growth of CdZnTe crystals were analyzed under different magnetic field intensities. The results show that there is a critical value at the gravity level. At this time, the maximum flow function of CdZnTe melt is the smallest and the flow is the weakest. With the gradual increase of temperature gradient, the maximum flow function in the melt also gradually increases, and the flow of the melt becomes stronger and stronger, which is not conducive to the stable growth of crystals. By applying a hook-shaped magnetic field, the flow in the melt can be effectively suppressed, which is favorable for the stable growth of the crystal, which provides the conditions for preparing large-size CdZnTe crystals under the ground conditions.