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本文论述了无对流混合和完全混合两种标准冷凝生长型式的理论预测。为了反映这些生长条件对Hg_(1-x)Cd_xTe(MCT)系统的影响,设计了两种温度分布,并采用一定范围的生长速率和原始组份,生长得了晶体。把这些晶体中得到的轴向和径向组分的均匀性与两种生长型式的预测作了比较。本文还讨论等温线形状、径向分凝、密度引起的对流和温度分布产生的对流对径向组分均匀性的相对影响。发现径向组分的变化随生长速度的降低而减小,并且发现在说明轴向组分分布时,必须要考虑到这些改变。认为:密度引起的对流是决定径向组分变化的最重要因素。同时可以看到,在等温线的作用和径向分凝可以忽略的条件下,由温度分布引起的对流对径向组分的变化的影响。
This paper discusses the theoretical prediction of two standard condensation growth modes, convection-free mixing and complete mixing. To reflect the effect of these growth conditions on the Hg_ (1-x) Cd_xTe (MCT) system, two temperature profiles were designed and grown with a range of growth rates and primary components. The homogeneity of the axial and radial components obtained in these crystals was compared with the prediction of the two growth patterns. The paper also discusses the relative influence of convection caused by isotherm shape, radial dendrite, density-induced convection and temperature distribution on the uniformity of radial components. It was found that the variation of the radial component decreases with decreasing growth rate and that these changes have to be taken into consideration when describing the axial component distribution. It is considered that density-induced convection is the most important factor that determines the change of radial components. At the same time, it can be seen that the influence of convection on the variation of radial components caused by the temperature distribution under the action of isotherm and the negligible radial segregation.