Segregation in Pb1−xSnx Te during solidification by the Bridgman technique

The influence of the growth parameters on the concentration gradient of Pb_1–xSn_xTe monocrystals grown by the vertical Bridgman technique is described. The concentration profiles of all three constituents (Pb, Sn, Te) have been analysed in ingots having different Pb-Sn ratios and grown under different conditions. The presumed role played by free convection in the Pb-Sn ratio is shown. Te was found to be constant in all ingots and not dependent upon the growth conditions.