Structural perfection and mechanical properties of ZnSe_1-xTe_x crystals grown by the Bridgman technique

摘要

preparaion conditions of ZnSe_1-xTe_x crystal should guarantee stability of their scintillation parameters (light output, after glow, luminescence maximum wavelength), optical uniformity, high mechanical strength and resistance to cracking. These crystals were grown by theBridgman techqnieu under different degrees of melt overheating and related evaporation of the more volatile components. Annealing was carried out at 1170-1270 K under zinc vapor and at 1270 K in argon atmosphere. In this paper studies are reported on the influence of the growth parameters on the distribution of Te along the crystal length, the structural perfection of the grown crystals, and their optical and mechanical properties. Wurtzite-sphalerite transformations occurring during isothermal annealing of the crystals and their effects upon resistance to cracking are studied.