Abstract
Horizontal casting of Hg 1- x Cd x Te (mercury cadmium telluride — MCT) ingots for solid state recrystallization (SSR) is demonstrated. This has resulted in a marked improvement in compositional uniformity and crystalline perfection of SSR grown MCT ( x ≈ 0.22) crystals. Large chunks having x-variation in the range of ±0.002 were obtained. X-ray topographic and defect etching studies of these crystals reveal that only little subgrain microstructure is present in the major portions of these ingots as compared to the severe substructure observed in the bulk grown MCT crystals. It has been proposed that the large number of misfit dislocations arising due to microscopic compositional variations present in the casts are responsible for the recrystallization in MCT SSR process. It is also argued that the existance of large stoichiometric deviations in MCT at the growth temperatures might be a main cause for the excessive subgrain microstructure observed in bulk grown MCT crystals.
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