Metallic Inclusions and Cellular Substructure in Pb[sub 1?x]Sn[sub x]Te Single Crystals

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Abstract
Electrolytic etching has revealed metallic inclusions and a cellular substructure in a number of single crystals. The existence of metallic inclusions and cellular substructure in the interior of some Bridgman‐grown crystals is explained by the mechanism of constitutional supercooling. Metallic surface inclusions, which are possibly due in part to reaction with the quartz growth vessel, were observed on as‐grown surfaces of Bridgman‐ and vapor‐grown crystals. Growth conditions have been found which result in crystals free of bulk metallic inclusions and cellular substructure