Method of preparing radially homogenous mercury cadmium tellurid

Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step

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1566164, 422249, C30B 106, C30B 108

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active

048635537

ABSTRACT:
Hg.sub.1-x Cd.sub.x Te is prepared in an improved directional solidification method in which a precast alloy sample containing predetermined amounts of Hg, Cd and Te is disposed in a sealed ampule (12) and a furnace (10) providing two controlled temperature zones (16, 18) is translated upward past the ampule so as to provide melting and resolidification. The present improvement is directed to maintaining the zones at temperatures determined in accordance with a prescribed formula providing a thermal barrier (32) between the zones with a maximum thickness and translating the furnace past the zones at a rate less than 0.31 .mu.m/sec.

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patent: 3986837 (1976-10-01), Sugiyama et al.
patent: 4050905 (1977-09-01), Swinehart
Bartlett et al; The Effects of Growth Speed on the Compositional Variations in Crystals of CdHgTe, J of Crystal Growth 46 (1979), 623-629.
Fiorito et al; A Possible Method for the Growth of Homogeneous Mercury Cadmium Telluride Single Crystals; J. Electrochem. Soc., vol. 125, No. 2 (Feb. '78) 315-317.
Lawson; A Method of Growing Single Crystals of Lead Telluride and Lead Selenide, J. of Appl. Phys., vol. 22, No. 12 (Dec. '51) 1444-1447.
Lawson et al; Preparation of Single Crystals, 1958, p. 13-30.

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