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Directional Solidification and Characterization of Hg1−xCdxTe Alloys*

Published online by Cambridge University Press:  15 February 2011

S. L. Lehoczky  and
F. R. Szofran
S. L. Lehoczky
Affiliation:
McDonnell Douglas Research Laboratories, McDonnell Douglas Corporation St. Louis, Missouri 63166 USA
F. R. Szofran
Affiliation:
McDonnell Douglas Research Laboratories, McDonnell Douglas Corporation St. Louis, Missouri 63166 USA
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Abstract

A series of Hg1−xCdxTe alloy crystals was grown by high-temperature-gradient directional solidification at furnace translation rates ranging from 0.068 to 1.12 μm/s. For several ingots, the measured longitudinal compositional profiles were fitted to theoretical profiles to estimate the magnitude of D, the liquid HgTe-CdTe interdiffusion coefficient. The best-fit value of D was about 5.5 × 105 cm2/s. The majority of the ingots showed significant radial compositional variations along the growth axis. These variations are attributed, at least in part, to fluid flows ahead of the growth interface. The results are discussed in terms of the heat transfer characteristics of the alloy/ampule/ furnace system and the effects of these characteristics on the shape and stability of the growth interface in a 1-g environment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 9 , 1981 , 409
Copyright
Copyright © Materials Research Society 1982

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References

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