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Growth and characterization of Hg(1-x)Cd(x)Se alloysA detailed evaluation of the influence of growth conditions on the radial and axial compositional variations in directionally solidified Hg(1-x)Cd(x)Se alloys was performed. The measured axial compositional profiles were fitted to theoretical profiles to determine the effective solute (CdSe) diffusion coefficient (D) for the Hg(1-x)Cd(x)Se system. The value for D was estimated to be 3.0 + or - 0.5 x 10 to the -5th sq cm/s and did not appear to be significantly affected by the rate of crystal growth. The axial crystal uniformity was shown to be highly growth-rate dependent, with the faster growth rates producing crystals of more uniform composition in the axial direction. The magnitude of the radial variations was also shown to be highly growth-rate dependent, with the slower growth rates producing crystals of greater radial uniformity. This translation rate dependence of the radial uniformity is discussed in terms of lateral solute diffusion and convective interfacial fluid flows.
Document ID
19890036114
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Andrews, R. N.
(Alabama, University Birmingham, United States)
Szofran, F. R.
(Alabama Univ. Birmingham, AL, United States)
Lehoczky, S. L.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1988
Publication Information
Publication: Journal of Crystal Growth
Volume: 92
Issue: 3-4,
ISSN: 0022-0248
Subject Category
Solid-State Physics
Accession Number
89A23485
Distribution Limits
Public
Copyright
Other

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