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Physical Vapor Transport of Mercurous Chloride Crystals: Design of a Microgravity ExperimentFlow field characteristics predicted from a computational model show that the dynamical state of the flow, for practical crystal growth conditions of mercurous chloride, can range from steady to unsteady. Evidence that the flow field can be strongly dominated by convection for ground-based conditions is provided by the prediction of asymmetric velocity profiles bv the model which show reasonable agreement with laser Doppler velocimetry experiments in both magnitude and planform. Unsteady flow is shown to be correlated with a degradation of crystal quality as quantified by light scattering pattern measurements, A microgravity experiment is designed to show that an experiment performed with parameters which yield an unsteady flow becomes steady (diffusive-advective) in a microgravity environment of 10(exp -3) g(sub 0) as predicted by the model, and hence yields crystals with optimal quality.
Document ID
19990009610
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Duval, W, M. B.
(NASA Lewis Research Center Cleveland, OH United States)
Singh, N. B.
(Northrop Grumman Corp. Pittsburgh, PA United States)
Glicksman, M. E.
(Rensselaer Polytechnic Inst. Troy, NY United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Journal of Crystal Growth
Publisher: Elsevier Science Publishers
Volume: 174
ISSN: 0022-0248
Subject Category
Solid-State Physics
Distribution Limits
Public
Copyright
Other

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