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Flight Experiment to Study Double-Diffusive Instabilities in Silver-Dopped Lead Bromide CrystalsThe main objective of the present program is to understand thermosolutal convection during crystal growth of PbBr2-AgBr alloys. This involves identification of the growth conditions for microgravity experiments delineating the microsegregation, observation of convecto-diffusive instabilities and comparison with theoretical models. The overall objectives can be summarized as follows: 1. Observe and study the double diffusive and morphological instabilities in controlled conditions and to compare with theoretically predicted convective and morphological instability curves. 2. Study the three-dimensional morphological instabilities and resulting cellular growth that occur near the onset of morphological instability in the bulk samples under purely diffusive conditions. 3. Understand the micro-and macro-segregation of silver dopant in lead bromide crystals in microgravity. 4. Provide basic data on convective behavior in alloy crystals grown by the commercially important Bridgman crystal growth process.
Document ID
20010057316
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Singh, N. B.
(Northrop Grumman Corp. Linthicum, MD United States)
Adam, J. D.
(Northrop Grumman Corp. Linthicum, MD United States)
Zhang, Hui
(Northrop Grumman Corp. Linthicum, MD United States)
Coriell, Sam. R.
(National Inst. of Standards and Technology Gaithersburg, MD United States)
Duval, Walter M. B.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
August 20, 2013
Publication Date
March 1, 2001
Publication Information
Publication: Microgravity Materials Science Conference 2000
Volume: 3
Subject Category
Solid-State Physics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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