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Proceedings Paper

Double-diffusive convection during growth of lead bromide crystals
Author(s): N. B. Singh; S. R. Coriell; Walter M. B. Duval; Ching-Hua Su; M. E. Glicksman; T. Rajalakshmi; A. M. Stewart
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Paper Abstract

Experiments were performed in controlled conditions to understand both morphological and convective instabilities and results were compared with the theoretical calculations. The sharp contrast between the solid (yellow) and the liquid (bright red) phases makes this transparent lead bromide a very suitable material for such an investigation. Crystals doped with 5000 ppm silver bromide were grown. The experimental observations agree with the preliminary results of the numerical prediction. Further, toroidal instabilities resulting from double diffusive convection were observed during crystal growth. Crystals for these interfacial observations were grown in a two zone vertical Bridgman furnace. The acoustic properties were better in doped rather than undoped crystals. Crystals were characterized by x-ray rocking curves and contour scans. Crystals grown at lower Rayleigh numbers showed better quality than crystals grown at higher Rayleigh numbers.

Paper Details

Date Published: 7 July 1997
PDF: 12 pages
Proc. SPIE 3123, Materials Research in Low Gravity, (7 July 1997); doi: 10.1117/12.277734
Show Author Affiliations
N. B. Singh, Northrop Grumman Corp. (United States)
S. R. Coriell, National Institute of Standards and Technology (United States)
Walter M. B. Duval, NASA Lewis Research Ctr. (United States)
Ching-Hua Su, NASA Marshall Space Flight Ctr. (United States)
M. E. Glicksman, Rensselaer Polytechnic Institute (United States)
T. Rajalakshmi, Northrop Grumman Corp. (United States)
A. M. Stewart, Northrop Grumman Corp. (United States)

Published in SPIE Proceedings Vol. 3123:
Materials Research in Low Gravity
Narayanan Ramachandran, Editor(s)

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