Open Access<title>Convective influence on radial segregation during unidirectional solidification of the binary alloy HgCdTe</title>
Author(s) -
Dale A. Watring,
Donald C. Gillies,
S. L. Lehoczky,
Frank R. Szofran,
Helga A. Alexander
Publication year - 1996
Publication title -
proceedings of spie, the international society for optical engineering/proceedings of spie
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.192
H-Index - 176
eISSN - 1996-756X
pISSN - 0277-786X
DOI - 10.1117/12.244358
Subject(s) - convection , directional solidification , materials science , alloy , crystal growth , magnetic field , crystal (programming language) , mass transfer , mixing (physics) , condensed matter physics , crystallography , chemistry , mechanics , physics , metallurgy , quantum mechanics , computer science , programming language
In order to stimulate the space environment for basic research into the crystal growth mechanism, Hg0.8Cd0.2Te crystals were grown by the vertical Bridgman- Stockbarger method in the presence of an applied axial magnetic field. The influence of convection, by magneto hydrodynamic damping, on mass transfer in the melt and segregation at the solid-liquid interface was investigated by measuring he axial and radial compositional variations in the grown samples. The reduction of convective mixing in the melt through the application of the magnetic field is found to have a large effect on radial segregation and interface morphology in the grown crystals. Direct comparisons are made with a Hg0.8Cd0.2Te crystal grown without field and also in the microgravity environment of space during the second United States Microgravity Payload Mission.
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