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Chemical Vapor Transport and Crystal Growth of the Hg 0.8 Cd 0.2 Te System, Crystal Morphology and Homogeneity
Author(s) -
Wiedemeier H.,
Chandra D.
Publication year - 1982
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19824880118
Subject(s) - homogeneity (statistics) , convection , crystal (programming language) , mass transport , ampoule , mass transfer , materials science , analytical chemistry (journal) , crystallography , temperature gradient , chemistry , thermodynamics , meteorology , chromatography , physics , statistics , mathematics , engineering physics , computer science , programming language
Mass transport rate studies of the system Hg 1−x Cd x Te‐iodine (with x = 0.2 for the source material) are performed in the temperature gradient 590° → 535°C as a function of transport agent pressure and for different orientations of the density gradient relative to the gravity vector. The combined results reveal that convection, even when not sufficient to increase the diffusive mass transport rates appreciably at low pressures, affects the surface morphology and compositional homogeneity of crystals. Under vertical, stabilizing conditions, the crystallographic and chemical homogeneity of crystals is distinctly improved relative to those obtained for the horizontal orientation of the transport ampoule. These result suggest that elimination of convection (micro‐g environment) may yield a further improvement of crystals.