Segregation effects during growth of pseudo-binary systems with large liquidus-solidus separation

E. D. Bourret, J. J. Derby, R. A. Brown, A. F. Witt

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The transport phenomena associated with melt-growth of semi-conductor crystals on Earth and in space were investigated for non-dilute pseudo-binary systems with large liquidus-solidus separation. In these systems, heat and mass transfer are coupled through the dependence of the melting point on composition and the presence of thermosolutal convection. Experimental growth studies of PbSnTe in a vertical Bridgman configuration involving melts with initial aspect ratios of 15 and 6.8 exhibit axial and radial Sn segregation indicative of intensive convective mixing in the melt. The present findings point to the need for more precise thermal field control in crystal growth and suggest growth in a microgravity environment if diffusion controlled conditions are to be achieved. An analysis of heat and mass transfer for an idealized Bridgman growth system has been made and gives predictions for the dynamics that can be expected in such a space experiment.

Original languageEnglish (US)
Pages (from-to)163-171
Number of pages9
JournalActa Astronautica
Volume11
Issue number3-4
DOIs
StatePublished - 1984

Bibliographical note

Funding Information:
Acknowledgement--Financial support of this research by the National Aeronautics and Space Administration (Reference No. NSG-7645) is gratefully acknowledged.

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