Parametric study of segregation effects during vertical Bridgman crystal growth with an axial magnetic field

N. Ma, J. S. Walker

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23 Scopus citations

Abstract

This paper presents a model for the unsteady transport of a dopant during the vertical Bridgman crystal growth process with a planar crystal-melt interface and with an axial magnetic field, and investigates the effects of varying different process variables on the crystal composition. The convective mass transport due to the buoyant convection in the melt produces nonuniformities in the concentration in both the melt and the crystal. The convective mass transport plays an important role for all magnetic field strengths considered. Diffusive mass transport begins to dominate for a magnetic flux density of 4 T and a fast growth rate, producing crystals which have an axial variation of the radially averaged crystal composition approaching that of the diffusion-controlled limit. Dopant distributions for several different combinations of process parameters are presented.

Original languageEnglish
Pages (from-to)757-771
Number of pages15
JournalJournal of Crystal Growth
Volume208
Issue number1
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

Funding

This research was supported by the University of Missouri Research Board, by the National Aeronautics and Space Administration under Grant NAG8-1453, and by the National Science Foundation under Grant CTS 94-19484.

FundersFunder number
National Science FoundationCTS 94-19484
National Aeronautics and Space AdministrationNAG8-1453
University of Missouri

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