Three-dimensional analysis of flow and segregation in vertical Bridgman crystal growth under axial and transversal magnetic fields
Resource
Journal of Crystal Growth 254(3-4), 503–515
Journal
Journal of Crystal Growth 254(3-4), 503–515
Pages
-
Date Issued
2003
Date
2003
Author(s)
Lan, C.W.
Lee, I.F.
Yeh, B.C.
DOI
246246/2006111501233476
Abstract
Three-dimensional simulation, both pseudo-steady and time-dependent states, is carried out to illustrate the effects of
magnetic fields on the flow and segregation in a vertical Bridgman crystal growth. With an axial magnetic field in a
perfectly vertical growth, the calculated results are in good agreement with those obtained by a two-dimensional
axisymmetric model. The asymptotic scalingof flow damping is also consistent with the boundary layer approximation
regardless to the magnetic orientation. Radial and axial segregations are further discussed concluding that radial
segregation could be severe if the flow damping is not adequate. Moreover, there is a regime of enhanced global dopant
mixingdue to the flow stretchingby the axial field. Accordingly, the transversal field is more effective in pushingthe
growth to the diffusion-controlled limit and suppressing the asymmetric global flow due to ampule tilting.
r 2003 Elsevier Science B.V. All rights reserved.
Subjects
A1. Computer simulation
A1. Convection
A1. Directional solidification
A1. Fluid flows
A1. Heat transfer
A1. Interfaces
A1. Magnetic fields
A1. Segregation
A2. Bridgman technique
A2. Gradient freeze technique
A2. Growth
from melt
from melt
A2. Single crystal growth
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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