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The Mechanism of Twinning in Zincblende Structure Crystals: New Insights on Polarity Effects From a Study of Magnetic Liquid Encapsulated Czochralski Grown Inp Single Crystals

Published online by Cambridge University Press:  10 February 2011

M. Dudley ,
B. Raghothamachar ,
Y. Guo ,
X. R. Huang ,
H. Chung ,
D. J. Larson Jr. ,
D. T. J. Hurle ,
D. F. Bliss ,
V. Prasad  and
Z. Huang
M. Dudley
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275, USA
B. Raghothamachar
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275, USA
Y. Guo
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275, USA
X. R. Huang
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275, USA
H. Chung
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275, USA
D. J. Larson Jr.
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275, USA
D. T. J. Hurle
Affiliation:
H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
D. F. Bliss
Affiliation:
USAF Research Laboratory, Hanscom AFB, MA 01731
V. Prasad
Affiliation:
Dept. of Mechanical Engineering, SUNY at Strony Brook, NY 11794-2300, USA
Z. Huang
Affiliation:
James Franck Institute, University of Chicago, Chicago IL 60637
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Abstract

Synchrotron White Beam X-ray Topography (SWBXT) and synchrotron X-ray anomalous scattering have been employed to determine the polarity of {111} edge facets, anchored to the three phase boundary (TPB) on which twinning is observed to nucleate in Magnetic Liquid Encapsulated Czochralski (MLEC) grown sulfur doped, <001> InP single crystals. Analysis of the results indicates that both the formation of edge facets and the nucleation of twins occur preferentially on {1 1 1}P faces. Of the four possible sets of edge facets, belonging to the {1 1 1}P form, which are oriented so as to be thermodynamically favored to be anchored to the TPB, two can give rise to a {115} to {1 1 1}P external shoulder facet conversion upon twinning, while the other two can give rise to a {114} to {110} conversion. For these cases, twinning is only observed when the {1 1 1}P edge facets are anchored to the TPB in a region where the shoulder angle is close to 74.21° or 70.53°, facilitating the production of the {115} and {114} external shoulder facets, respectively, prior to twinning. These observations are discussed in light of calculated surface energies of the various internal and external facets.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 524: Symposium V – Application of Synchrotron Radiation Techniques…IV , 1998 , 65
Copyright
Copyright © Materials Research Society 1998

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References

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