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Formation of GaSb core-shell nanofibers by a thermally induced phase decomposition process

Published online by Cambridge University Press:  31 January 2011

Alejandro G. Perez-Bergquist ,
Kai Sun ,
Lumin Wang  and
Yanwen Zhang
Lumin Wang*
Affiliation:
Department of Nuclear Engineering and Radiological Sciences and Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
Yanwen Zhang
Affiliation:
Pacific Northwest National Laboratory, Richland, Washington 99352
*
a) Address all correspondence to this author. e-mail: lmwang@umich.edu
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Abstract

Dense networks of amorphous GaSb nanofibers were fabricated by ion irradiation of bulk GaSb, and following formation, they were thermally annealed at a low temperature. Contrary to expectations, annealing of the GaSb fibers at just 50% of their melting temperature resulted in complete chemical decomposition of the nanofibers into core-shell structures consisting of crystalline Sb cores surrounded by amorphous shells. In this study, we investigate the transition of the single-phase nanofibers to their core-shell configuration, and we analyze the unique, temperature-dependent phase decomposition process. Thermodynamic considerations are discussed, and a model is presented to explain the thermally induced decomposition of the GaSb semiconductor fibers into core-shell structures, based upon the singular interaction of several size-dependent material properties.

Keywords

Core/shellPhase transformationTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2286 - 2292
Copyright
Copyright © Materials Research Society 2009

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