Interfacial disconnections at Sb_2Te_3 precipitates in PbTe: Mechanisms of strain accommodation and phase transformation at a tetradymite/rocksalt telluride interface
- Creators
- Heinz, N. A.
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Ikeda, T.
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Snyder, G. J.
- Medlin, D. L.
Abstract
Understanding the structure and formation mechanisms of interfaces between different telluride phases is important to the development of thermoelectric nanocomposites. Here, we investigate the interfacial structure of tetradymite precipitates in a rocksalt telluride matrix, focusing in particular on precipitates of Sb_2Te_3 in PbTe. Using high-resolution transmission electron microscopy, we investigate the structure and arrangement of interfacial disconnections—i.e. interfacial steps possessing dislocation character—observed in this system. Our analyses provide insight concerning the roles of these defects in accommodating the large interfacial misfit (6.7%) in this system and in mediating the transformation from the rocksalt to the tetradymite structure. Our observations also suggest how such interfacial disconnections could arise through the dissociation of crystal lattice dislocations that accommodate the misfit on initially flat segments of the interface.
Additional Information
© 2011 Acta Materialia Inc. Published by Elsevier Ltd. Received 23 July 2011; received in revised form 25 August 2011; accepted 27 August 2011. Available online 15 October 2011. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the US Department of Energy's National Nuclear Security Administration under contract DE-AC04- 94AL85000. Support for this project was provided in part by the Sandia LDRD office. The authors thank Joshua D. Sugar for useful discussions and helpful comments on the manuscript.Additional details
- Eprint ID
- 28644
- DOI
- 10.1016/j.actamat.2011.08.043
- Resolver ID
- CaltechAUTHORS:20120104-103958824
- Department of Energy (DOE) National Nuclear Security Administration
- DE-AC04-94L85000
- Sandia LDRD office
- Created
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2012-01-04Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field