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Interfacial disconnections at Sb_2Te_3 precipitates in PbTe: Mechanisms of strain accommodation and phase transformation at a tetradymite/rocksalt telluride interface

Heinz, N. A. and Ikeda, T. and Snyder, G. J. and Medlin, D. L. (2011) Interfacial disconnections at Sb_2Te_3 precipitates in PbTe: Mechanisms of strain accommodation and phase transformation at a tetradymite/rocksalt telluride interface. Acta Materialia, 59 (20). pp. 7724-7735. ISSN 1359-6454. https://resolver.caltech.edu/CaltechAUTHORS:20120104-103958824

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.actamat.2011.08.043DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/S1359645411006203PublisherUNSPECIFIED
ORCID:
AuthorORCID
Ikeda, T.0000-0001-7076-6958
Snyder, G. J.0000-0003-1414-8682
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.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE) National Nuclear Security Administration DE-AC04-94L85000
Sandia LDRD officeUNSPECIFIED
Subject Keywords:Interface structure; Phase transformations; Dislocations; High-resolution transmission electron microscopy (HRTEM); Thermoelectric materials
Issue or Number:20
Record Number:CaltechAUTHORS:20120104-103958824
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120104-103958824
Official Citation:N.A. Heinz, T. Ikeda, G.J. Snyder, D.L. Medlin, Interfacial disconnections at Sb2Te3 precipitates in PbTe: Mechanisms of strain accommodation and phase transformation at a tetradymite/rocksalt telluride interface, Acta Materialia, Volume 59, Issue 20, December 2011, Pages 7724-7735, ISSN 1359-6454, 10.1016/j.actamat.2011.08.043. (http://www.sciencedirect.com/science/article/pii/S1359645411006203)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28644
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:04 Jan 2012 19:42
Last Modified:03 Oct 2019 03:34

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