Interfacial disconnections at Sb2Te3 precipitates in PbTe: Mechanisms of strain accommodation and phase transformation at a tetradymite/rocksalt telluride interface

N. A. Heinz, T. Ikeda, G. J. Snyder, D. L. Medlin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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 Sb2Te3 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.

Original languageEnglish (US)
Pages (from-to)7724-7735
Number of pages12
JournalActa Materialia
Volume59
Issue number20
DOIs
StatePublished - Dec 2011

Keywords

  • Dislocations
  • High-resolution transmission electron microscopy (HRTEM)
  • Interface structure
  • Phase transformations
  • Thermoelectric materials

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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