Interfacial disconnections at Sb2Te3 precipitates in PbTe / N.A. Heinz in Acta materialia, Vol. 59 N° 20 (Décembre 2011)  

Public ISBD [article]  inActa materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7724–7735 Titre : Interfacial disconnections at Sb2Te3 precipitates in PbTe : Mechanisms of strain accommodation and phase transformation at a tetradymite/rocksalt telluride interface Type de document : texte imprimé Auteurs : N.A. Heinz, Auteur ; T. Ikeda, Auteur ; G.J. Snyder, Auteur Année de publication : 2012 Article en page(s) : pp. 7724–7735 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Interface structure Phase transformations Dislocations High-resolution transmission electron microscopy (HRTEM) Thermoelectric materials Résumé : 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. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006203 [article] Interfacial disconnections at Sb2Te3 precipitates in PbTe : Mechanisms of strain accommodation and phase transformation at a tetradymite/rocksalt telluride interface [texte imprimé] / N.A. Heinz, Auteur ; T. Ikeda, Auteur ; G.J. Snyder, Auteur . - 2012 . - pp. 7724–7735. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7724–7735 Mots-clés : Interface structure Phase transformations Dislocations High-resolution transmission electron microscopy (HRTEM) Thermoelectric materials Résumé : 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. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006203

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