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Phase compositions, nanoscale microstructures and thermoelectric properties in Ag2−ySbyTe1+y alloys with precipitated Sb2Te3 plates / S.N. Zhang in Acta materialia, Vol. 58 N° 12 (Juillet 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4160–4169 Titre : Phase compositions, nanoscale microstructures and thermoelectric properties in Ag2−ySbyTe1+y alloys with precipitated Sb2Te3 plates Type de document : texte imprimé Auteurs : S.N. Zhang, Auteur ; T.J. Zhu, Auteur ; S.H. Yang, Auteur Année de publication : 2011 Article en page(s) : pp. 4160–4169 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Thermoelectric  materials  Thermoelectric  properties  Silver  antimony  tellurides  Nanostructure Résumé : Nonstoichiometric ternary thermoelectric materials Ag2−ySbyTe1+y (y = 1.26, 1.29, 1.32, 1.35, and 1.38) were prepared by a direct melt-quench and hot press process. In situ composites of AgSbTe2 and Sb2Te3 were obtained over the entire composition range with a typical Widmanstätten pattern. Thermoelectric properties were measured from 300 K to 673 K, which changed systematically with Sb2Te3 ratio. The phase transition occurring at about 633 K, forming the single phased AgSbTe2, can significantly influence the electrical transport properties. Various crystallographic defects in different scales, such as atomic ordering, nanodomains, dislocations and stacking faults, have been observed by high-resolution transmission electron microscopy and their influences on lattice thermal conductivity have been discussed. Due to the extremely low thermal conductivity (about 0.6 W m−1 K−1) and large positive Seebeck coefficient of ∼250 μV K−1 detected in Ag0.71Sb1.29Te2.29, the maximum dimensionless figure of merit ZT of 1.37 was obtained at 600 K. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002132 [article] Phase compositions, nanoscale microstructures and thermoelectric properties in Ag2−ySbyTe1+y alloys with precipitated Sb2Te3 plates [texte imprimé] / S.N. Zhang, Auteur ; T.J. Zhu, Auteur ; S.H. Yang, Auteur . - 2011 . - pp. 4160–4169. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4160–4169 Mots-clés : Thermoelectric  materials  Thermoelectric  properties  Silver  antimony  tellurides  Nanostructure Résumé : Nonstoichiometric ternary thermoelectric materials Ag2−ySbyTe1+y (y = 1.26, 1.29, 1.32, 1.35, and 1.38) were prepared by a direct melt-quench and hot press process. In situ composites of AgSbTe2 and Sb2Te3 were obtained over the entire composition range with a typical Widmanstätten pattern. Thermoelectric properties were measured from 300 K to 673 K, which changed systematically with Sb2Te3 ratio. The phase transition occurring at about 633 K, forming the single phased AgSbTe2, can significantly influence the electrical transport properties. Various crystallographic defects in different scales, such as atomic ordering, nanodomains, dislocations and stacking faults, have been observed by high-resolution transmission electron microscopy and their influences on lattice thermal conductivity have been discussed. Due to the extremely low thermal conductivity (about 0.6 W m−1 K−1) and large positive Seebeck coefficient of ∼250 μV K−1 detected in Ag0.71Sb1.29Te2.29, the maximum dimensionless figure of merit ZT of 1.37 was obtained at 600 K. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002132