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Transport properties of Partially Filled YbxCo4Ge6Te6 ? Based Skutterudites.
Authors: Navrátil Jiří | Plecháček Tomáš | Beneš Ludvík | Vlček Milan | Laufek František
Year: 2007
Type of publication: článek ve sborníku
Name of source: Proceedings of the 5th European Conference on Thermoelectrics
Publisher name: The European Thermoelectric Society
Place: Odessa
Page from-to: 210-213
Titles:
Language Name Abstract Keywords
cze Transportní vlastnosti částečně zaplněných skutteruditů YbxCo4Ge6Te6 Byli připraveny vzorky částečně zaplněných ternárních skutteruditů YbxCo4Ge6Te6. Na připravených vzorcích byly změřeny jejich termoelektrické a transportní vlastnosti v rozmezí teplot 200-800 K. Termoelektrické vlastnosti vybraných vzorků YbxCo4Ge6Te6 byly dále optimalizovány substitucí kobaltu niklem a pro složení Yb0.2Co3.92Ni0.08Ge6Te6 bylo dosaženo hodnoty tzv. ?power faktoru? až 1400 ?W.m-1.K-1, což je nejvyšší hodnota pozorovaná u ternárních skutteruditů. termoelektřina
eng Transport properties of Partially Filled YbxCo4Ge6Te6 ? Based Skutterudites. The mixed anion skutterudites Co4Ge6Te6 has been synthesized and characterized with XRD. An influence of partial filling of empty voids of its structure with Yb atoms on some transport properties (electrical conductivity and Seebeck coefficient) has been studied. These properties have been measured in 200-800 K temperature range on hot-pressed samples of these compounds. Coming out of EDX results N-type conductivity of unfilled sample can be attributed partly to the tellurium vacancies in anion lattice and partly to the surplus of Ge atoms, which probably enters empty voids of the basic structure and acts here as donors. This partial occupation of the voids of the compound structure is probably responsible for the fact, that only part of Yb atoms enters these voids in YbxCo4Ge6Te6 (x<0.3). The values of the power factor S2.&#61555; stay practically the same with incorporation of the Yb atoms and increase almost three times with replacing part of Co atoms with Ni atoms at Yb0.2Co3.98Ni0.02Ge6Te6 composition. thermoelectric