Thermogravimetric study and high-temperature thermoelectric properties of [Ca2(Co1-xAx)O3] 0.62CoO2

Y. Oide, Yuzuru Miyazaki, Y. Ono, X. Y. Huang, T. Kajitani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Systematic ion substitution has been performed on the Co site in the rock-salt (RS)-type [Ca2CoO3] subsystem of misfit-layered cobalt oxide [Ca2(Co1-xAx)O 3-δ]0.62CoO2 (A = Nb, Ru, Ta, Pb, W, La and Zr). The oxygen deficiency δ and the decomposition temperature T d of the substituted samples have been determined by means of the thermogravimetric analysis (TGA). Upon heating, the oxygen atoms are gradually released from the RS-type subsystem up to δ∼0.10, A small amount (x = 0.10) of the substitution remarkably increases Td from 1173 K (x = 0) up to 1246 K (A = Nb). The Pb-substituted samples show substantial decrease in electrical resistivity ρ froth 19.2 mΩcm to 13.8 mΩcm (x = 0.10) at 950 K. The highest thermoelectric power, S2 ρ-1 = 2.1×10-4 WK-2m-1, is realized for the Pb-substituted sample with x = 0.10 at 950 K.

Original languageEnglish
Title of host publicationProceedings ICT'06 - 25th International Conference on Thermoelectrics
Pages402-405
Number of pages4
DOIs
Publication statusPublished - 2006 Dec 1
EventICT'06 - 25th International Conference on Thermoelectrics - Vienna, Austria
Duration: 2006 Aug 62006 Aug 10

Publication series

NameInternational Conference on Thermoelectrics, ICT, Proceedings

Other

OtherICT'06 - 25th International Conference on Thermoelectrics
Country/TerritoryAustria
CityVienna
Period06/8/606/8/10

ASJC Scopus subject areas

  • Engineering(all)

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