Pb-for-Bi substitution for enhancing thermoelectric characteristics of [(Bi,Pb)2Ba2O4±w]0.5CoO2

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2006

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en

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1-3

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Applied Physics Letters, Volume 88, issue 23

Abstract

We report strongly enhanced thermoelectric characteristics for a misfit-layered oxide, [Bi2Ba2O4±ω]0.5CoO2, in a wide temperature range, as achieved through substituting up to 20% of Bi by Pb. The Pb substitution kept the thermal conductivity (κ) unchanged but decreased the electrical resistivity (ρ) and increased the Seebeck coefficient (S) simultaneously, such that a three-fold enhancement in the thermoelectric figure of merit, Z (≡S2/ρκ), was realized. At the same time x-ray absorption near-edge structure data indicated that the valence and spin states of Co are not affected by the Pb-for-Bi substitution.

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Sakai , K , Karppinen , M , Chen , J M , Liu , R , Sugihara , S & Yamauchi , H 2006 , ' Pb-for-Bi substitution for enhancing thermoelectric characteristics of [(Bi,Pb)2Ba2O4±w]0.5CoO2 ' , Applied Physics Letters , vol. 88 , no. 23 , 232102 , pp. 1-3 . https://doi.org/10.1063/1.2206134