Pb-for-Bi substitution for enhancing thermoelectric characteristics of [(Bi,Pb)[sub 2]Ba[sub 2]O[sub 4±omega]][sub 0.5]CoO[sub 2]

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Volume Title
School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2006
Major/Subject
Mcode
Degree programme
Language
en
Pages
232102/1-3
Series
Applied Physics Letters, Volume 88, Issue 23
Abstract
We report strongly enhanced thermoelectric characteristics for a misfit-layered oxide, [Bi2Ba2O4±omega]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-rayabsorption 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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Keywords
lead, cobalt, thermal conductivity, thermoelectric effects
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Citation
Sakai, K. & Karppinen, Maarit & Chen, J. M. & Liu, R. S. & Sugihara, S. & Yamauchi, H. 2006. Pb-for-Bi substitution for enhancing thermoelectric characteristics of [(Bi,Pb)[sub 2]Ba[sub 2]O[sub 4±omega]][sub 0.5]CoO[sub 2]. Applied Physics Letters. Volume 88, Issue 23. 232102/1-3. ISSN 0003-6951 (printed). DOI: 10.1063/1.2206134.