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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© 2006 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the authors and the American Institute of Physics. The following article appeared in Applied Physics Letters. Volume 88, Issue 23 and may be found at http://scitation.aip.org/content/aip/journal/apl/88/23/10.1063/1.2206134.
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School of Chemical Technology |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2006
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Language
en
Pages
232102/1-3
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Applied Physics Letters, Volume 88, Issue 23
Abstract
We report strongly enhanced thermoelectric characteristics for a misfit-layered oxide, [Bi2Ba2O4±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.Description
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.