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Pb-for-Bi substitution for enhancing thermoelectric characteristics of [(Bi,Pb)2Ba2O4±ω]0.5CoO2.
- Source :
- Applied Physics Letters; 6/5/2006, Vol. 88 Issue 23, p232102, 3p, 5 Graphs
- Publication Year :
- 2006
-
Abstract
- We report strongly enhanced thermoelectric characteristics for a misfit-layered oxide, [Bi<subscript>2</subscript>Ba<subscript>2</subscript>O<subscript>4±ω</subscript>]<subscript>0.5</subscript>CoO<subscript>2</subscript>, 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 (≡S<superscript>2</superscript>/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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 88
- Issue :
- 23
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 21215609
- Full Text :
- https://doi.org/10.1063/1.2206134