Improvement of the thermoelectric characteristics of Fe-doped misfit-layered Ca3 Co4-x Fex O9+δ (x=0, 0.05, 0.1, and 0.2)

Chia Jyi Liu, Li Chen Huang, Jung Sheng Wang

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Abstract

The authors report measurements of the electrical resistivity, Seebeck coefficient, and thermal conductivity for a series of misfit-layered oxides Ca3 Co4-x Fex O9+δ (x=0, 0.05, 0.1, 0.15, 0.2) prepared by solid state reaction. Structural parameters are refined with superspace group of X2m (0b0) s0 using powder x-ray diffraction data. With partial substitution of Fe+2 for Co+3, the resistivity decreases, while the thermopower increases simultaneously. The x=0.05 sample exhibits a higher figure of merit (Z=3.01× 10-4 K-1) than that of Ca3 Co4 O9+δ (0.33× 10-4 K-1) at 300 K, indicating much improvement of thermoelectric characteristics via partial substitution of Fe for Co.

Original languageEnglish
Article number204102
JournalApplied Physics Letters
Volume89
Issue number20
DOIs
Publication statusPublished - 2006 Nov 23

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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