Materials Transactions Online

Materials Transactions, Vol.48 No.08 (2007) pp.2104-2107
© 2007 The Thermoelectrics Society of Japan

Thermoelectric Properties of the Layered Cobaltite Ca3Co4O9 Epitaxial Films Fabricated by Topotactic Ion-Exchange Method

Kenji Sugiura1, Hiromichi Ohta1,2, Kenji Nomura3, Tomohiro Saito4, Yuichi Ikuhara5, Masahiro Hirano3, Hideo Hosono3,6 and Kunihito Koumoto1,2

1Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
2CREST, JST, Kawaguchi 332-0012, Japan
3ERATO-SORST, JST, in Frontier Collaborative Research Center, Mail-box S2-13, Tokyo Institute of Technology, Yokohama 226-8503, Japan
4Materials R & D Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
5Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan
6Frontier Collaborative Research Center, Mail-box S2-13, Tokyo Institute of Technology, Yokohama 226-8503, Japan

To clarify the thermoelectric properties of the layered cobalt oxide Ca3Co4O9 epitaxial film fabricated by the topotactic ion-exchange method [K. Sugiura et al., Appl. Phys. Lett. 89, 032111 (2006)], the electrical resistivity (ρ), Hall coefficient (RH), and Seebeck coefficient (S) of high quality Ca3Co4O9 epitaxial film were examined over the temperature range 10–1000 K. The film exhibited a low ρ of 4.0× 10-3 Ω cm and a large S of ∼+200 μV K-1, which leads to the thermoelectric power factor of 1.0× 10-3 W m-1 K-2, at 1000 K. Furthermore, the film exhibited good thermal stability at 1000 K in air.

(Received 2006/12/10; Accepted 2007/5/22; Published 2007/7/11)

Keywords: thermoelectric properties, layered cobaltite, epitaxial film, topotactic ion-exchange method, reactive solid-phase epitaxy

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