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To clarify the thermoelectric properties of the layered cobalt oxide Ca 3 Co 4 O 9 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 (R H ), and Seebeck coefficient (S) of high quality Ca 3 Co 4 O 9 epitaxial film were examined over the temperature range 10-1000 K. The film exhibited a low p of 4.0 x 10 -3 Ω cm and a large S of ∼+200μVK -1 , which leads to the thermoelectric power factor of 1.0 x 10 -3 Wm -1 K -2 , at 1000 K. Furthermore, the film exhibited good thermal stability at 1000 K in air.

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Thermoelectric Properties of the Layered Cobaltite Ca&lt;SUB&gt;3&lt;/SUB&gt;Co&lt;SUB&gt;4&lt;/SUB&gt;O&lt;SUB&gt;9&lt;/SUB&gt; Epitaxial Films Fabricated by Topotactic Ion-Exchange Method