SYNTHESIS AND THERMOELECTRIC PROPERTIES OF MAGNETICALLY C-AXIS-ORIENTED [Ca2CoO3-d]0.62CoO2 BULK WITH VARIOUS OXYGEN CONTENTS

Authors report the preparation of highly grain-aligned and densified [Ca2CoO3-d]0.62CoO2 bulks and their high thermoelectric performance. The highly c-axis aligned (F=0.94) and densified samples with low resistivity at RT (approximately 5 mOHM cm) were obtained by the combination of magnetic alignme...

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Published in:Jpn.J.Appl.Phys ,Part 2. Vol. 42, no. 2B, pp. L198-L200. 2003 Part 2. Vol. 42, no. 2B, pp. L198-L200. 2003, 2003-02, Vol.42 (2B), p.L198-L200
Main Authors: Sano, M, Horii, S, Matsubara, I, Funahashi, R, Shikano, M, Shimoyama, J, Kishio, K
Format: Article
Language:English
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Summary:Authors report the preparation of highly grain-aligned and densified [Ca2CoO3-d]0.62CoO2 bulks and their high thermoelectric performance. The highly c-axis aligned (F=0.94) and densified samples with low resistivity at RT (approximately 5 mOHM cm) were obtained by the combination of magnetic alignment and spark-plasma-sintering methods. Resistivity r and Seebeck coefficient S along the ab plane were changed with O content and, consequently, a power factor (=S2/r) was enhanced up to 3.5 x 10-6 W.cm-1.K-2 at 300 K for the sample annealed at 500 C in air. 12 refs.
ISSN:0021-4922
DOI:10.1143/JJAP.42.L198