Thermoelectric Properties of Sintered and Textured Nd-Substituted Ca3Co4O9 Ceramics
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概要
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We present the results of low- and high-temperature measurements, from 5 to 800 K, of the electrical resistivity and thermoelectric power of polycrystalline and $c$-axis-oriented textured samples of Ca3-zNdzCo4O9 ($0\leq z\leq 0.9$). Crystallographic structure, microstructure and texture analyses of the samples have also been carried out. The substitution of the lighter rare-earth large ionic Nd for Ca results in an increase in the Seebeck coefficient. However, the resistivity of the samples also increases accordingly. In addition, the Hall effect of the polycrystalline Ca3-zNdzCo4O9 sample was studied in the 50–300 K interval. This measurement showed that the variation of Seebeck coefficient and resistivity are caused by a decrease in carrier concentration with Nd content. The decomposition temperatures of the samples with Nd content were observed to increase to values beyond the melting point of Ag, the technically important contact material for the fabrication of thermoelectric modules. The studies on the thermoforged samples indicate that the electrical resistivity of the textured samples decreased by 2.5-fold as compared with that of the conventional sintered samples. The increase in the decomposition temperature and the high Seebeck coefficient with low resistivity in thermoforged samples make the Nd-doped Ca3Co4O9 oxide as one of the candidate materials for high-temperature thermoelectric modules.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2007-10-15
著者
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Terasaki Ichiro
Department Of Applied Physics The University Of Tokyo
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Kobayashi Wataru
Department Of Applied Physics Waseda University
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Noudem Jacques
CRISMAT-ENSICAEN, University of Caen Basse-Normandie, CNRS/UMR 6508, 6 Bd Maréchal Juin, 14050 CAEN Cedex 4, France
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Terasaki Ichiro
Department of Applied Physics, Waseda University, 3-4-1 Ohkubo, Shinjuku, Tokyo 169-8555, Japan
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Prevel Marlene
CRISMAT-ENSICAEN, University of Caen Basse-Normandie, CNRS/UMR 6508, 6 Bd Maréchal Juin, 14050 CAEN Cedex 4, France
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Reddy Eddula
CRISMAT-ENSICAEN, University of Caen Basse-Normandie, CNRS/UMR 6508, 6 Bd Maréchal Juin, 14050 CAEN Cedex 4, France
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Perez Olivier
CRISMAT-ENSICAEN, University of Caen Basse-Normandie, CNRS/UMR 6508, 6 Bd Maréchal Juin, 14050 CAEN Cedex 4, France
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Goupil Christophe
CRISMAT-ENSICAEN, University of Caen Basse-Normandie, CNRS/UMR 6508, 6 Bd Maréchal Juin, 14050 CAEN Cedex 4, France
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Reddy Eddula
CRISMAT-ENSICAEN, University of Caen Basse-Normandie, CNRS/UMR 6508, 6 Bd Maréchal Juin, 14050 CAEN Cedex 4, France
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Perez Olivier
CRISMAT-ENSICAEN, University of Caen Basse-Normandie, CNRS/UMR 6508, 6 Bd Maréchal Juin, 14050 CAEN Cedex 4, France
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Goupil Christophe
CRISMAT-ENSICAEN, University of Caen Basse-Normandie, CNRS/UMR 6508, 6 Bd Maréchal Juin, 14050 CAEN Cedex 4, France
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Kobayashi Wataru
Department of Applied Physics, Waseda University, 3-4-1 Ohkubo, Shinjuku, Tokyo 169-8555, Japan
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