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Dramatically Enhanced Thermoelectric Properties of Ca3Co4Oy by Large Amount of RE Substitution

Published online by Cambridge University Press:  01 February 2011

Y. Sugiura ,
S. Horii ,
T. Kumagai ,
T. Okamoto ,
K. Otzschi ,
J. Shimoyama  and
K. Kishio
Y. Sugiura
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan
S. Horii
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan
T. Kumagai
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan
T. Okamoto
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan
K. Otzschi
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan
J. Shimoyama
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332–0012, Japan
K. Kishio
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan
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Abstract

We report the synthesis and thermoelectric properties of [(Ca1-xREx)2CoO3-δ]0.62CoO2 compounds (RE: rare earth element, RE = Y, Sm, Eu, Tb, Dy, Ho and Lu). From optimization of synthesis conditions, all the chosen RE in this study were able to be substituted for the Ca sites in the block layers up to x = 0.25. In the case of RE = Tb, at 1150 K, only κ was systematically decreased with x, while both Seebeck coefficient (S) and resistivity (ρ) were almost constant for the charge of x. Consequently, the dimensionless figure of merit (ZT) was increased with x and reached 0.2 at 1150 K for x = 0.25. Moreover, interestingly, it was found that S and ρ at 300 K were enhanced with ionic radius of the doped trivalent RE ions in spite of the doping of equivalent RE ions. This is probably because local structures of oxygen sites around Co ion in the CoO2 layers largely depend on kinds of the doped RE.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF6.10
Copyright
Copyright © Materials Research Society 2005

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References

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