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Large thermopower in metallic misfit cobalt oxides : improvement by cationic substitutions

Published online by Cambridge University Press:  21 March 2011

S. Hébert ,
L. B. Wang ,
A. Maignan ,
D. Pelloquin ,
M. Hervieu  and
B. Raveau
S. Hébert
Affiliation:
Laboratoire CRISMAT, UMR CNRS ISMRA 6508, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France
L. B. Wang
Affiliation:
Laboratoire CRISMAT, UMR CNRS ISMRA 6508, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France
A. Maignan
Affiliation:
Laboratoire CRISMAT, UMR CNRS ISMRA 6508, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France
D. Pelloquin
Affiliation:
Laboratoire CRISMAT, UMR CNRS ISMRA 6508, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France
M. Hervieu
Affiliation:
Laboratoire CRISMAT, UMR CNRS ISMRA 6508, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France
B. Raveau
Affiliation:
Laboratoire CRISMAT, UMR CNRS ISMRA 6508, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France
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Abstract

The thermoelectric properties of misfit cobaltites have been investigated. Their crystallographic structure consists in the stacking of layers of tilted CoO6 edge-shared octahedra, separated by rock-salt type layers. The Tl based family was first investigated : it is shown that by increasing the Tl content, the resistivity ρ can be reduced while keeping a large thermopower S. Another way to improve the figure of merit Z=S2/(ρκ) is to partially substitute Bi for Tl to increase S and keep a small ρ. A new family of Pb-based misfits has also been investigated. Two different techniques have been attempted to decrease ρ and/or increase S in this family : the partial substitution of Cu for Co, and the partial substitution of Ca for Sr.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 691: Symposium G – Thermoelectric Materials 2001--Research and Applications , 2001 , G12.5
Copyright
Copyright © Materials Research Society 2002

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References

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