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Thermoelectric Properties and Power Factor of YBa2Cu3O6+xwith Rare-earth Dopants

Published online by Cambridge University Press:  31 January 2011

T. Kawahara ,
S. Tamura ,
H. Inai ,
Y. Okamoto  and
J. Morimoto
T. Kawahara
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239–8686, Japan
S. Tamura
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239–8686, Japan
H. Inai
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239–8686, Japan
Y. Okamoto
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239–8686, Japan
J. Morimoto
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239–8686, Japan
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Abstract

Both the thermoelectric power and the resistivity of the oxygen deficient YBa2Cu3O6+x samples were measured. The rare-earth-doped samples, such as Sm and Dy, whose magnetic moments in the +3 valence state are different, were studied. Then the power factor of the thermoelectric ability was calculated. The power factor of the Dy-doped samples is smaller than those of the other samples, especially at high temperature. This smallness of the power factor is the main reason why the Dy-doped samples have larger resistivity. We try to analyze the data by the theoretical expression under the variable range hopping conduction model. The expression of the thermoelectric power could be fit for the nondoped and Sm-doped samples, except at low temperature. In this situation, the thermoelectric power increases as temperature increases, and this temperature dependence is good for the thermoelectric materials at high temperature where the resistivity decreases with temperature increasing.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1200 - 1203
Copyright
Copyright © Materials Research Society 1999

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References

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