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Electrical and thermal transport properties of the Y1 − x Mx CrO3 system

Published online by Cambridge University Press:  31 January 2011

W.J. Weber ,
C.W. Griffin  and
J.L. Bates
W.J. Weber
Affiliation:
Battelle, Pacific Northwest Laboratories, P. O. Box 999, Richland, Washington 99352
C.W. Griffin
Affiliation:
Battelle, Pacific Northwest Laboratories, P. O. Box 999, Richland, Washington 99352
J.L. Bates
Affiliation:
Battelle, Pacific Northwest Laboratories, P. O. Box 999, Richland, Washington 99352
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Abstract

The effects of substituting divalent metal ions (Mg, Ca, Sr, Ba) for Y in YCrO3 were investigated by electrical conductivity, Seebeck coefficient, and thermal conductivity measurements. The electrical conductivity results were consistent with the hopping-type conduction of a temperature-independent concentration of small polarons, with measured activation energies of 0.18-0.26 eV. The Seebeck coefficient increased nearly linearly with temperature and indicated p-type conductivity. Both electrical conductivity and Seebeck coefficient results show a strong dependence on dopant size (ionic radius) and indicate that the highest carrier concentrations were associated with Ca as the dopant, which is attributed to the similar ionic radii of Ca2+ and Y3+. The thermal conductivity decreased slightly with temperature and dopant concentration.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 5 , October 1986 , pp. 675 - 684
Copyright
Copyright © Materials Research Society 1986

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