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Electrical Conductivity and Nonstoichiometry in Pr0.545Ce0.455O2-x

Published online by Cambridge University Press:  15 February 2011

O. Porat ,
H. L. Tuller ,
M. Shelef  and
E. M. Logothetis
O. Porat
Affiliation:
Crystal Physics and Electroceramics Laboratory, Department of Materials Science and Engineering, MIT, Cambridge MA 02139
H. L. Tuller
Affiliation:
Crystal Physics and Electroceramics Laboratory, Department of Materials Science and Engineering, MIT, Cambridge MA 02139
M. Shelef
Affiliation:
Ford Research Laboratory, P.O. Box 2053, Dearborn MI 48121
E. M. Logothetis
Affiliation:
Ford Research Laboratory, P.O. Box 2053, Dearborn MI 48121
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Abstract

The oxygen nonstoichiometry of Pr0.545Ce0.455O2-x was studied by solid state coulometric titration and was found to be extensive (0 ≤ y ≤ 0.28) at temperatures of 400–600 °C. The Po2 - x curves showed evidence of the existence of a number of single and two phase regions. Electrical conductivity measurements, performed under similar conditions, exhibited a p-n transition for temperature of 500 °C and below. The activated p-type conductivity was modeled in terms of the small polaron hopping mechanism. The p-n transition was correlated with the onset of phase separation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 531
Copyright
Copyright © Materials Research Society 1997

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References

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