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Study of Ac Conductivity in Dilute CeO2:Y3+ Ceramics

Published online by Cambridge University Press:  16 February 2011

A.V. Vaysleyb ,
B.S. Lim  and
A.S. Nowick
A.V. Vaysleyb
Affiliation:
Columbia University, School of Mines, Materials Science Division, New York, NY 10027
B.S. Lim
Affiliation:
Columbia University, School of Mines, Materials Science Division, New York, NY 10027
A.S. Nowick
Affiliation:
Columbia University, School of Mines, Materials Science Division, New York, NY 10027
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Abstract

The ac conductivity was studied for different compositions of CeO2 ceramics, undoped and doped with Y3+ ions in the composition range 1 to 12 atomic %Y over the temperature range from 50 K to 500 K. It was observed that in temperature range 300-400 K, the ac conductivity (as well as the real part of the dielectric constant, ε',) follows the universal power-law frequency dependence with exponent s ≈ 0.63. No systematic variation of s, either with temperature or with dopant concentration, was observed, although for nominally “pure” CeO2 no power-law regime was observed. The features of the ac behavior were explained on the basis of a percolation approach.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 421
Copyright
Copyright © Materials Research Society 1995

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