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AC Conductivity of Crystalline Materials and Glasses Ascribed to ADWPs

Published online by Cambridge University Press:  10 February 2011

A. S. Nowick ,
A. V. Vaysleyb ,
H. Jain  and
X. Lu
A. S. Nowick
Affiliation:
Materials Science Division, School of Mines, Columbia University, New York, NY 10027
A. V. Vaysleyb
Affiliation:
Materials Science Division, School of Mines, Columbia University, New York, NY 10027
H. Jain
Affiliation:
Materials Science Department, Lehigh University, Bethlehem, PA 18015
X. Lu
Affiliation:
Materials Science Department, Lehigh University, Bethlehem, PA 18015
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Abstract

The behavior of the frequency dependence of the conductivity, σ(ω), of numerous crystalline materials and glasses is close to an ω1.0 dependence in the limit of low temperatures and/or high frequencies (referred to as the “nearly constant loss”, or NCL, regime). Detailed analysis of this behavior, including the frequency dependence of both ε′ and ε″, shows that it can be described phenomenologically as produced by a broad distribution of asymmetric double-well potentials (ADWPs) with low activation energies. In order to obtain an understanding of the atomic origins of such potentials, we investigate the composition dependence of this behavior in such materials as crystalline CeO2:1%Y3+ ceramics with variable [Y3+] and alkali germanate glasses with variable alkali concentration. The appearance of a discrete loss peak in CeO2: 1%Y3+ helps us understand the ADWPs as due to “off-symmetry” configurations that undergo wiggling motion between adjacent minimum-energy positions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 411: Symposium T – Electricaly-Based Microstructural Characterization , 1995 , 99
Copyright
Copyright © Materials Research Society 1996

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