Abstract

The ac conductivity of CaCu₃Ti₄O₁₂ ceramics associated with electrical charge carrier motion (ions or vacancies) was investigated as a function of frequency at different temperatures. The long range migration of charge carriers within the ceramic is restricted by two kinds of insulating barriers, namely, grain boundaries and domain boundaries. The potential barriers associated with these boundaries lead to two anomalies in conductivity response and three frequency-dependent contributions to conductivity: long range diffusion of carriers, carrier migration localized within grains, and carrier migration localized within domains.

Department(s)

Materials Science and Engineering

Sponsor(s)

United States. Office of Naval Research

Keywords and Phrases

Calcium compounds; Domains; Electrical conductivity; Vacancies (crystal)

Library of Congress Subject Headings

Ceramics
Copper compounds
Dielectric relaxation
Grain boundaries

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2006 American Institute of Physics (AIP), All rights reserved.

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