ac conductivity relaxation processes in CaCu3Ti4O12 ceramics: Grain boundary and domain boundary effects

Applied Physics Letters - Tập 89 Số 24 - 2006
Wei Li1, Robert W. Schwartz1
1University of Missouri-Rolla Department of Material Science and Engineering, , Rolla, Missouri 65409

Tóm tắt

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.

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Tài liệu tham khảo

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Applied Physics Letters

Tập 89 Số 24

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