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Slow Trap Charge Repositioning Processes and the Polarization of CaCu

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Slow trap charge repositioning processes between the field perpendicular boundaries and field parallel boundaries are put forward to explain the nonlinear to linear change of the I (V) character of CaCu3Ti4O12 (CCTO). Large polarization variations, which obviously behave as a permittivity peak were found in the charge repositioning process. The anisotropic multipole polarization that occurs in the charge repositioning process is suggested to be the reason for the enormous polarization variation and also could be the origin of colossal dielectric constant of CCTO.
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Document Type: Research Article

Affiliations: 1: The Provincial Key Laboratory of Piezoelectric Ceramics Materials and Apparatus, Faculty of Physics &Electronic technology, Hubei University, Hubei 430062, China 2: Physics Department (4.Phys. Inst.), University of Goettingen, Goettingen 37077, Germany

Publication date: August 1, 2011

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