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Large Dielectric Constant and M axwell– W agner Effects in BaTiO 3 /Cu Composites
Author(s) -
Ning Xu,
Yong Ping Pu,
Zhuo Wang
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04895.x
Subject(s) - permittivity , dielectric , materials science , composite material , ceramic , ferroelectricity , polarization (electrochemistry) , relative permittivity , metal , chemistry , metallurgy , optoelectronics
Dense ceramic composites with ferroelectric BaTiO 3 and metal Cu were prepared via the solid‐state reaction route at 1280°C in nitrogen atmosphere. The frequency and temperature dependence of impedance, resistance, and dielectric permittivity of BaTiO 3 / x Cu in the range of 10 −1 –10 6 Hz have been investigated, respectively. It was found that the electrical conduction and dielectric behavior of the materials vary with the ratio of the two phases. The maximum permittivity of 1.0 × 10 5 at 1 kHz was obtained for the composites of BaTiO 3 /20 wt% Cu . Moreover, the BaTiO 3 /Cu composites exhibited high values of permittivity at low frequencies than at high frequencies due to M axwell– W agner polarization. The application of the M axwell– W agner polarization model in this system was briefly discussed.