Effect of Cu Content on Dielectric Properties of BaTiO3/Cu CompositeCeramics

doi:10.3724/SP.J.1077.2011.00175

Abstract

Abstract: The BaTiO₃/Cu composite ceramics doped with Cuin the content range of 0-30 wt% were prepared by the solid-state reaction. Themicrostructure, percolation threshold and dielectric properties of ceramicswere investigated. The results show that the resistivity of BaTiO₃/Cucomposite ceramic increases with Cu content decreasing and the relationshipbetween them has a non-linear downward trend at the percolation threshold ( x=25wt%), then the composite isgradually changing from insulator into conductor. The value of ε_r of BaTiO₃/Cucomposites is raised with the increase of Cu content, and the maximal value is about9000 at 1 kHz at room temperature as Cu content of 30wt%. The dielectric lossof BaTiO₃/Cu composites increases with the increasing Cu doping, butthen decreased with the increasing frequency, which is due to the reducing ofthe amount of space charge. The temperature coefficient is less than 5% in the temperaturerange from 25℃to 115 ℃, and the dielectric constant is provided with hightemperature stability.

Key words: BaTiO₃/Cucomposites, percolation theory, dielectric properties

CLC Number:

TB321

PUYong-Ping, XU Ning, WANG Bo, WU Hai-Dong,CHEN Kai. Effect of Cu Content on Dielectric Properties of BaTiO₃/Cu CompositeCeramics[J]. Journal of Inorganic Materials, 2011, 26(2): 175-179.

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Effect of Cu Content on Dielectric Properties of BaTiO₃/Cu CompositeCeramics

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