Cu 含量对 BaTiO3/Cu复相陶瓷材料介电性能的影响

doi:10.3724/SP.J.1077.2011.00175

无机材料学报 ›› 2011, Vol. 26 ›› Issue (2): 175-179.DOI: 10.3724/SP.J.1077.2011.00175 CSTR: 32189.14.SP.J.1077.2011.00175

Cu 含量对 BaTiO₃/Cu复相陶瓷材料介电性能的影响

蒲永平¹, 许宁¹,², 王博¹, 吴海东¹, 陈凯¹

陕西科技大学1.材料科学与工程学院;2. 教育部轻化工助剂化学与技术重点实验室, 西安710021

收稿日期:2010-04-06 修回日期:2010-05-22 出版日期:2011-02-20 网络出版日期:2011-01-21
作者简介:蒲永平(1971-), 男, 教授. E-mail: puyongping@yahoo.com.cn
基金资助:
国家自然科学基金(51072106);教育部科学技术研究重点项目(209126);陕西省科技攻关项目;陕西省教育厅科研专项基金(112H011);陕西科技大学研究生创新基金

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

PU Yong-Ping¹, XU Ning¹,², WANG Bo¹, WU Hai-Dong¹,CHEN Kai¹

1. School ofMaterials Science and Engineering, Shaanxi University of Science &Technology, Xi’an 710021, China; 2. Key Laboratory of Auxiliary Chemistry &Technology for Chemical Industry, Ministry of Education, Xi’an 710021, China

Received:2010-04-06 Revised:2010-05-22 Published:2011-02-20 Online:2011-01-21
Supported by:
National Natural Science Foundation of China (51072106); Key Research Project of Chinese Ministry of Education (209126); Province Science and Technology in the Shaanxi Offends Pass Item; Scientific Research Special Foundation of Shaanxi Educational Committee (112H011) ; Graduate Innovation Fund of Shaanxi University of Science and Technology

摘要/Abstract

摘要： 用传统固相法制备了(1- x)BaTiO₃/ xCu( x=5 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%,30 wt%)复相陶瓷, 研究了Cu含量对复相陶瓷材料的显微结构、渗流阈值及介电性能的影响. 研究结果表明BaTiO₃/Cu复相陶瓷材料的电阻率随着铜含量的增加而下降, 且在渗流阈值( x=25wt%)附近呈现非线性的下降趋势, 复合材料从绝缘体逐渐变为导体. 室温下1 kHz当Cu含量达到 x =30wt%时复相陶瓷的介电常数为~9000, 这是由于在导体和绝缘体的相界面处积累大量的空间电荷, 并由此产生界面极化, 导致介电常数的显著增大, 且随着导体含量的增加, 这种界面效应更加明显. 复相陶瓷的介电损耗随着铜含量的增加而增大, 但随着频率的升高, 由于空间电荷的减少又会使损耗呈现下降的趋势. 在25~115℃的温度范围内, 复相陶瓷温度系数小于5%,具有很高的介电常数温度稳定性.

关键词: BaTiO₃/Cu复相陶瓷, 渗流理论, 介电性能

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

中图分类号:

TB321

蒲永平, 许宁, 王博, 吴海东, 陈凯. Cu 含量对 BaTiO₃/Cu复相陶瓷材料介电性能的影响[J]. 无机材料学报, 2011, 26(2): 175-179.

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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Cu 含量对 BaTiO₃/Cu复相陶瓷材料介电性能的影响

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

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