陕西科技大学学报（自然科学版）Issue(6)：62-66,5.
Ba（Fe0．5Nb0．5）O3／Ni 复合陶瓷材料介电性能的研究
The research of dielectric properties of Ba(Fe0 .5 Nb0 .5)O3/Ni composite ceramics
摘要
Abstract
The BFN/Ni composite ceramics doped with Ni in the content range of 10~30 w t%were prepared by the traditional solid state reaction in nitrogen gas .The crystal structure , microstructure ,percolation threshold and corresponding dielectric properties of ceramics were investigated .The findings suggest that there is no reaction took place between BFN and Ni during the sintered conditions when the Ni content was 30 w t% ,which shows Ni was not incorporated into the lattice of BFN matrix .The resistivity of BFN/Ni composite ceramics decreases with Ni content increasing and then the composite is gradually changing from insu-lator into conductor at the percolation threshold .The value of εr of BFN/Ni composites is raised with the increase of Ni content ,and the maximal value is about 1 670 000 at 1 kHz at room temperatures as Ni content of 30 w t% .The interfaces of the conductor and the insula-tor accumulated a large number of space charge caused to interfacial polarization .The interfa-cial effects are more significant with increasing conductor content .The dielectric behaviors of BFN/Ni composite ceramics can be explained as Maxwell-Wagner effect ,which were usually adopted to explain the extremely high dielectric constant .关键词
BFN/Ni复合陶瓷/渗流理论/介电性能Key words
BFN/Ni composite ceramics/percolation theory/dielectric properties引用本文复制引用
王卓,张亮亮,李世鹏,马妍,吕欣..Ba（Fe0．5Nb0．5）O3／Ni 复合陶瓷材料介电性能的研究[J].陕西科技大学学报（自然科学版）,2013,(6):62-66,5.基金项目
国家自然科学基金项目（51102159）；陕西科技大学博士科研启动基金项目（BJ10-16）；陕西科技大学学术骨干培养计划项目（XS11-02）；陕西科技大学研究生创新基金项目 （）
