Effect of Sintering Aid CuO-MnO2 on Dielectric Properties of 0.5Ba（Mg1/3Nb2/3）O3-0.5Ba（Ni1/3Nb2/3）O3 Ceramics

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 24; no. 1; pp. 123 - 126
• Main Author: TIAN Zhongqing ZHANG Chunyan WANG Hao HUANG Weijiu LIN Lin
• Format: Journal Article
• Language: English
• Published: 2009
• Subjects: MnO2; 微波介电性能; 氧化铜; 氧化锰; 烧结助剂; 相对密度
• ISSN: 1000-2413; 1993-0437

Microstructures and microwave dielectric properties of 0.5Ba（Mg1/3Nb2/3）O3-0.5Ba（Ni1/3Nb2/3）O3 ceramics with x wt% CuO-x wt% MnO2 additions （x=0.25-1） prepared by conventional solid-state route were investigated. It is found that low level-doping of CuO-MnO2 can significantly improve the density of the specimens and their microwave dielectric properties. The relative density of 0.5Ba（Mg1/3Nb2/3）O3-0.5Ba（Ni1/3Nb2/3）O3 ceramics can be increased by 95% sintering at 1 330 ℃ due to the liquid phase effect. The second phase is not observed in ceramics with CuO-MnO2 addition. The parameterεr increases with increasing sintering temperature, and Qf is effectively promoted by CuO-MnO2 addition. Higher CuO-MnO2 content would make τf value more positive. Meanwhile, εr value of 30.5, Qf value of 63 200 GHz and τf value of 0.5 ppm/ ℃ were obtained for 0.5Ba（Mg1/3Nb2/3）O3-0.5Ba（Ni1/3Nb2/3）O3 ceramics with 0.5 wt% CuO-0.5 wt% MnO2 addition sin-tered at 1 330 ℃ for 4 h.