Effects of CuO Addition on the Microstructure and Microwave Dielectric Properties of MgTa2O6 Ceramics
MgTa2O6 powders with the tetragonal phase were synthesized by mixed oxide method at 1100℃ with the molar ratios of MgO and Ta2O5 from 1∶1 to 1.2∶1.The microwave dielectric properties of sintered MgTa2O6 ceramics without additives at 1400℃ for 6h,which consists of tetragonal and orthorhombic phases were investigated.The ceramic possesses a dielectric constant of 27.5,a high Q×f value of 156000 GHz and a temperature coefficient of resonant frequency of 21.6 ppm/℃ at 6-10 GHz.Different amounts of CuO was used as sintering additives to lower the sintering temperature of MgTa2O6 ceramics.The effect of CuO doping on the microstructure,densification and the microwave dielectric properties of MgTa2O6 was studied.The results indicate that the 1-5 wt.% CuO dopant can lower the sintering temperatures dramatically.The second phase of CuTa2O6 was found in MgTa2O6 ceramics,which caused the deterioration of Q×f value of the ceramics.
MgTa2O6 Low temperature sintering Microwave dielectric ceramics
Baojian Fu Yingchun Zhang Xiaoli Su Yanhong Liu Ming Hong
School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,PR China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
1222-1225
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）