Low Temperature Sintering Ba3Ti5Nb6O28 Ceramics with Tunable Temperature Coefficient of Dielectric Constant
A middle permittivity dielectrics with the tunable temperature coefficient of dielectric constant (τε) in the BaO-TiO2-Nb2O5 system,Ba3Ti5Nb6O28,has been synthesized and characterized.The dielectric properties of Ba3Ti5Nb6O28 measured at 1MHz are as follows:dielectric constant (εr) ~38,dielectric loss (tanδ)<0.0002,temperature coefficient of dielectric constant (τε)~-22ppm/℃.The Ba3Ti5Nb6O28 phase satisfies the requirements ofNP0 (MLCC) dielectrics,but the sintering temperature of the Ba3Ti5Nb6O28 phase (1250~1300℃) is too high to be co-fired with Ag or Cu electrodes.To lower the sintering temperature,an appropriate amount of ZnO-B2O3 frit (5~7wt.%) was added to the Ba3Ti5Nb6O28 phase and dense ceramics were obtained at the sintering temperature lower than 1000℃.Furthermore,the CaNb2O6 phase with the positive τε of 65ppm/℃ was incorporated into the Ba3Ti5Nb6O28 phase to adjust the temperature coefficient of dielectric constant from negative to positive(-22~30ppm/℃).Near zero τε ceramics with high εr (38) and low tanδ (0.0002) were obtained at the composition ofBa3Ti5Nb6O28/CaNb2O6/ZB ffit=76∶17∶7 wt.%.
Dielectrics Electroceramics Frites
Dong Guo Zhiyuan Ling Xing Hu
College of Materials Science and Engineering,South China University of Technology,Guang zhou,Guang dong,510640,PR China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
170-172
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）