摘要
研究了烧结温度对掺质量分数为0.5%的TiO2的Ba4.2(Sm0.8Nd0.17Bi0.03)9.2Ti18O54(简称BSNBT)陶瓷材料微观结构及其微波介电性能的影响.采用XRD,场发射扫描电子显微镜(FE-SEM)和EPMA分析了陶瓷材料的微观结构.结果表明,当烧结温度高于1 340℃时陶瓷样品中出现第二相BaTi4O9.随着烧结温度的升高,材料的介电常数rε和Qf值(品质因数和谐振频率的乘积)先增大后减小,谐振频率温度系数逐渐增大.当烧结温度为1 340℃时,rε和Qf值均达到最大,rε=80.5,Qf=9 009 GHz(在3.5 GHz下),此时谐振频率温度系数fτ=6.5×10-6/℃.
The microstructure of Ba4.2 ( Sm0.5 Nd0.17 Bi0.03 ) 9.2 Ti18O54 (BSNBT) with w (TiO2) = 0.5 % added sintered at different temperatures was analyzed by X-ray diffraction, FE-SEM and EPMA. The results show that the second phases BaTi4O9 are formed at more than 1 340℃. The relative permittivity and Qf (the product of quality factor and resonate frequency ) values exhibit a non-linear behaviour and reach maxima at the sintering temperature of 1 340 ℃, while the τf values show a linear increase with increasing sintering temperature. The specimen exhibited excellent dielectric properties with ετ=80.5, Qf=9 009 GHz (at 3.5 GHz) and τf=6.5×10^-6/℃ when sintered at 1 340℃ for 2 hours.
出处
《华中科技大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2007年第2期80-82,共3页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(60001002)