CeO2/Ca0.7Bi0.15Na0.15TiO3复合陶瓷微波介电性研究

Microwave Dielectric Properties of CeO2/Ca0. 7Bi0. 15Na0. 15TiO3 Composite Ceramics

通过传统固相烧结法制备了(1-x)(Ca0. 7Bi0. 15Na0. 15TiO3)-xCeO2(x=0. 6、0. 7、0. 8、0. 9)陶瓷,并对其晶体结构、表面形貌、元素化合价及微波介电性能进行了系统研究。结果表明:所有组分陶瓷均含有与Ca Ti O3和Ce O2结构相似的两相。在x=0. 4中Ce存在两种价态Ce3+和Ce4+。两相的存在导致了介电常数和谐振频率温度系数呈现线性变化,品质因数则表现为非线性变化。当x=0. 9时,Ca0. 7Bi0. 15Na0. 15TiO3-CeO2复合陶瓷微波介电性能较优,其εr=35. 1,Q×f=10889. 2 GHz和τf=27 ppm/℃。

The (1- x )(Ca 0.7 Bi 0.15 Na 0.15 TiO 3)- x CeO 2 ( x =0.6, 0.7, 0.8, 0.9) ceramics were prepared by traditional solid state methods. The crystal structure, surface structures, element chemical valence and microwave dielectric properties of (1- x )(Ca 0.7 Bi 0.15 Na 0.15 TiO 3)- x CeO 2 ceramics were studied. The results show that there are confirmed two crystal phases in ceramics for all contents, similar to CaTiO 3 and CeO 2. And there are two valence states (Ce^3+, Ce 4+) in Ce for x =0.4. The dielectric constant and the resonant temperature coefficient are changed in a linear fashion, however quality factor varied nonlinearly with CeO 2. There are the best microwave dielectric properties in Ca 0.7 Bi 0.15 Na 0.15 TiO 3-CeO 2 for x =0.9:ε r =35.1, Q×f =10889.2 GHz, and τ f= 27 ppm/℃.