(1-x)(Mg_(0.95)Mn_(0.05))_2TiO_4-xCaTiO_3陶瓷的微波介电性能研究

Research on Microwave Dielectric Properties of (1-x)(Mg_(0.95)Mn_(0.05))_2TiO_4-xCaTiO_3 Ceramics

采用传统固相法制备了(1-x)(Mg_(0.95)Mn_(0.05))_2TiO_4-xCaTiO_3微波介质陶瓷,研究CaTiO_3添加量对陶瓷体系物相组成、显微结构以及微波介电性能的影响。XRD分析结果表明,陶瓷样品以(Mg_(0.95)Mn_(0.05))_2TiO_4为主晶相,以CaTiO_3和MgTiO_3作为次晶相存在陶瓷样品中。另外发现添加CaTiO_3能增加陶瓷的致密度,并在1325~1400℃下都能促进陶瓷的烧结。当CaTiO_3的添加量为x=0.12时,复合陶瓷在1375℃烧结4 h时具有最佳的微波介电性能:介电常数ε_r=20.26,品质因数Q×f=35125.9 GHz,τ_f=+2.7×10~(-6)/℃。

The traditional solid-phase method was used to prepare (1-x)(Mg_(0.95)Mn_(0.05))_2TiO_4-xCaTiO_3 microwave dielectric ceramics,and the effects of CaTiO_(3) additives on the phase composition,microstructure and microwave dielectric properties of the ceramic system were studied.The XRD analysis results show that the ceramic sample has(Mg_(0.95)Mn_(0.05))_(2)TiO_(4) as the main crystalline phase,in association with CaTiO_(3) and MgTiO_(3) as minor phase in the ceramic sample.In addition,it was found that adding CaTiO_(3) can increase the density of ceramics,and can promote the sintering of ceramics at 1325~1400℃.When the compounding amount of CaTiO_(3) is x=0.12,the composite ceramic sintered at 1375℃for 4 h has the best microwave dielectric properties:dielectric constantεr=20.260,quality factor Q×f=35125.9 GHz,and the frequency temperature coefficientτf=+2.7×10-6/℃.