Effects of zinc substitution on the dielectric properties of Ca_(5)Nb_(4)TiO_(17) microwave ceramics  

作　　者：Chunchun Li Xiaoyong Wei Haixue Yan Michael J.Reece 

机构地区：[1]Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric Research,Xi’an Jiaotong University,Xi’an 710049,P.R.China [2]School of Engineering and Material Science Queen Mary University of London,London E14NS,U.K.

出　　处：《Journal of Advanced Dielectrics》2013年第4期4-8,共5页先进电介质学报（英文）

基　　金：supported by the National Basic Research Program of China(2009CB623306);International Science&Technology Cooperation Program of China(2013DFR50470).

摘　　要：Ca_(5)Nb_(4)TiO_(17) ceramics with 0≤x≤0.4 were prepared through a solid-state reaction method.Effects of zinc substitution on sintering behavior and microwave dielectric properties of Ca_(5)Nb_(4)TiO_(17) ceramics were investigated.The sintering temperature was significantly lowered from 1480℃for pure Ca_(5)Nb_(4)TiO_(17) to 1260℃ for x=0.4.The microwave dielectric properties are strongly correlated with the composition.It is worth noting that the temperature cofficient of resonant frequency(τf)displays a tendency toward positive value,ranging from-126.4 ppm/℃ to-8.6 ppm/℃.A temperature stable microwave ceramic with dielectric constant of 52 and Q×f value of 9937GHz is achieved at x=0.4 and is a potential candidate for application as cores in dielectrically loaded antennas.

关 键 词：CERAMICS dielectrics perovskite like structure microwave properties 

分 类 号：TQ1[化学工程]