Influence of Re-ions with different ionic radius in Ba_(12)ReNb_(9)O_(36) on crystal structure and microwave dielectric properties  

作　　者：Pengcheng Zhang Hao Li Xiaoqing Chen Xing Zhang Hongcheng Yang Canbing Li Shuren Zhang 

机构地区：[1]College of Electrical and Information Engineering,Hunan University,Changsha,410082,China [2]State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu,610054,China [3]National Engineering Research Center of Electromagnetic Radiation Control Materials,University of Electronic Science and Technology of China,Chengdu,610054,China

出　　处：《Journal of Materiomics》2022年第1期104-112,共9页无机材料学学报（英文）

摘　　要：The Ba_(12)ReNb_(9)O_(36)(Re=Yb,Ce,Tm,Er,Y,Ho,Dy,Gd)ceramics are synthesized by solid-phase reaction method.The phase composition,crystal structure,microstructure,and microwave dielectric properties of the ceramics are investigated by X-ray diffraction,X-ray photoelectron spectroscopy,Scanning electron microscopy and Raman spectrum.The optimal microwave dielectric properties(ε_(r)=37.23,Q×f=36600 GHz,andτ_(f)=34 ppm/℃)are obtained for Ba_(12)YbNb_(9)O_(36) ceramic sintered at 1420℃for 6 h.In this system,the variation of dielectric constant is dominated by polarizability.The Q×f is mainly affected by internal strain/fluctuation of d-spacing.The variation of τ_(f) is related to the temperature coefficient of dielectric constant and the oxygen octahedron distortion.Furthermore,the reduction of Ce^(4+) ions,the relative density,linear thermal expansion coefficient,and the second phase are also important factors affecting microwave dielectric properties.

关 键 词：Microwave dielectric ceramic Ba_(12)ReNb_(9)O_(36) POLARIZABILITY Raman spectrum 

分 类 号：TQ174.1[化学工程—陶瓷工业]