Influences of Al2O3/Nb2O5 co-doping on structural evolution and dielectric properties of Zn0.5Ti0.5-x(Al0.75Nb0.35)xNbO4 (0 ≤ x ≤ 0.3) ceramics

3rd International Conference on New Material and Chemical Industry

材料科学;化学工业

Yang, H.Y.^1^2 ; Zhang, S.R.^1^2 ; Yang, H.C.^1^2 ; Yuan, Y.^1^2^3 ; Li, E.Z.^1^2

National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu, China^1

Key Laboratory of Multi-Spectral Absorbing Materials and Structures, Ministry of Education, University of Electronic Science and Technology of China, Chengdu, China^2

Institute of Electronic and Information Engineering of UESTC in Guangdong, Dongguan

523808, China^3

关键词: Co-doping;    Dielectric ceramic;    Dielectric polarizabilities;    Microwave dielectrics;    Quality factors;    Structural evolution;    Temperature coefficient of resonant frequency;    ZnNb2O6;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/479/1/012051/pdf
DOI  :  10.1088/1757-899X/479/1/012051

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In present study, the influences of Al2O3 and Nb2O5 co-doping for Ti site on structure and microwave dielectric performances of Zn0.5Ti0.5-x(Al0.75Nb0.35) x NbO4 ceramics were discussed. Pure ixiolite-structured Zn0.5Ti0.5NbO4 solid solution is prepared when x ≤ 0.15. Phase transformation takes place at 0.2 ≤ x ≤ 0.3, where columbite ZnNb2O6 phase exists. The dielectric constant (r) of ceramics presents a decline trend, which is attributed to the decrease of dielectric polarizability (0 ≤ x ≤ 0.15) and the formation of ZnNb2O6 phase (0.2 ≤ x ≤ 0.3). The quality factor (Q × f), however, decrease till x = 0.15 and increase after that. The temperature coefficient of resonant frequency (τf) value varies consistently with the densification. Typical dielectric ceramics (x = 0.3) was synthesized at 115°C: a r of 25.79, a Q × f about 56114 GHz and a τf of -78.18 ppm/°C, were obtained.