Microwave dielectric properties of (1-x)ZnNb2O6-xBa(Zn1/3Nb2/3)O3 compound ceramic with near zero temperature coefficient

作者：Xie, Wentao^*; Jiang, Qinxian; Cao, Qinglin; Zhou, Hongqing; Ren, Luchao; Luo, Xianfu

来源：Journal of Materials Science: Materials in Electronics , 2018, 29(3): 2170-2174.

DOI：10.1007/s10854-017-8129-2

• SINTERING BEHAVIOR
• MICROSTRUCTURE
• ZNNB2O6

The phase composition, microstructures, sintering behavior, and microwave dielectric properties of (1 - x)ZnNb2O6-xBa(Zn1/3Nb2/3)O-3 (x = 0.25, 0.30, 0.35, 0.40) ceramics prepared via conventional solid-state route were systematically investigated as a function of x value and sintering temperature. The ixiolite ZnNb2O6, perovskite Ba(Zn1/3Nb2/3)O-3, and a minor phase of Ba3Zn1/3Nb14/3O15 were obtained throughout the studied compositional range. The variation of bulk density and dielectric properties are related to the x value. With increasing molar fraction of Ba(Zn1/3Nb2/3)O-3, the temperature coefficient of resonant frequency (tau (f) ) value decreased, and a near-zero tau (f) value could be obtained for the samples with x = 0.30. The optimum microwave dielectric properties with an epsilon (r) value of 31.22, a Q x f value of 39,611 GHz (at 5.5 GHz), and a tau (f) value of - 2.28 ppm/A degrees C were obtained for 0.7ZnNb(2)O(6)-0.3Ba(Zn1/3Nb2/3)O-3 ceramics sintered at 1200 A degrees C for 4 h, which showed dense microstructures as well as well-developed grain growth.

• 出版日期2018-2
• 单位江苏大学; 江苏理工学院; 南京工业大学