Effects of Mg2+ substitution on microstructure and microwave dielectric properties of (Zn1−xMgx)Nb2O6 ceramics
Effects of Mg2+ substitution on microstructure and microwave dielectric properties of (Zn1−xMgx)Nb2O6 ceramics
复制标题
DOI：
10.1016/s0272-8842(03)00068-3
复制
发表时间：
2004
影响因子：
5.2
通讯作者：
Yingchun Zhang;J. Wang;Zhenxing Yue;Z. Gui;Long-tu Li
中科院分区：
文献类型：
--
作者：
Yingchun Zhang;J. Wang;Zhenxing Yue;Z. Gui;Long-tu Li
The sintering behavior, microstructure and microwave dielectric properties of (Zn1−xMgx)Nb2O6(0<x<1.0) solid solution were investigated systematically by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and a network analyzer. The sintering temperature of (Zn1−xMgx)Nb2O6ceramics increased from 1150 to 1350 °C with increasing Mg content from x=0 to x=1.0. The crystal structure exhibited a columbite structure for all x values. The changes of grain shape from equiaixed to rectangle were observed in sintered samples as x varied from 0 to 0.5. The dielectric properties of (Zn1−xMgx)Nb2O6solid solution exhibited a significantly dependence on the sintering condition, microstructure and compositions of ceramics. The dielectric constants (εr) of sintered samples decreased from 23.66 to 19.17 with increasing Mg content from x=0 to x=1.0. All quality factors (Q×f) of (Zn1−xMgx)Nb2O6ceramics were lower than those of ZnNb2O6and MgNb2O6and ranged from 82 220 to 31 218 GHz for sintered samples. However, the τfvalues were lower than those of ZnNb2O6and MgNb2O6, the minimum τfvalue can be obtained at x=0.5 and were −29.46 ppm/°C.
