Effect of MgO excess on structure and microwave dielectric properties of Mg4Nb2O9 ceramics

被引：2
|
作者：
Guo, J. D. [1 ]
Li, C. Y. [1 ]
Mei, Q. J. [1 ]
Wang, G. [1 ]
Wu, H. T. [1 ,2 ]
Zou, Q. [2 ]
机构：
[1] Univ Jinan, Shandong Prov Key Lab Preparat & Measurement Bldg, Jinan 250022, Peoples R China
[2] Tianjin Univ, Sch Elect & Informat Engn, Tianjin 300072, Peoples R China
来源：
MATERIALS TECHNOLOGY | 2015年 / 30卷 / 03期
关键词：
Magnesium niobate; Excess of MgO; Sol-gel process; Microwave dielectric properties; SOL-GEL TECHNIQUE; MG5NB4O15;
D O I：
10.1179/1753555714Y.0000000155
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Corundum structured Mg4Nb2O9 dielectric ceramics with the excess of MgO were prepared by the sol- gel process and microwave dielectric properties were investigated with the excess of MgO. First, according to the stoichiometric ratio of Mg4Nb2O9 phase formation was studied by means of XRD analysis by adjusting the ratio of Mg/Nb and the ratio was ranging from 0.5 to 2.4. Subsequently, based on phase formation microwave dielectric properties of Mg4Nb2O9 ceramics as a function of ratio of Mg/Nb were obtained depending on phase change. The results showed that when the ratio of Mg/Nb was 2.1, pure phase of Mg4Nb2O9 ceramics could be obtained at 1275 degrees C with excellent microwave dielectric properties of epsilon(r) = 12.5, Q(f) = 224,000 GHz, tau(f) = -42.8 ppm/degrees C.
引用
收藏
页码：134 / 137
页数：4
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