Fabrication of Ba6-3x (SM0.2Nd0.8)8+2xTi18O54(x=2/3) ceramics by solid state reaction

被引：0
|
作者：
Zheng, Yong [1 ,3 ]
Lei, Wen [2 ]
Bu, Haijian [1 ]
Zhao, Xingzhong [3 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Peoples R China
[2] China Three Gorges Univ, Coll Mat Engn, Yichang 443002, Peoples R China
[3] Wuhan Univ, Coll Phys Sci & Technol, Wuhan 430072, Peoples R China
来源：
HIGH-PERFORMANCE CERAMICS IV, PTS 1-3 | 2007年 / 336-338卷
基金：
中国博士后科学基金;
关键词：
Ba6-3x(Sm0.2Nd0.8)(8+2x)Ti18O54; dielectric properties; solid state sintering;
D O I：
10.4028/www.scientific.net/KEM.336-338.258
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Effects of calcining and sintering temperatures on the microstructure and the microwave dielectric properties of Ba6-3x(Sm0.2Nd0.8)(8+2x)Ti18O54(x=2/3) ceramics were studied. When the calcining temperature was lower (1373K), the dielectric constant epsilon and the Qf factor initially increased with increasing sintering temperature, but decreased when sintering temperature was higher than 1603K. As a whole, the temperature coefficients of the resonant frequency tau(f) tended to increase with increasing sintering temperature. The microstructure of the sintered ceramic consisted mainly of columnar and block-shape grains. The grain size increased with increasing sintering temperature. When the calcining temperature was higher (1473K), epsilon(r) and tau(f) were nearly independent of sintering temperature. The excellent microwave dielectric properties were achieved in the Ba6-3x(Sm0.2Nd0.8)(8+2x)Ti18O54 (x=2/3) ceramic calcined at 1373K and sintered at 1603K for 3 h: epsilon = 80.8, Qf = 8114 (GHz) and tau(f) = 5.6.
引用
收藏
页码：258 / +
页数：2
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