Microstructure and Microwave Dielectric Properties of Ba3.75Nd9.5Ti18-z (Mg1/3Nb2/3) z O54 Ceramics

被引:20
作者
Chen, Hetuo [1 ]
Tang, Bin [1 ]
Duan, Shuxin [1 ]
Yang, Han [1 ]
Li, Yingxiang [1 ]
Li, Hao [1 ]
Zhang, Shuren [1 ]
机构
[1] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China
关键词
Microwave dielectric properties; bond valence; substitution; microstructure; PHASE EVOLUTION; BOND VALENCE; BA6-3XND8+2XTI18O54; SUBSTITUTION; TITANIUM;
D O I
10.1007/s11664-015-3630-y
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The effects of magnesium and niobium substitution for titanium on the microwave dielectric properties of Ba3.75Nd9.5Ti18-z (Mg1/3Nb2/3) (z) O-54 (0 a parts per thousand currency sign z a parts per thousand currency sign 3) ceramics were studied. The temperature coefficient of resonant frequency (tau (f) ) decreased from about +60 ppm/A degrees C to +17 ppm/A degrees C when z a parts per thousand currency sign 1. Excellent quality factor (Qf = 7300 GHz) as well as high dielectric constant (epsilon (r) = 80.96) were obtained. For z a parts per thousand yen 1.5, Nd-2(Ti,Mg,Nb)(2)O-7 secondary phase appeared which would obviously influence the microwave dielectric properties. As z varied from 0 to 3, matrix grain size degraded which would obviously deteriorate the microwave dielectric properties by conducting more pores, especially the Qf value. The tau (f) value was found to be related to b-site bond valence (V (B-O)) and unit cell volume (V (m)). Average ionic polarizability (alpha (D)) and relative density evidently influenced the dielectric constant.
引用
收藏
页码:1081 / 1087
页数:7
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