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

来源：

JOURNAL OF ELECTRONIC MATERIALS | 2015年 / 44卷 / 04期

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

页码：1081 / 1087

页数：7

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