Aluminum substitution for titanium in Ba3.75Nd9.5Ti18O54 microwave dielectric ceramics

被引:40
作者
Chen, Hetuo [1 ]
Tang, Bin [1 ]
Gao, Anqi [2 ,3 ]
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
[2] Jinan Univ, Dept Phys, Guangzhou 510632, Guangdong, Peoples R China
[3] Jinan Univ, Siyuan Lab, Guangzhou 510632, Guangdong, Peoples R China
关键词
SOLID-SOLUTIONS; BA6-3XND8+2XTI18O54; MICROSTRUCTURE;
D O I
10.1007/s10854-014-2414-0
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
Effects of aluminum substitution for titanium on microwave dielectric properties of Ba3.75Nd9.5Ti18-zAlzO54 (z = 0-3.0) ceramics were investigated in this study. X-ray diffraction patterns of sintered samples revealed single-phase formation with an orthorhombic structure of all compositions. Scanning electron microscopy (SEM) and energy dispersive spectrometer results confirmed the substitution at b-site. A small amount of aluminum substitution into b-site lead to the decrease of relative dielectric constant (epsilon(r)) and temperature coefficient of resonant frequency (tau(f)), but significantly improved the quality factor (Qf). Further aluminum substitution content of z a parts per thousand yen 1.5 resulted in the drop of Qf value and restraint of Ti reduction. Excellent microwave dielectric properties with z = 1.5 sintered at 1,350 A degrees C for 2 h in air would be obtained: epsilon(r) = 72.7, Qf = 13,112 GHz and tau(f) = +5 ppm/A degrees C. Tolerance factor, electronegativity difference, ionic polarizability and b-site bond valence were calculated to clarify the relationship between microstructure and microwave dielectric properties.
引用
收藏
页码:405 / 410
页数:6
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