High insulation resistivity and low dielectric loss in (Ta, Al)-codoped BaTiO3 colossal permittivity materials

被引:10
|
作者
Fan, Jiangtao [1 ,2 ]
He, Gang [1 ]
Long, Zhen [1 ]
Hu, Zhanggui [1 ,2 ]
机构
[1] Tianjin Univ Technol, Tianjin Key Lab Funct Crystal Mat, Inst Funct Crystal, Coll Mat Sci & Engn, Tianjin, Peoples R China
[2] Hefei Univ Technol, Coll Mat Sci & Engn, Hefei, Peoples R China
基金
中国国家自然科学基金;
关键词
colossal permittivity; defect dipoles; insulation resistivity; sintering atmosphere; DOPED TIO2 CERAMICS; DEFECT CHEMISTRY; NB; CACU3TI4O12; BEHAVIORS; ENHANCEMENT; STABILITY; DIPOLES; ORIGIN; SB;
D O I
10.1111/jace.19775
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
Low insulation resistivity is a key factor limiting the practical application of colossal permittivity (CP) ceramics in electronic components. In this study, BaTiO3-0.01Ta(2)O(5)-xAl(2)O(3) (BTAx, x = 0.005, 0.01, 0.015, 0.02) CP ceramics with high insulation resistance were successfully prepared by sintering in N-2. In particular, BTA0.015 ceramic exhibits CP (epsilon(r) = 2.01 x 10(5), 1 kHz), low dielectric loss (tan delta = 0.044, 1 kHz), high insulation resistivity (rho(v) = 1.4 x 10(9) Omega cm, DC voltage (DC) 100 V), and superior frequency and thermal stability (20 Hz-1 MHz, room temperature-350 degrees C). The polarization mechanism, dielectric and insulating properties were investigated by different atmosphere processing, scanning electron microscopy (SEM) X-ray photoelectron spectroscopy (XPS), and impedance analysis. Moderate doping of Al2O3 facilitates the construction of electron-pinned defect dipoles, which improves the dielectric properties. In addition, the ceramics feature an extremely fine grain size, which is conducive to suppressing the long-range migration of delocalized electrons. The combination of electron pinning defect dipole effects and internal barrier layer capacitance effects are the responsible for the giant dielectric constant. This research shows that the defect dipole-dependent polarization can be employed to design highly insulating BaTiO3-based CP ceramics.
引用
收藏
页码:4854 / 4863
页数:10
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