High dielectric permittivity and ultralow dielectric loss in Nb-doped SrTiO3 ceramics

被引：15

作者：

Luo, Lichen ^{[1
]}

Li, Jinglei ^{[1
]}

Wang, Mingwen ^{[1
]}

Yang, Shuai ^{[1
]}

Wu, Jie ^{[1
]}

Gao, Xiangyu ^{[1
]}

Li, Chunchun ^{[1
,2
]}

Du, Wenya ^{[1
]}

Zhang, Lin ^{[1
]}

Li, Fei ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Ctr Dielect Res, Elect Mat Res Lab, Key Lab,Minist Educ & Int, Xian 710049, Shaanxi, Peoples R China

[2] Guilin Univ Technol, Coll Mat Sci & Engn, Guangxi Key Lab Opt & Elect Mat & Devices, Guilin 541004, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2022年 / 48卷 / 19期

基金：

中国国家自然科学基金;

关键词：

High dielectric permittivity; Low dielectric loss; Nb-doped SrTiO 3; PINNED DEFECT-DIPOLES; COLOSSAL PERMITTIVITY; GIANT PERMITTIVITY; RELAXATION; LI;

D O I：

10.1016/j.ceramint.2022.06.157

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：

In this study, we prepared a series of Nb-doped SrTiO3 ceramics sintered in both air and N-2 atmospheres. The X-ray diffraction (XRD) analysis indicated that all samples had a pure cubic phase perovskite structure with no secondary phase. The dielectric test showed that the Nb-doped SrTiO3 ceramics had a high dielectric permittivity (> 3 x 10(4)) and low dielectric loss (< 0.004) over a broad temperature range from-100 to 300 ?C with a breakdown strength over 20 kV/cm. The dielectric performance is attributed to the designated Ti '(Ti)- V-O(..)- Ti-Ti ' deep-lattice-defect states localising weak-hopping electrons to generate high defect-dipole concentrations, as verified by systematic X-ray photoelectron spectroscopy (XPS) experiments. This study offers a route for designing other types of high dielectric permittivity ceramics.

引用

页码：28438 / 28443

页数：6

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