Colossal permittivity of (Gd plus Nb) co-doped TiO2 ceramics induced by interface effects and defect cluster

被引：68
|
作者：
Cao, Zhenzhu [1 ]
Zhao, Jiajia [1 ]
Fan, Jiangtao [1 ]
Li, Guorong [2 ]
Zhang, Hong [1 ]
机构：
[1] Inner Mongolia Univ Technol, Chem Engn Coll, Hohhot 010051, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Funct Mat & Device, Shanghai 200050, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2021年 / 47卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Rutile; TiO2; ceramics; Codoping; Dielectric constant;
D O I：
10.1016/j.ceramint.2020.11.012
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：
Material with high dielectric constant plays an important role in energy storage elements. (Gd + Nb) co-doped TiO2 (GNTO) ceramics with giant dielectric permittivity (>10(4)), low dielectric loss, good temperature and frequency stability in broad range of 30-150 degrees C and 10(2)-10(6) Hz have been systematically characterized. Especially, a low dielectric loss of 0.027 and a giant dielectric permittivity of 5.63 x 10(4) at 1 kHz are attained for the composition with x = 0.01. Results of complex impedance spectroscopy, I-V curve and frequency dependent dielectric constant under DC bias indicate that internal barrier layer capacitance (IBLC) effect, electrode effect and electron-pinned defect-dipole (EPDD) effect contribute to the colossal permittivity (CP) property simultaneously.
引用
收藏
页码：6711 / 6719
页数：9
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