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

被引：73

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

页码：6711 / 6719

页数：9

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