Colossal permittivity of (Li, Nb) co-doped TiO2 ceramics

被引：47
作者：
Li, Wenlong [1 ,2 ,3 ]
Liu, Zhifu [1 ,2 ]
Zhang, Faqiang [1 ]
Sun, Qingbo [4 ]
Liu, Yun [4 ]
Li, Yongxiang [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Inorgan Funct Mat & Devices, 1295 Dingxi Rd, Shanghai 200050, Peoples R China
[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100034, Peoples R China
[3] Shanghai Tech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
[4] Australian Natl Univ, Res Sch Chem, Canberra, ACT 0200, Australia
来源：
CERAMICS INTERNATIONAL | 2019年 / 45卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Colossal permittivity; Co-doped TiO2 ceramic; Modified Debye equation; Multiple polarization; GIANT DIELECTRIC PERMITTIVITY; RELAXATION; GRAIN; AL;
D O I：
10.1016/j.ceramint.2019.03.080
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 work, (Li, Nb) co-doped TiO2 ceramics (LNTOx, x < 0.1), were synthesized through a conventional solid state reaction method. As revealed by X-ray diffraction (XRD) spectra, all LNTO ceramics exhibited pure tetragonal rutile structure. The LNTO0.01 ceramic showed a colossal permittivity over 7000 and a low dielectric loss (tg delta < 0.06) in a wide frequency range of 10(2) Hz-10(7) Hz. The dielectric spectra under DC biases were tested at different temperatures. The experimental data could fit the modified Debye equation well. It was found that there are multiple dielectric polarization mechanisms in LNTO ceramics including space charge polarization, relaxor-type relaxation, polaron hopping and dipole polarization related with localized electrons.
引用
收藏
页码：11920 / 11926
页数：7
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