Colossal permittivity with ultralow dielectric loss in In plus Ta co-doped rutile TiO2

被引:141
作者
Dong, Wen [1 ]
Hu, Wanbiao [1 ]
Frankcombe, Terry J. [1 ,2 ]
Chen, Dehong [1 ]
Zhou, Chao [3 ]
Fu, Zhenxiao [3 ]
Candido, Ladir [4 ]
Hai, Guoqiang [5 ]
Chen, Hua [6 ]
Li, Yongxiang [7 ]
Withers, Ray L. [1 ]
Liu, Yun [1 ]
机构
[1] Australian Natl Univ, Res Sch Chem, Canberra, ACT 2601, Australia
[2] Univ New South Wales, Sch Phys Environm & Math Sci, Canberra, ACT 2601, Australia
[3] Fenghua Adv Technol Holding Co Ltd, Zhaoqing, Guangdong, Peoples R China
[4] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go, Brazil
[5] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
[6] Australian Natl Univ, Ctr Adv Microscopy, Canberra, ACT 2601, Australia
[7] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Funct Mat & Devices, Shanghai 200050, Peoples R China
基金
澳大利亚研究理事会;
关键词
CACU3TI4O12; CERAMICS;
D O I
10.1039/c6ta08337d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Colossal permittivity (CP) materials have many important applications in electronics but their development has generally been hindered due to the difficulty in achieving a relatively low dielectric loss. In this work, we report an In + Ta co-doped TiO2 material system that manifests high dielectric permittivity and low dielectric loss based on the electron-pinned defect-dipole design. The dielectric loss can be reduced down to e.g. 0.002 at 1 kHz, giving high performance, low temperature dependent dielectric properties i.e. 3(r) > 10(4) with tan delta < 0.02 in a broad temperature range of 50-400 K. Density functional theory calculations coupled with the defect analysis uncover that electron-pinned defect dipoles (EPDDs), in the form of highly stable triangle-diamond and/or triangle-linear dopant defect clusters with well-defined relative positions for Ti reduction, are also present in the host material for the CP observed. Such a high-performance dielectric material would thus help for practical applications and points to further discovery of promising new materials of this type.
引用
收藏
页码:5436 / 5441
页数:6
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