Colossal permittivity with ultralow dielectric loss in In + Ta co-doped rutile TiO2. Issue 11 (27th February 2017)

• Record Type: Journal Article
• Authors: Dong, Wen; Hu, Wanbiao; Frankcombe, Terry J.; Chen, Dehong; Zhou, Chao; Fu, Zhenxiao; Cândido, Ladir; Hai, Guoqiang; Chen, Hua; Li, Yongxiang; Withers, Ray L.; Liu, Yun
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 11(2017)
• Page Start: 5436
• Page End: 5441
• Publication Date: 2017-02-27
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta08337d
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Electron-pinned defect dipoles, in the form of highly stable triangle-diamond and/or triangle-linear dopant defect clusters with well defined relative positions for Ti reduction, are present in rutile In + Ta co-doped TiO2 for the colossal permittivity and low loss. Abstract : 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. ε r > 10 4 with tan δ < 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.