Dielectric response of TiO2 ceramics: The crucial role of Ta2O5

JOURNAL OF ALLOYS AND COMPOUNDS

卷:704

Article

Shang, Baoqiang¹  Liang, Pengfei¹  Li, Fuchao¹  Chao, Xiaolian¹  Wei, Lingling²  Yang, Zupei¹ 

[1] Shaanxi Normal Univ, Sch Mat Sci & Engn, Key Lab Macromol Sci Shaanxi Prov, Xian 710062, Shaanxi, Peoples R China

[2] Shaanxi Normal Univ, Sch Chem & Chem Engn, Key Lab Macromol Sci Shaanxi Prov, Xian 710062, Shaanxi, Peoples R China

关键词: Ta-doped TiO2;    Giant permittivity;    Low dielectric loss;    Temperature stability;    XPS analysis;   

DOI  :  10.1016/j.jallcom.2017.02.049

来源: Elsevier

【 摘 要 】

Colossal permittivity in tantalum-doped TiO2 (TaxTi1-xO2) (x = 1%, 2%, 3%, 4%, 5% and 6%) fabricated by the conventional solid-state reaction method in N-2 atmosphere were achieved. Especially, by optimizing components and sintering temperatures, the dielectric loss could significantly decreased. The effects of Ta doping on their microstructure, dielectric properties, and temperature stability were revealed in detail. When the composition with x = 5% and sintered at 1400 degrees C, the dielectric constant reached to -30000 and the dielectric loss decreased to 3%. Interestingly, all the samples also exhibit good temperature stability of dielectric properties in a wide temperature range from 100 to 350 K Based on XPS analysis, the formation of defect-dipole clusters, e.g. 2(Ta5+)(Ti) -> 4(Ti3+)(Ti)V-<-(o) should be mainly responsible for the improved dielectric properties in tantalum-doped TiO2. (C) 2017 Elsevier B.V. All rights reserved.

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