Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7886689 | Ceramics International | 2018 | 17 Pages |
Abstract
Sr0.99Ce0.01Ti1-xO3 (SCT, xâ¯=â¯0, ±â¯0.0025, ±â¯0.0050, 0.0075) ceramics were prepared by solid state reaction methods and sintered in air atmosphere at different temperatures, with a soaking time of 2â¯h. The dielectric properties of all samples presented excellent temperature independence over a broad temperature range from 25 to 330â¯â and frequency independence between 10â¯kHz and 1â¯MHz. Sr0.99Ce0.01Ti0.9925O3 (SCT0.9925) ceramics sintered in air atmosphere exhibited a high permittivity (~5400) and a low dielectric loss (~0.01) measured at room temperature and 1â¯kHz. XPS and complex impedance spectroscopy analysis confirmed that the high permittivity and low dielectric loss were attributed to the fully ionized oxygen vacancies and giant defect-dipoles in Ti-deficient samples. However, a higher dielectric loss of Ti-rich samples is owing to the destruction of giant defect dipoles, in which highly localized electrons were transformed into hopping electrons.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Xingxing Zhou, Minghe Cao, Zhijian Wang, Yun Rao, Qu Luo, Bo Yang, Hua Hao, Zhonghua Yao, Zhiyong Yu, Hanxing Liu,