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- Title
Colossal dielectric behavior of (Ho, Ta) co‐doped rutile TiO2 ceramics.
- Authors
Fan, Jiangtao; Long, Zhen; Zhou, Haitao; He, Gang; Hu, Zhanggui
- Abstract
The dielectric properties of (Ho, Ta) co-doped rutile TiO2 (HTTO) ceramics with various dopant concentrations prepared by solid-state reaction method were investigated. The effect of (Ho, Ta) co-doping concentration on the microstructure and dielectric properties of the obtained ceramics were studied in detail. A high dielectric constant (3.35 × 104), low dielectric loss (0.021), and excellent frequency and temperature stability (-150–150 °C and 102–5⋅106 Hz) were achieved in an optimum composition of (Ho0.5Ta0.5)0.01Ti0.99O2. The origin of the colossal permittivity (CP) behavior of HTTO ceramics was discussed by XPS, XRD, SEM, and complex impedance spectroscopy. It was indicated that the high CP and low dielectric loss might be attributed to combined contribution of the internal barrier layer capacitance (IBLC) effect, electron-pinned defect-dipole (EPDD) effect, and electrode effect.
- Subjects
DIELECTRIC properties; DIELECTRICS; RUTILE; DIELECTRIC loss; PERMITTIVITY; CERAMICS; HOLMIUM
- Publication
Journal of Materials Science: Materials in Electronics, 2021, Vol 32, Issue 11, p14780
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-021-06032-z