Colossal permittivity of (Gd + Nb) co-doped TiO2 ceramics induced by interface effects and defect cluster

Material with high dielectric constant plays an important role in energy storage elements. (Gd + Nb) co-doped TiO2 (GNTO) ceramics with giant dielectric permittivity (>104), low dielectric loss, good temperature and frequency stability in broad range of 30–150 °C and 102–106 Hz have been systemat...

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Bibliographic Details
Published in:Ceramics international 2021-03, Vol.47 (5), p.6711-6719
Main Authors: Cao, Zhenzhu, Zhao, Jiajia, Fan, Jiangtao, Li, Guorong, Zhang, Hong
Format: Article
Language:English
Subjects:
Codoping
Dielectric constant
Rutile TiO2 ceramics
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Summary:Material with high dielectric constant plays an important role in energy storage elements. (Gd + Nb) co-doped TiO2 (GNTO) ceramics with giant dielectric permittivity (>104), low dielectric loss, good temperature and frequency stability in broad range of 30–150 °C and 102–106 Hz have been systematically characterized. Especially, a low dielectric loss of 0.027 and a giant dielectric permittivity of 5.63 × 104 at 1 kHz are attained for the composition with x = 0.01. Results of complex impedance spectroscopy, I–V curve and frequency dependent dielectric constant under DC bias indicate that internal barrier layer capacitance (IBLC) effect, electrode effect and electron-pinned defect-dipole (EPDD) effect contribute to the colossal permittivity (CP) property simultaneously.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2020.11.012