Effect of Al–Nb codoping on dielectric properties and breakdown strength of rutile TiO2 ceramics

Acceptor–donor codoping is gaining attention as a novel method for enhancing the intrinsic dielectric permittivity of TiO2 ceramics. Aiming at the application of TiO2 in high-voltage multilayer ceramic capacitors, this study investigated the dielectric properties and breakdown strength of TiO2 ceram...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2024/07/01, Vol.132(7), pp.304-311
Main Authors: Kawasaki, Mitsuha, Kuwano, Taro, Taniguchi, Hiroki, Fujihara, Shinobu, Hagiwara, Manabu
Format: Article
Language:eng ; jpn
Subjects:
Breakdown strength
Ceramics
Codoping
Dielectric breakdown
Dielectric loss
Dielectric permittivity
Dielectric properties
Dielectric strength
High temperature
Lattice vacancies
Multilayers
Permittivity
TiO2 ceramics
Titanium dioxide
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Acceptor–donor codoping is gaining attention as a novel method for enhancing the intrinsic dielectric permittivity of TiO2 ceramics. Aiming at the application of TiO2 in high-voltage multilayer ceramic capacitors, this study investigated the dielectric properties and breakdown strength of TiO2 ceramics doped with equimolar amounts of Al3+ and Nb5+ ions at a total doping concentration of up to 10.0 mol %. The dielectric permittivity was not increased by the codoping, but gradually decreased with increasing the codoping concentration. Meanwhile, a small amount of Al–Nb codoping (up to 2.0 mol %) suppressed dielectric loss at both room and elevated temperatures. The dielectric breakdown field was also significantly improved at up to 5.0 mol % codoping concentrations. The effects of Al–Nb codoping on the dielectric properties and breakdown strength are discussed in terms of microstructure, defect concentration, and mobility of charged oxygen vacancies.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.23212