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Defect chemistry and electrical properties of sodium bismuth titanate perovskite

Yang, F.; Li, M.; Li, L.; Wu, P.; Pradal-Vel�zquez, E.; Sinclair, D. C.


F. Yang

Associate Professor

L. Li

P. Wu

E. Pradal-Vel�zquez

D. C. Sinclair


The ferroelectric perovskite Na0.5Bi0.5TiO3, NBT, can exhibit three types of electrical behaviour, i.e. oxide-ion conduction (type I), mixed ionic–electronic conduction (type II) and insulating/dielectric (type III) based on various defect mechanisms. Here we review how to tune the electrical properties of NBT via several mechanisms, including A-site Na or Bi non-stoichiometry, isovalent substitution, and acceptor- and donor-doping. The diversity of the electrical behaviour in the NBT lattice is attributed to the high level of oxide-ion conductivity originating from highly mobile oxygen ions which can be fine-tuned to optimise or suppress ionic conduction. High oxide-ion conductivity can be obtained by manipulating the starting Na/Bi ≥1 and by acceptor-doping to make NBT a potential electrolyte material for intermediate temperature solid oxide fuel cells (IT-SOFCs). In contrast, the oxide-ion conduction can be partially or fully suppressed by having a starting (nominal) composition with Na/Bi less than 1, donor-doping, or utilising the trapping effect between oxygen vacancies and some B-site acceptor dopants. This significantly reduces the dielectric loss and makes NBT-based materials excellent candidates as high-temperature dielectrics for capacitor applications.


Yang, F., Li, M., Li, L., Wu, P., Pradal-Velázquez, E., & Sinclair, D. C. (2018). Defect chemistry and electrical properties of sodium bismuth titanate perovskite. Journal of Materials Chemistry A, 6(13), 5243-5254.

Journal Article Type Article
Acceptance Date Nov 23, 2017
Online Publication Date Nov 28, 2017
Publication Date Mar 27, 2018
Deposit Date Dec 23, 2018
Publicly Available Date Jan 7, 2019
Journal Journal of Materials Chemistry A
Print ISSN 2050-7488
Electronic ISSN 2050-7496
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 6
Issue 13
Pages 5243-5254
Public URL
Publisher URL!divAbstract


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