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Issue 13, 2018
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Defect chemistry and electrical properties of sodium bismuth titanate perovskite

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Abstract

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 <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.

Graphical abstract: Defect chemistry and electrical properties of sodium bismuth titanate perovskite

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Publication details

The article was received on 20 Oct 2017, accepted on 23 Nov 2017 and first published on 28 Nov 2017


Article type: Review Article
DOI: 10.1039/C7TA09245H
Citation: J. Mater. Chem. A, 2018,6, 5243-5254
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    Defect chemistry and electrical properties of sodium bismuth titanate perovskite

    F. Yang, M. Li, L. Li, P. Wu, E. Pradal-Velázquez and D. C. Sinclair, J. Mater. Chem. A, 2018, 6, 5243
    DOI: 10.1039/C7TA09245H

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