Please use this identifier to cite or link to this item: https://doi.org/10.1038/nmat3782
Title: A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3
Authors: Li M.
Pietrowski M.J.
De Souza R.A.
Zhang H.
Reaney I.M.
Cook S.N. 
Kilner J.A.
Sinclair D.C.
Issue Date: 2014
Publisher: Nature
Citation: Li M., Pietrowski M.J., De Souza R.A., Zhang H., Reaney I.M., Cook S.N., Kilner J.A., Sinclair D.C. (2014). A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3. Nature Materials 13 (1) : 31-35. ScholarBank@NUS Repository. https://doi.org/10.1038/nmat3782
Abstract: Oxide ion conductors find important technical applications in electrochemical devices such as solid-oxide fuel cells (SOFCs), oxygen separation membranes and sensors. Na0.5Bi0.5TiO 3 (NBT) is a well-known lead-free piezoelectric material; however, it is often reported to possess high leakage conductivity that is problematic for its piezo- and ferroelectric applications. Here we report this high leakage to be oxide ion conduction due to Bi-deficiency and oxygen vacancies induced during materials processing. Mg-doping on the Ti-site increases the ionic conductivity to ~0.01 S cm-1 at 600 �C, improves the electrolyte stability in reducing atmospheres and lowers the sintering temperature. This study not only demonstrates how to adjust the nominal NBT composition for dielectric-based applications, but also, more importantly, gives NBT-based materials an unexpected role as a completely new family of oxide ion conductors with potential applications in intermediate-temperature SOFCs and opens up a new direction to design oxide ion conductors in perovskite oxides. � 2014 Macmillan Publishers Limited.
Source Title: Nature Materials
URI: http://scholarbank.nus.edu.sg/handle/10635/149256
ISSN: 14761122
DOI: 10.1038/nmat3782
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