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|Title:||A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3||Authors:||Li M.
De Souza R.A.
|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|
|Appears in Collections:||Staff Publications|
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