Please use this identifier to cite or link to this item:
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.
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
ISSN: 14761122
DOI: 10.1038/nmat3782
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Jun 16, 2019


checked on Dec 24, 2018

Page view(s)

checked on May 22, 2019

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.