Oxyanion doping strategies to enhance the ionic conductivity in Ba2In2O5

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In this paper we report the successful incorporation of phosphate and sulphate groups into the ionic conductor, Ba2In2O5, with the samples analysed through a combination of X-ray diffraction, NMR, TGA, Raman spectroscopy and conductivity measurements. The results show that such oxyanion incorporation leads to a conversion from an ordered brownmillerite-type structure to a disordered perovskite-type, and hence increases the conductivity at temperatures <800○C. In wet atmospheres, there is evidence for a significant enhancement of the conductivity through a protonic contribution.


Original languageEnglish
Pages (from-to)874-879
Number of pages6
JournalJournal of Materials Chemistry
Issue number3
Publication statusPublished - 1 Jan 2011