Investigation into the effect of sulfate and borate incorporation on the structure and properties of SrFeO3-δ

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Abstract

In this paper, we demonstrate the successful incorporation of sulfate and borate into SrFeO3-δ, and characterise the effect on the structure and conductivity, with a view to possible utilisation as a cathode material in Solid Oxide Fuel Cells. The incorporation of low levels of sulfate/borate is sufficient to cause a change from a tetragonal to a cubic cell. Moreover, whereas heat treatment of undoped SrFeO3-δ under N2 leads to a transformation to brownmillerite Sr2Fe2O5 with oxygen vacancy ordering, the sulfate/borate-doped samples remain cubic under the same conditions. Thus, sulfate/borate doping appears to be successful in introducing oxide ion vacancy disorder in this system.

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Jarvis, A., & Slater, P. R. (2017). Investigation into the effect of sulfate and borate incorporation on the structure and properties of SrFeO3-δ. Crystals, 7(6). https://doi.org/10.3390/cryst7060169

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