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Synthesis and characterization of proton conducting oxyanion doped Ba2Sc2O5

Shin, J. Felix and Joubel, K and Apperley, D.C. and Slater, P.R. (2012) Synthesis and characterization of proton conducting oxyanion doped Ba2Sc2O5. Dalton Transactions, 41. pp. 261-266.

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In this paper we report the successful synthesis of the cubic oxyanion containing perovskites, Ba2Sc2-xPxO5+x (x=0.4, 0.5), with the samples analysed through a combination of X-ray diffraction, NMR, TGA, Raman spectroscopy and conductivity measurements. Conductivity measurements indicate a p-type contribution to the conductivity in oxidizing conditions at elevated temperatures, with evidence for proton conduction in wet atmospheres. For the latter bulk conductivities of 5.9 x 10-3 and 1.3 x 10-3 Scm-1 at 500○C were obtained for x=0.4 and 0.5 respectively, comparable to other perovskite proton conductors, while the stability towards CO2 containing atmospheres was improved compared to BaCeO3 based systems.
Related Si doped systems have also been prepared, although in this case small Ba2SiO4 impurities are observed. We also provide evidence to suggest that “undoped” Ba2Sc2O5 contains carbonate groups, which accounts for its thermal instability.

Type of Work:Article
Date:2012 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemistry
Keywords:solid oxide fuel cells; perovskite; proton conductor; scandate
Subjects:QD Chemistry
Institution:University of Birmingham
Copyright Holders:Royal Society of Chemistry
ID Code:1152
Refereed:YES
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