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Synthesis and characterization of oxyanion (phosphate, sulfate) doped Ba$$_2$$Sc$$_2$$$$_-$$$$_y$$Ga$$_y$$O$$_5$$

Smith, Alaric and Shin, J. Felix and Slater, Peter.R. (2012) Synthesis and characterization of oxyanion (phosphate, sulfate) doped Ba$$_2$$Sc$$_2$$$$_-$$$$_y$$Ga$$_y$$O$$_5$$. Journal of Solid State Chemistry, 198. pp. 247-252. ISSN 0022-4596

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URL of Published Version: http://www.sciencedirect.com/science/article/pii/S0022459612006652

Identification Number/DOI: 10.1016/j.jssc.2012.10.018

In this paper we examine the effect of partial substitution of Ga for Sc in the oxyanion (phosphate, sulfate) containing perovskites, Ba2Sc$$_2$$$$_-$$$$_x$$P$$_x$$O$$_5$$$$_+$$$$_x$$ and Ba$$_2$$S$$_c$$$$_2$$$$_-$$$$_x$$S$$_x$$O$$_5$$$$_+$$3$$_x$$$$_/$$$$_2$$ with the samples analysed through a combination of X-ray diffraction, TGA, Raman spectroscopy and conductivity measurements. The results demonstrate that in both cases, Ga can be incorporated in place of Sc up to 40%. In order to accommodate the increasing Ga content, a reduction in the oxyanion content is required. Thus for the highest Ga content sample achieved, only 10% oxyanion incorporation was achieved giving endmember compositions of Ba$$_2$$S$$_c$$Ga$$_0$$$$_.$$$$_8$$P$$_0$$$$_.$$$$_2$$O$$_5$$$$_.$$$$_2$$ and Ba$$_2$$S$$_c$$Ga$$_0$$$$_.$$$$_8$$S$$_0$$$$_.$$$$_2$$O$$_5$$$$_.$$$$_3$$ for phosphate and sulfate doping respectively. While the Ga doping was shown to significantly improve the stability of the systems towards CO$$_2$$ containing atmospheres, conductivity measurements showed a reduction in the conductivity with increasing Ga content.

Type of Work: Article 24 October 2012 (Publication) Colleges (2008 onwards) > College of Engineering & Physical Sciences School of Chemistry solid oxide fuel cells Perovskite proton conductor QD Chemistry University of Birmingham Elsevier Plc 1258 YES

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