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Synthesis, structure and conductivity of sulfate and phosphate doped SrCoO3

Hancock, C and Slade, R and Varcoe, J and Slater, Peter.R. (2011) Synthesis, structure and conductivity of sulfate and phosphate doped SrCoO3. Journal of Solid State Chemistry, 184 (11). pp. 2972-2977.

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URL of Published Version: http://www.sciencedirect.com/science/article/pii/S0022459611004804

Identification Number/DOI: 10.1016/j.jssc.2011.08.040

In this paper we report the successful incorporation of sulfate and phosphate into SrCoO3 leading to a change from a 2H– to a 3C–perovskite polymorph. Structural characterization by neutron diffraction showed extra weak peaks related to oxygen vacancy ordering, and these could be indexed on an expanded tetragonal cell, containing two inequivalent Co sites, similar to previously reported for Sb doped SrCoO3. Conductivity measurements on the doped systems showed a large enhancement compared to the undoped hexagonal system, consistent with corner–sharing of CoO6 octahedra for the former. Further work on the doped samples shows, however, that they are metastable, transforming back to the hexagonal cell on annealing at intermediate temperatures. The incorporation of Fe was shown, however, to improve the stability at intermediate temperatures, and these co–doped phases also showed high conductivities.

Type of Work:Article
Date:01 November 2011 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemistry
Keywords:solid oxide fuel cell, cathode, perovskite, sulfate, phosphate
Subjects:QD Chemistry
Institution:University of Birmingham
Copyright Holders:Elsevier
ID Code:1148
Refereed:YES
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