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Synthesis, structure and conductivity of sulfate and phosphate doped SrCoO3

Hancock, CA, Slade, RCT, Varcoe, JR and Slater, PR (2011) Synthesis, structure and conductivity of sulfate and phosphate doped SrCoO3 Journal of Solid State Chemistry, 184 (11). 2972 - 2977. ISSN 0022-4596

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Abstract

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.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Solid State Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Solid State Chemistry, 184 (11), November 2011, DOI 10.1016/j.jssc.2011.08.040 .
Divisions: Faculty of Engineering and Physical Sciences > Chemistry
Depositing User: Symplectic Elements
Date Deposited: 02 Dec 2011 14:04
Last Modified: 23 Sep 2013 18:47
URI: http://epubs.surrey.ac.uk/id/eprint/7394

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