Crystal Structure of the Novel Complex Cobalt Oxide Sr0.7Y 0.3CoO2.62

S. Ya Istomin, J. Grins, G. Svensson, O. A. Drozhzhin, V. L. Kozhevnikov, E. V. Antipov, J. P. Attfield

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109 Citations (Scopus)

Abstract

The perovskite-related crystal structure of the compound Sr 0.7Y0.3CoO2.62 was determined and refined using synchrotron X-ray and neutron powder diffraction, in space group I4/mmm, a = 7.6237(8) Å and c = 15.314(2) Å, to RI = 0.041 in the synchrotron data set. It contains layers. of CoO6 octahedra, perpendicular to the c axis, alternating with partially disordered oxygen-deficient layers. Further characterization of the structure using electron diffraction and high-resolution electron microscopy showed that an additional superstructure was present in some of the crystallites. The structure represents a new type of layered ordering of oxygen vacancies in oxygen-deficient perovskites. Possible local atom arrangements in the oxygen-deficient layers and the structural relationship to the resembling brownmillerite-type structure for ABO2.5 compounds are discussed.

Original languageEnglish
Pages (from-to)4012-4020
Number of pages9
JournalChemistry of Materials
Volume15
Issue number21
DOIs
Publication statusPublished - 21 Oct 2003
Externally publishedYes

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