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Persistent URL http://purl.org/net/epubs/work/65579
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Record Id 65579
Title Cation, vacancy and spin ordered 15R-superstructures in Sr(Cr1-xFex)O3-y (0.4 = x = 0.6) perovskites
Abstract 15-layer rhombohedral (15R) SrCrO2.8-type superstructures have been discovered in Sr(Cr1-xFex)O3-y perovskites (0.4 ? x ? 0.6; space group R3?m; a ? 5.56 and c ? 34.6 Å). Cr/Fe cations are segregated between layers of tetrahedrally and octahedrally coordinated sites. The 15R-Sr(Cr1-xFex)O3-y materials are semiconducting and order ferrimagnetically below 225–342 K. The magnetic structure of an x = 0.5 sample shows spin canting consistent with a simple spin disorder model. Samples with x ? 0.7 have a disordered cubic perovskite structure, and we propose that locally reconstructed (111) planes like those in the 15R materials facilitate oxide ion migration in Cr-based perovskite mixed conductors used in solid oxide fuel cells.
Organisation ISIS , ISIS-HRPD , STFC
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Language English (EN)
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Journal Article Chem Mater 25, no. 11 (2013): 2346-2351. doi:10.1021/cm401062u 2013