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Issue 1, 2017
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Hard–soft chemistry of Sr1−xCaxCrO3–δ solid solutions

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Sr1−xCaxCrO3−δ (x = 0.25, 0.50, 0.75) solid solutions have been synthesised using the ‘hard–soft’ technique and structurally characterised. Sr1−xCaxCrO3 phases were prepared under ‘hard’ high pressure and high temperature synthesis and then reduced at ‘soft’ low temperature conditions. Analysis by powder X-ray diffraction and Rietveld refinements reveals that the reduction of each composition gives two crystalline products, with 6H and 15R structure types previously reported in SrCrO3−δ. analogues. These results demonstrate that the 6H and 15R structures are stable for very high calcium contents up to x = 0.75 in Sr1−xCaxCrO3−δ, although different structural motifs are observed for CaCrO3−δ. The Sr1−xCaxCrO3−δ phase diagram shows that the lower temperature for superstructure formation has a maximum near x = 0.5, evidencing an influence of Ca/Sr cation disorder on oxygen vacancy order.

Graphical abstract: Hard–soft chemistry of Sr1−xCaxCrO3–δ solid solutions

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The article was received on 22 Jul 2016, accepted on 22 Sep 2016 and first published on 30 Sep 2016

Article type: Research Article
DOI: 10.1039/C6QM00136J
Citation: Mater. Chem. Front., 2017,1, 172-175
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    Hard–soft chemistry of Sr1−xCaxCrO3–δ solid solutions

    A. M. Arevalo-Lopez, A. Srinath and J. P. Attfield, Mater. Chem. Front., 2017, 1, 172
    DOI: 10.1039/C6QM00136J

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