Abstract
A new layered manganese oxide, Sr2MnGaO5, has been synthesised and Rietveld analysis of X-ray powder diffraction data has shown it to be an oxygen deficient perovskite with the brownmillerite structure: a = 5.5033(6) A, b = 16.234(2) A, c = 5.3717(6) A. Incomplete order of the oxygen vacancies is best described using the space group Icmm. The oxygen content can readily be varied to form Sr2MnGaO5 + δ (0 ≤ δ ≤ 0.5) to provide Mn oxidation states between Mn(III) and Mn(IV).
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