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)Angstrom, b = 16.234(2)Angstrom, c = 5.3717(6)Angstrom. Incomplete order of the oxygen vacancies is best described using the space group Icmm. The oxygen content can readily be varied to form Sr2MnGaO5 + delta (0 less than or equal to delta less than or equal to 0.5) to provide Mn oxidation states between Mn(III) and Mn(IV).
- Manganese oxide
- Layered material