A study of the new perovskite solid solution series SrFe xRu 1- xO 3- y by ruthenium-99 and iron-57 Mössbauer spectroscopy
The magnetic and structural properties of the solid solution SrFe xRu 1- xO 3- y (0 ⩽ x ⩽ 0.5) have been studied using 57Fe and 99Ru Mössbauer spectroscopy and other techniques. These phases, which are here reported for the first time, have a distorted perovskite structure. The iron substitutes exclusively as Fe 3+ and thereby causes oxygen deficiency, but has little effect on the magnetic behaviour of the Ru 4+ until x > 0.2, whereupon the metallic band system begins to revert to a localized electron structure. The properties of a sample with x = 0.3 are complex and intermediate in character. For x > 0.3 the oxygen deficiency is reduced by substantial oxidation to Ru 5+ until at x = 0.5 the system corresponds to Sr 2Fe 3+Ru 5+O 6.