Abstract
The oxygen-deficient perovskite phase SrFe1 –xSnxO3 –y(0 ⩽x⩽ 0.7) has been studied using 57Fe and 119Sn Mossbauer spectroscopy and X-ray powder diffraction. The oxygen content of each sample depends on its thermal history, and magnetic ordering occurs at low temperatures. The aggregation of oxygen vacancies to produce layers of tetrahedrally co-ordinated Fe3+ cations which occurs for x= 0 appears to be suppressed by the tin substitution. The supertransferred hyperfine field interaction at tin reveals a continuous distribution of fields, and the spectroscopic data are consistent with a delocalised-electron behaviour in which the more usual near-neighbour interactions are obscured by longer-range effects.
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