Crystal structure and magnetism of the double perovskite Sr3Fe2MoO9: a neutron diffraction study

M.C. VIOLA; J.A. ALONSO; J.C. PEDREGOSA; R.E. CARBONIO

Wiley Interscience

Lugar: Weinheim, Alemania; Año: 2005 p. 1559 - 1559

he Sr3Fe2MoO9 double perovskite has been prepared in polycrystalline form by heat treatment, in air, from previously decomposed citrate precursors. This material has been studied by X-ray (XRD), neutron powder diffraction (NPD) and magnetic measurements. At room temperature, the crystal structure is tetragonal, space group I4/m, with a = b = 5.5608(2) Å, c = 7.8471(4) Å. It is convenient to write the crystallographic formula as Sr2Fe(Fe1/3Mo2/3)O6, according to the usual nomenclature for double perovskites A2B´B´´O6. The structure contains alternating FeO6 and (Fe,Mo)O6 octahedra, tilted by 3.9° in the basal ab plane. Magnetic measurements indicate a weak ferromagnetic behavior below TC = 280 K. Ideally, the Sr3Fe2MoO9 double perovskite only contains Fe3+ and Mo