Preparation and characterization of tin-doped spinel ferrite

Abstract: The chemical preparation of a tin-doped spinel ferrite via the co-precipitation method rendered a sample containing 48.2mass% Fe3+, 11.8mass% Fe2+ and 13.0mass% Sn. Powder X-ray diffractometry data collected with synchrotron radiation source revealed the co-existence of two crystallographic phases: one with cubic (spatial group, Fd3m) spinel and other with trigonal–hexagonal () structure. 57Fe Mössbauer spectroscopy analysis confirmed the occurrence of two tin-doped phases, with relative spectral areas of 50.6% and 49.4%; deduced chemical structures of these two phases correspond to and , (⊕, cation vacancy), respectively. The measured value for saturation magnetization σ =30JT−1 kg−1 for this sample leads to a Sn4+-ferrite with σ =60JT−1 kg−1. The magnetic hyperfine field detected with 119Sn Mössbauer spectroscopy was interpreted as being due to a supertransferred magnetic moment from iron cations to Sn4+ in octahedral sites of these iron oxides lattices. [ABSTRACT FROM AUTHOR]