Influence of Oxygen Level on Structure and Ferromagnetism in Sn0.95Fe0.05O2 Nanoparticles

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This report discusses the effect of oxygen concentration at atmospheric pressure on the structural composition and ferromagnetism of nanoparticles of Fe doped SnO2. Sn0.95Fe0.05O2 was annealed under controlled atmospheres with gradually increasing oxygen concentrations (varying O2 from 0 to 106 ppm in N2). Prominent mass changes due to oxygen loss take place in the 0–5000 ppm range and the ferromagnetic properties. Ferromagnetism of Sn0.95Fe0.05O2 is inversely related to the oxygen concentration, which confirms the important role of oxygen vacancies this system. X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, and magnetometry studies confirm that the observed changes in the ferromagnetic properties are due to changes in the oxygen stoichiometry.