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We have demonstrated the synthesis of  γ -Fe 2 O 3  nano-particles through a facile and novel calcination process in the air. There is no  p H regulation, gas atmosphere, additive, centrifugation or other complicated procedures during the preparing process. A detailed formation process of the nano-particles is proposed, and DMF as a polar solvent may slower the reaction process of calcination. The structures, morphologies, and magnetic properties of  γ -Fe 2 O 3  nano-particles were investigated systematically, and the pure  γ -Fe 2 O 3  nano-particles obtained at 200 °C display uniform morphology good magnetic property. The saturation magnetization of obtained pure  γ -Fe 2 O 3  is about 74 emu/g, which is comparable with bulk material (76 emu/g) and larger than other results. In addition, the photocatalytic activity for degradation of methylene blue is also studied, which shows proper photocatalytic activity.

High saturation magnetization of γ-Fe2O3 nano-particles by a facile one-step synthesis approach