Investigation of the thermal stability of Mn ferrite particles synthesized by a modified co-precipitation method

Manganese ferrite particles with spinel structure were synthesized by a modified co-precipitation method, and then the thermal stability on their structural and magnetic properties was investigated by thermal annealing at different gas ambients. Experimental results showed that decomposition of metal oxides occurred when Mn ferrite particles with spinel structure were annealed under air ambient, while samples annealed in vacuum or argon remained in the spinel structural form. The highest saturation magnetization value of 58 emu/g was obtained when the sample was annealed at 400A degrees C in argon. The result showed that the thermal stability of MnFe2O4 was better under Ar ambient conditions or in vacuum.