Influence of annealing temperature on MnFe2O4 nanoparticles

What is it about?

Nanoparticles of manganese ferrite were obtained by the impregnation of highly ordered mesoporous MCM-41 silica support. The obtained nanocrystallites were strongly dispersed in silica matrix and their size was about 2 nm. The sample annealing at 500 Celsius degrees led to increase of particle size to about 5 nm. The Mössbauer spectroscopy investigations show on occurrence of MnFe2O4 nanoparticle in superparamagnetic state for the sample annealed in all temperatures. The coexistence of superparamagnetic and ferromagnetic phase was observed at liquid nitrogen temperature. The sample annealed at 400 Celsius degrees and 500 Celsius degrees has bigger manganese ferrite particle and better crystallized structure.

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