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Annealing temperature dependent structural and magnetic properties of MnFe2O4 nanoparticles grown by sol-gel auto-combustion method.
- Source :
-
Journal of Magnetism & Magnetic Materials . Jul2017, Vol. 433, p29-34. 6p. - Publication Year :
- 2017
-
Abstract
- Manganese ferrite (MnFe2O4) nanoparticles were synthesized by sol-gel auto-combustion method using manganese nitrate and ferric nitrate as precursors and citric acid as a fuel. Scanning electron micrographs show irregularly shaped morphology of the particles. The as-prepared samples were annealed at 400, 500, 600 and 800 °C for 2 h in air. The phase identification and structural characterizations were performed using powder X-ray diffraction technique along with Mössbauer spectroscopy. Magnetization loops and 57Fe Mössbauer spectra were measured at RT. After annealing the sample at or below - 500 °C, we observed two different spinel phases corresponding to two different lattice parameters. This is originating due to the partial oxidation of Mn2+ to Mn3+. At high annealing temperatures (- 600 °C or above) the spinel MnFe2O4 phase decomposes into crystalline α-Mn2O3 and α-Fe2O3 phases, and amorphous FeO phase. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03048853
- Volume :
- 433
- Database :
- Academic Search Index
- Journal :
- Journal of Magnetism & Magnetic Materials
- Publication Type :
- Academic Journal
- Accession number :
- 122413244
- Full Text :
- https://doi.org/10.1016/j.jmmm.2017.02.040