Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7061860 | Thermochimica Acta | 2018 | 30 Pages |
Abstract
Manganese ferrite/carbon (MnFe2O4/C) composites were prepared by the thermal decomposition of Mn(NO3)2-Fe(NO3)3-polyvinyl alcohol (PVA) gels with different PVA content. Thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) as well as the Fourier-transform infrared spectroscopy (FTIR) confirmed the redox interaction between PVA and nitrate ions at around 100â°C. The effect of experimental conditions such as annealing temperature, reaction atmosphere (air, nitrogen), opened or covered crucibles for obtaining manganese ferrite as single crystalline phase was investigated. Manganese ferrite as single crystalline phase was obtained by annealing the precursor in air at 400â°C for 3âh in covered crucibles. The saturation magnetization of MnFe2O4/C composites decreased with the increase of the carbon amount from 47.9âemuâgâ1 to 18.5âemuâgâ1 and was correlated with the PVA content. The saturation magnetization of the sample with the highest carbon content increased from 0.1âemuâgâ1 to 24.6âemuâgâ1 by growing the annealing temperature from 300 to 600â°C.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Eliza Muntean, Marcela Stoia, Cornelia PÄcurariu,