| Popis: |
Iron(II) acetate anhydrous, (i) as received (FeAc) and (ii) processed by freeze-drying (FeAc-FD), were characterized structural, magnetic and morphologically by thermal analysis, scanning electron microscopy, thermogravimetry, differential scanning calorimetry and X-ray diffraction. As a result of these analyzes, it was found that the FeAc- FD type leaves showed a morphology with a thickness in the nanometer scale. The activation energy (Ea) for the exothermic events related to the decomposition of the above acetate was estimated in the range of 275-328 °C. Values for Ea equal to 100,225 and 127,824 kJ / mol were obtained for the FeAc and FeAc-FD, respectively. Mössbauer spectra showed as isomer shift (IS) characteristic of a Fe+3 to the FeAc-FD, and Fe+3 and Fe+2 to the FeAc. The results indicate that freeze-drying of FeAc could be used as a precursor to further processing method of decreasing the synthesis temperature. DOI: http://dx.doi.org/10.17807/orbital.v9i4.1006 |
