학술논문

Síntese, liofilização e caracterização de acetato de 57Fe(III)
Document Type
article
Source
Química Nova, Vol 37, Iss 7, Pp 1132-1137 (2014)
Subject
iron acetate
freeze-drying
Mössbauer spectroscopy
Chemistry
QD1-999
Language
English
Spanish; Castilian
Portuguese
ISSN
1678-7064
0100-4042
Abstract
Iron(III) acetate was synthesized by the reflux method using iron enriched in the 57Fe isotope and the compound processed by freeze-drying. The as-synthesized and freeze-dried acetates were characterized regarding their structural, thermal, vibrational and hyperfine properties. Similar diffractometric and spectroscopic results were found for both materials and also for an industrial acetate made with natural iron. However, the microstructures differed: the as-synthesized compound showed flake morphology with micrometric dimensions, whereas the freeze-dried showed flake morphology with sub-micrometric dimensions. The activation energies for thermal decomposition, calculated from the exothermic events occurring in differential scanning calorimetry measurements, were 100.9 kJ/mol (as-synthesized) and 114.7 kJ/mol (freeze-dried).