Abstract
The products of the thermal decomposition in air of iron/III/benzoate [Fe3/C6H5COO/6/OH/2]OH.H2O have been studied using conventional thermal analysis, X-ray diffraction measurements and mainly Mossbauer spectroscopy. The decomposition occurs in the temperature range 200–350°C. It was possible to identify benzoic acid and ferric oxide as final products. Above 300°C, the observed ferric oxide showed a particle size distribution, which depends on the heating temperature and the heating time interval, as evidenced by the following detected phases: superparamagnetic γ-Fe2O3 and magnetically ordered state with crystal structure of the phases γ-Fe2O3 and α-Fe2O3. Also, two iron/III/ benzoate complexes having four and three ligands within the coordination sphere are suggested as intermediate products.
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