Studies on the formation of γ-Fe2O3 (maghemite) by thermal decomposition of ferrous oxalate dihydrate

Rao, Venkatesh ; Shashimohan, A. L. ; Biswas, A. B. (1974) Studies on the formation of γ-Fe2O3 (maghemite) by thermal decomposition of ferrous oxalate dihydrate Journal of Materials Science, 9 (3). pp. 430-433. ISSN 0022-2461

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Official URL: http://www.springerlink.com/content/t502843417r433...

Related URL: http://dx.doi.org/10.1007/BF00737843

Abstract

The thermal decomposition of ferrous oxalate dihydrate FeC2O42H2O, has been investigated using thermogravimetric (TG), differential thermogravimetric (DTG), differential thermal analysis (DTA), X-ray diffraction and infra-red spectroscopic techniques. The DTA data obtained in air consist of an endothermic dehydration peak at ~190°C and two exothermic peaks at ~245 and ~360°C. The first exotherm corresponds to the primary oxidative decomposition while the second one seems to be due to a structural transformation from a disordered or non-crystalline to a crystalline state of α-Fe2O3. Similar experiments carried out using a nitrogen atmosphere show an endothermic peak ~190°C followed immediately by an exothermic peak at 240°C. The final product of this decomposition has been identified as Fe3O4. The oxalate dihydrate containing traces of moisture decomposes in air under the ambient of its own gaseous products at 300°C to give ϒ-Fe2O3. This compound has been characterized by X-ray diffraction and magnetic hysteresis measurements.

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