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Iron(II) sulphate heptahydrate undergoes decomposition in the presence of basic beryllium carbonate without any interaction with the carbonate. The components of the mixture decompose individually. Iron(II) sulphate decomposes with the formation of tetrahydrate, monohydrate, anhydrous salt, oxysulphate and ferric sulphate as intermediate phases. The basic beryllium carbonate decomposes to the oxide with BeO·BeCO3 as the intermediate compound.

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The thermal decomposition of iron(II) sulphate heptahydrate was carried out in air under dynamic conditions in the presence of lithium, sodium, potassium and rubidium carbonates. The decomposition path in the presence of lithium carbonate differs from that in the presence of the other carbonates. In the presence of lithium carbonate, the heptahydrate loses all the water molecules before entering into reaction with the carbonate. The anhydrous sulphate then reacts with the carbonate, presumably to form iron(II) carbonate, which in turn undergoes decomposition — oxidation via magnetic oxide to ferric oxide. In the case of the other carbonates, iron(II) sulphate enters into reaction with the carbonate in question even before dehydration is complete, to form ferrous carbonate, which in turn reacts with the moisture still present to form green iron(II) hydroxide. This compound then undergoes decomposition — oxidation reactions via magnetic oxide to ferric oxide.

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Thermal analysis of ferrous sulphate heptahydrate in air

II. The oxidation-decomposition path

Journal of Thermal Analysis and Calorimetry
Authors: M. S. R. Swamy, T. P. Prasad, and B. R. Sant

The thermal decomposition of ferrous sulphate heptahydrate was carried out in air under dynamic and isothermal conditions. The intermediate phases were identified by chemical analysis and an X-ray technique. Ferrous sulphate heptahydrate is converted to tetrahydrate and monohydrate, but this conversion is accompanied by oxidation. Fe(OH)SO4 and Fe2O(SO4)2 are formed as oxidation products, and the latter decomposes to ferric oxide directly and/or through Fe2(SO4)3.

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Thermal analysis of ferrous sulphate heptahydrate in air

Part I. Some general remarks and methods

Journal of Thermal Analysis and Calorimetry
Authors: M. S. R. Swamy, T. P. Prasad, and B. R. Sant

The literature on thermal analysis of ferrous sulphate heptahydrate in air is reviewed. The oxidation-decomposition of ferrous sulphate heptahydrate is a complex function of experimental conditions. Some general methods including those developed by the authors for the purpose of analyzing various intermediates encountered during the oxidation-decomposition of the heptahydrate are presented and discussed.

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