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    • B S Randhawa

      Articles written in Bulletin of Materials Science

    • Volume 23 Issue 4 August 2000 pp 305-307 Material Synthesis

      Calcium ferrite formation from the thermolysis of calcium tris (maleato) ferrate(III)

      B S Randhawa Kamaljeet Sweety

      More Details Abstract Fulltext PDF

      For preparing calcium ferrite, calcium tris (dmaleato) ferrate(III) precursor was prepared by mixing aqueous solutions of iron(III) maleate, calcium maleate and maleic acid. Various physico-chemical techniques i.e. TG, DTG, DTA, Mössbauer, XRD, IR etc have been used to study the decomposition behaviour from ambient to 900°C and ferrite formation. Three consecutive decomposition steps leading to the formation of α-Fe2O3 and calcium carbonate have been observed at various stages of thermolysis. In the final stage the ferrite, bdCa2Fe2O5, is obtained as a result of solid state reaction between α-Fe2O3 and calcium carbonate at 788°C, a temperature much lower than for ceramic method. The results have been compared with those of the oxalate precursor.

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