SOLID-PHASE SYNTHESIS OF CALCIUM FERRITE WITH BROWNMILLERITE STRUCTURE

DOI: 10.6060/tcct.20165912.5495
Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2016. V. 59. N 12. P. 45-48

The process of calcium ferrite preparing from ferrum (II) oxalate and calcium hy-droxide by solid-phase interaction was studied using data of X-ray diffraction, X-ray phase analysis, simultaneous thermal analysis, and scanning electron microscopy. X-ray phase analysis results of a sample subjected to heat treatment at 750 °C for 3 h, show formation of single-phase brownmillerite structure of calcium ferrite Ca2Fe2O5. Analysis of the DTA shows that crystallization process continues up to 1000 °C. Calculation of substructure parameters of Ca2Fe2O5 shows that the area of coherent X-ray scattering is 198 Ǻ, total amount of mi-crostrains is 0.8 %. The specific surface area of the sample is not more 5 m2/g.

Key words: calcium ferrite, solid phase synthesis, brownmillerite structure

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2016, Т. 59, № 12, Стр. 45-48

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