Abstract
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.
Similar content being viewed by others
References
Bassi P S, Randhawa B S and Sandeep Kaur 1989Advances in ferrites (Proceedings of ICF-5) (New Delhi: Oxford Publ. Co.) p. 67
Bhide V G 1973Mössbauer effect and its applications (New Delhi: Tata McGraw Hill Publ. Co.)
Cox D E, Shirane G and Ruby S L 1962Phys. Rev. 125 1163
Ferraro J R, Driver R, Walker W R and Wozniak W 1967Inorg. Chem. 6 1586
Greenwood N N and Gibb T C 1971Mössbauer spectroscopy (London: Chapman and Hall Ltd.)
Grenier J C, Wattiaux A, Fourner L, Pouchard M and Etourneau J 1997J. Phys. 7 C1-49
Kulkarni G U, Kannan K R, Arunarkavalli T and Rao C N R 1994Phys. Rev. B49 528
Nakamoto K 1970Infrared spectra of inorganic and coordination compounds (New York: John Wiley Interscience) 2nd ed.
Randhawa B S and Kamaljeet Sweety 1998J. Radioanal. Nucl. Chem. Letts 238 141
Randhawa B S, Prabhjinder Kaur and Kamaljeet Sweety 1996J. Radioanal. Nucl. Chem. 214 447
Vertes A, Korecz L and Burger K 1979Mössbauer spectroscopy (New York: Elsevier) p. 47
Viswanathan B and Murthy V R K 1990Ferrite materials (Berlin: Springer-Verlag)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Randhawa, B.S., Sweety, K. Calcium ferrite formation from the thermolysis of calcium tris (maleato) ferrate(III). Bull Mater Sci 23, 305–307 (2000). https://doi.org/10.1007/BF02720087
Issue Date:
DOI: https://doi.org/10.1007/BF02720087