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The thermal behaviour of hydroxide mixtures, precursors to the synthesis of MgFe2O4 spinel powders, was investigated.

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Journal of Thermal Analysis and Calorimetry
Authors: F. Kovanda, V. Balek, V. Dorničák, P. Martinec, M. Mašláň, L. Bílková, D. Koloušek, and I. Bountseva

Abstract  

Thermal behaviour of synthetic pyroaurite-like anionic clay with molar ratio Mg/Fe=2 was studied in the range of 60-1100C during heating in air. TG/DTA coupled with evolved gas analysis, emanation thermal analysis (ETA), surface area measurements, XRD, IR and Mssbauer spectroscopy were used. Microstructure changes characterized by ETA were in a good agreement with the results of surface area measurements and other methods. After the thermal decomposition of the pyroaurite-like anionic clay, which took place mainly up to 400C, a predominantly amorphous mixture of oxides is formed. A gradual crystallization of MgO (periclase) and Fe2O3 (maghemite) was observed at 400-700C by XRD. The MgFe2O4 spinel and periclase were detected at 800-1100C. The spinel formation was also confirmed by Mssbauer spectroscopy.

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.04.002 . 10. Sivakumara , N , Narayanasamy , A , Greneche , JM , Murugaraj , R , Leed , YS . 2010 . Electrical and magnetic behaviour of nanostructured MgFe 2 O 4 spinel ferrite . J Alloys Compd . 504 : 395

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