Reducibility and magnetic properties of nanosized ZnO substituted Fe₂O₃/TiO₂ system

Authors: Bahgat, M.; Khedr, M. H.; Abdelmaksoud, H. S.

Source: Materials Technology: Advanced Performance Materials, Volume 23, Number 1, March 2008 , pp. 39-44(6)

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Abstract:

Pure Fe₂O₃ and TiO₂ powder were mixed in molar ratio and fired in a muffle furnace at 1200°C for 4 h. The Fe₂TiO₅ compound formed was doped by replacing TiO₂ with calculated amounts of ZnO (ZnO fractions x=0·2, 0·4, 0·6, 0·8 and 1). The synthesised samples were characterised with X-ray diffraction (XRD) and their magnetic properties were measured using a vibrating sample magnetometer. Fe₂TiO₅, 2FeZnTiO₄, Fe₂ZnTi₃O₁₀, ZnTiO₃ and ZnFe₂O₄ phases were detected with very low magnetic properties corresponding to dilute magnetic semiconductors. Reduction tests in hydrogen at 500°C showed the reducibility of the undoped compound to be very low and to increase gradually with increasing Zn content in the ferrite phase. The reduction process caused a pronounced change in the magnetic properties.

Keywords: MAGNETIC PROPERTIES; NANOSIZED FERRITE; REDUCTION; TITANATE

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/175355508X266854

Publication date: 2008-03-01

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