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Self-propagating high-temperature synthesis of ferrites MFe<inf>2</inf>O<inf>4</inf> (M = Mg, Ba, Co, Ni, Cu, Zn); reactions in an external magnetic field

Cross, WB; Afflcck, L; Kuznetsov, MV; Parkin, IP; Pankhurst, QA; (1999) Self-propagating high-temperature synthesis of ferrites MFe<inf>2</inf>O<inf>4</inf> (M = Mg, Ba, Co, Ni, Cu, Zn); reactions in an external magnetic field. Journal of Materials Chemistry , 9 (10) pp. 2545-2552. 10.1039/a904431k.

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Abstract

Spinel ferrites of the form MFe2O4 (M = Mg, Co, Ni, Cu, Zn) and rhombohedral BaFe2O4 have been prepared by self-propagating high- temperature synthesis (SHS) reactions from iron, cobalt, iron(III) oxide and metal(II) oxides or peroxides. The driving force for the reactions is the oxidation of iron or cobalt powder. Reactions were carried out in air, under an oxygen atmosphere or with the addition of sodium perchlorate as an internal oxidising agent. Reactions were also carried out in the presence of an external magnetic field of 1.1 T. Preorganisation of the reaction mixture in the applied field led to increases in the reaction velocity (from 2 to 5 mm s-1) and temperature (950 to 1050°C). The ratio of tetragonal to cubic phase observed for the CuFe2O4 product was increased by carrying out the reaction in the applied field. The inversion parameter observed for MgFe2O4 was also influenced by the applied field. All materials were characterised by X-ray powder diffraction (XRD), energy dispersive X-ray analysis (EDXA), scanning electron microscopy (SEM), FTIR, Mossbauer spectroscopy and vibrating sample magnetometry (VSM).

Type: Article
Title: Self-propagating high-temperature synthesis of ferrites MFe<inf>2</inf>O<inf>4</inf> (M = Mg, Ba, Co, Ni, Cu, Zn); reactions in an external magnetic field
DOI: 10.1039/a904431k
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
URI: http://discovery.ucl.ac.uk/id/eprint/31865
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