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Convenient, low energy routes to hexagonal ferrites MFe<inf>12</inf>O<inf>19</inf> (M = Sr, Ba) from SHS reactions of iron, iron oxide and MO<inf>2</inf> in air

Parkin, IP; Elwin, GE; Komarov, AV; Bui, QT; Pankhurst, QA; Barquín, LF; Morozov, YG; (1998) Convenient, low energy routes to hexagonal ferrites MFe<inf>12</inf>O<inf>19</inf> (M = Sr, Ba) from SHS reactions of iron, iron oxide and MO<inf>2</inf> in air. Journal of Materials Chemistry , 8 (3) pp. 573-578. 10.1039/a703774k.

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Abstract

Thermal initiation of a mix of metal superoxide (MO2, M = Sr, Ba), iron and iron powder in air induces a self propagating reaction with velocity 0.5 mm s-1 and the formation of predominantly MFe12O19. Heating the mixture to 1150°C for 2 h produces pure crystalline MFe12O19. The ferrites were characterised by X-ray powder diffraction (Rietveld analysis), FTIR, VSM magnetism, EDAX/SEM, electron probe analysis and Mössbauer spectroscopy. The ferrites showed good purity, coercivity, remanence and hysteresis loops compared to commercial samples. Preparation of ferrite solid solutions MxM′yFe12O19 (M = Sr, Ba, Pb) was investigated.

Type: Article
Title: Convenient, low energy routes to hexagonal ferrites MFe<inf>12</inf>O<inf>19</inf> (M = Sr, Ba) from SHS reactions of iron, iron oxide and MO<inf>2</inf> in air
DOI: 10.1039/a703774k
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/33324
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