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Self propagating high temperature synthesis of BaFe(12-x)Cr(x)O <inf>19</inf> and Li <inf>0.5</inf> Fe(2.5-x)Cr(x)O <inf>4</inf>

Parkin, IP; Kuznetsov, MV; Pankhurst, QA; (1999) Self propagating high temperature synthesis of BaFe(12-x)Cr(x)O <inf>19</inf> and Li <inf>0.5</inf> Fe(2.5-x)Cr(x)O <inf>4</inf>. Journal of Materials Chemistry , 9 (1) pp. 273-281. 10.1039/a803939i.

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Abstract

Thermal initiation of a mix of BaO 2 , Fe 2 O 3 , Cr 2 O 3 and iron powder in air induces a self propagating reaction with velocity 1-2 mm s -1 and the formation of predominantly BaFe(12-x)Cr(x)O 19 . Thermal initiation of a mixture of Li 2 O 2 , Fe 2 O 3 , Cr 2 O 3 and iron powder in air also induces a propagation wave with formation of predominantly Li 0.5 Fe(2.5-x)Cr(x)O 4 . Heating either product mixture to 1150-1200°C for 2 h produces phase pure crystalline powders of BaFe(12-x)Cr(x)O 19 and Li 0.5 Fe(2.5-x)Cr(x)O 4 . An external 1.1 T magnetic field increased the SHS synthesis wave velocity and temperature for both hard (BaFe(12-x)Cr(x)O 19 ) and soft ferrites (Li 0.5 Fe(2.5-x)Cr(x)O 4 ). Materials synthesised in a magnetic field showed significant changes in H(c), σ(max and σ(r) compared to those synthesized in zero field. All the samples were characterised by X-ray powder diffraction, FTIR, VSM, EDAX/SEM and Mossbauer spectroscopy.

Type: Article
Title: Self propagating high temperature synthesis of BaFe(12-x)Cr(x)O <inf>19</inf> and Li <inf>0.5</inf> Fe(2.5-x)Cr(x)O <inf>4</inf>
DOI: 10.1039/a803939i
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/31882
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