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Self propagating high temperature synthesis of BaFe12-xCrxO19 and Li0.5Fe2.5-xCrxO4

Parkin, IP; Kuznetsov, MV; Pankhurst, QA; (1999) Self propagating high temperature synthesis of BaFe12-xCrxO19 and Li0.5Fe2.5-xCrxO4. In: JOURNAL OF MATERIALS CHEMISTRY. (pp. 273 - 281). ROYAL SOC CHEMISTRY

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Abstract

Thermal initiation of a mix of BaO2, Fe2O3, Cr2O3 and iron powder in air induces a self propagating reaction with velocity 1-2 mm s(-1) and the formation of predominantly BaFe12-xCrxO19. Thermal initiation of a mixture of Li2O2, Fe2O3, Cr2O3 and iron powder in air also induces a propagation wave with formation of predominantly Li0.5Fe2.5CrxO4. Heating either product mixture to 1150-1200 degrees C for 2 h produces phase pure crystalline powders of BaFe12-xCrxO19 and Li0.5Fe2.5-xCrxO4. An external 1.1 T magnetic field increased the SHS synthesis wave velocity and temperature for both hard (BaFe12-xCrxO19) and soft ferrites (Li0.5Fe2.5-xCrxO4). Materials synthesised in a magnetic field showed significant changes in H-c, sigma(max) and sigma(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: Proceedings paper
Title: Self propagating high temperature synthesis of BaFe12-xCrxO19 and Li0.5Fe2.5-xCrxO4
Event: 1st Materials Chemistry Discussion Meeting on Solid State Chemistry - Novel Syntheses and New Materials
Location: INST CHIM MATIERE CONDENSEE, BORDEAUX, FRANCE
Dates: 1998-09-24 - 1998-09-26
Keywords: STATE-PRECURSOR SYNTHESIS, METAL NITRIDES, CATION DISTRIBUTION, ROUTES, METATHESIS, STRONTIUM, MOSSBAUER, SRFE12O19, LIFE5O8
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/77410
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