UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Self propagating high-temperature synthesis of chromium substituted magnesium zinc ferrites Mg<inf>0.5</inf>Zn<inf>0.5</inf>Fe<inf>2-x</inf>Cr<inf>x</inf>O<inf>4</inf>(0 ≤ x ≤ 1.5)

Kuznetsov, MV; Pankhurst, QA; Parkin, IP; (1998) Self propagating high-temperature synthesis of chromium substituted magnesium zinc ferrites Mg<inf>0.5</inf>Zn<inf>0.5</inf>Fe<inf>2-x</inf>Cr<inf>x</inf>O<inf>4</inf>(0 ≤ x ≤ 1.5). Journal of Materials Chemistry , 8 (12) pp. 2701-2706. 10.1039/a804942d.

Full text not available from this repository.

Abstract

Magnesium ferrite MgFe2O4and chromium substituted magnesium-zinc ferrite Mg0.5Zn0.5Fe2-xCrxO4(0≤x≤ 1.5) have been made in air by self-propagating high temperature synthesis (SHS), a combustion process involving the reaction of magnesium, zinc, iron(III) and chromium(III) oxides with iron or chromium metal powders and sodium perchlorate. This produced an orange-yellow propagation wave of velocity 2-3 mm s-1. Two series of SHS samples were produced: series 1, SHS followed by annealing at 1400 °C for 2 h and series 2, SHS in a magnetic field of 1.1 T followed by annealing at 1400 °C for 2 h. X-Ray data showed that in all cases nearly phase pure cubic spinel ferrites were produced. Changes in the cubic lattice parameter were seen as a function of Zn and Cr content. Room temperature and 80 K Mössbauer data showed a significant change in sublattice occupancy with Cr content. Magnetic hysteresis data for series 1 and 2 showed that the coercive force of doped samples is higher than pure compositions whilst magnetisation is lower. It was also shown that the use of a magnetic field during SHS can influence the microstructure and magnetic properties of the final material.

Type: Article
Title: Self propagating high-temperature synthesis of chromium substituted magnesium zinc ferrites Mg<inf>0.5</inf>Zn<inf>0.5</inf>Fe<inf>2-x</inf>Cr<inf>x</inf>O<inf>4</inf>(0 ≤ x ≤ 1.5)
DOI: 10.1039/a804942d
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/33236
Downloads since deposit
0Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item