CONVENIENT, LOW-ENERGY ROUTES TO HEXAGONAL FERRITES MF12O19 (M = SR, BA) FROM SHS REACTIONS OF IRON, IRON-OXIDE AND MO2 IN AIR

Authors
PARKIN IP ELWIN GE KOMAROV AV BUI QT PANKHURST QA BARQUIN LF MOROZOV YG
Citation
Ip. Parkin et al., CONVENIENT, LOW-ENERGY ROUTES TO HEXAGONAL FERRITES MF12O19 (M = SR, BA) FROM SHS REACTIONS OF IRON, IRON-OXIDE AND MO2 IN AIR, Journal of materials chemistry, 8(3), 1998, pp. 573-578
Citations number
31
Categorie Soggetti
Chemistry Physical","Material Science
Journal title
Journal of materials chemistry → ACNP
ISSN journal
09599428
Volume
8
Issue
3
Year of publication
1998
Pages
573 - 578
Database
ISI
SICI code
0959-9428(1998)8:3<573:CLRTHF>2.0.ZU;2-J
Abstract
Thermal initiation of a mix of metal superoxide (MO2, M = Sr, Ba), iro n and iron powder in air induces a self propagating reaction with velo city 0.5 mm s(-1) and the formation of predominantly MFe12O19. Heating the mixture to 1150 degrees C for 2 h produces pure crystalline MFe12 O19. The ferrites were characterised by X-ray powder diffraction (Riet veld analysis), FTIR, VSM magnetism, EDAX/SEM, electron probe analysis and Mossbauer spectroscopy. The ferrites showed good purity, coercivi ty, remanence and hysteresis loops compared to commercial samples. Pre paration of ferrite solid solutions MxM'yFe12O19 (M = Sr, Ba, Pb) was investigated.