BARIUM FERRITE BALL-MILLED IN VACUUM

Authors
CAMPBELL SJ WU E KACZMAREK WA WANG G
Citation
Sj. Campbell et al., BARIUM FERRITE BALL-MILLED IN VACUUM, Hyperfine interactions, 112(1-4), 1998, pp. 243-246
Citations number
13
Categorie Soggetti
Physics, Atomic, Molecular & Chemical","Physics, Nuclear","Physics, Condensed Matter
Journal title
Hyperfine interactions → ACNP
ISSN journal
03043843
Volume
112
Issue
1-4
Year of publication
1998
Pages
243 - 246
Database
ISI
SICI code
0304-3843(1998)112:1-4<243:BFBIV>2.0.ZU;2-6
Abstract
The structural and magnetic behaviour of BaFe12O19 subjected to millin g in vacuum for 1000 h has been investigated by x-ray powder diffracti on and Mossbauer effect spectroscopy techniques. Pronounced structural disorder is obtained along with partial decomposition of BaFe12O19 to alpha-Fe2O3 and evidence for superparamagnetic relaxation effects due to the fine particles produced on milling. Restoration of the fully c rystallised BaFe12O19 structure on annealing at 1000 degrees C is acco mpanied by a six fold enhancement in the magnetic coercivity. This beh aviour is linked with the fine crystallites.