Abstract
The structural and magnetic behaviour of BaFe12O19 subjected to milling in vacuum for 1000 h has been investigated by x-ray powder diffraction and Mössbauer effect spectroscopy techniques. Pronounced structural disorder is obtained along with partial decomposition of BaFe12O19 to α-Fe2O3 and evidence for superparamagnetic relaxation effects due to the fine particles produced on milling. Restoration of the fully crystallised BaFe12O19 structure on annealing at 1000°C is accompanied by a six fold enhancement in the magnetic coercivity. This behaviour is linked with the fine crystallites.
Original language | English |
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Pages (from-to) | 243-246 |
Number of pages | 4 |
Journal | Hyperfine Interactions |
Volume | 112 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - 1998 |