J. Ding et al., ULTRAFINE BAFE12O19 POWDER SYNTHESIZED BY MECHANOCHEMICAL PROCESSING, Journal of magnetism and magnetic materials, 177, 1998, pp. 931-932
Ultrafine BaFe12O19 powder has been synthesised by a novel mechanochem
ical preparation method. Mechanical milling of 1.2BaCl(2) + 12FeCl(3)
+ 38.4NaOH led to a mixture of NaCl and iron and barium hydroxide or o
xide-hydroxide. The formation of BaFe12O19 required annealing at 800 d
egrees C in air. A significant reduction of particle size was achieved
by dilution with NaCl. High coercivity values above 5 kOe were measur
ed for BaFe12O19 platelets of 20-100 nm in diameter and 10-20 nm thick
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