Fine barium hexaferrite powder prepared by the crystallisation of glass

被引:211
作者
Rezlescu, L [1 ]
Rezlescu, E [1 ]
Popa, PD [1 ]
Rezlescu, N [1 ]
机构
[1] Inst Tech Phys, Iasi 6600, Romania
关键词
barium ferrite; fine particles; X-ray diffraction; magnetization; coercivity;
D O I
10.1016/S0304-8853(98)00442-9
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In the present work, the glass strips (with dimensions 50 mm long, 6 mm wide and about 30-100 mu m thickness) of the system Fe2O3-BaO-B2O3-Sb2O3 were subjected to heat treatments between 200 degrees C and 780 degrees C. The irreversible structure changes on the thermal annealings were studied by X-ray diffraction and by magnetic measurements. Crystallization of Ba ferrite at temperatures higher than 550 degrees C was observed. The magnetic properties (specific magnetisation sigma and coercivity H-c) in terms of the evolution of size of BaFe12O19 crystals, dispersed in the glassy matrix were discussed. The particles produced by this method satisfy the stringent requirements better than the powders made by milling the polycrystalline materials manufactured by the usual ceramic way of preparation. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:288 / 290
页数:3
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