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No.3(pp.103-127)

Home > Issues > Volume 8 (2003) > No.3(pp.103-127)

Magnetic Properties of Sr-ferrite Powder Prepared by Intensive Mechanical Milling Technique

Journal of Magnetics, Volume 8, Number 3, 30 Sep 2003, Pages 118-120

H.W. Kwon*

(School of Materials Science and Engineering, Pukyong National University), J.W. Bae(R＋D Centre, Pacific Metal Company)

Abstract

As an alternative promising way of producing high coercivity Sr-ferrite for a permanent magnet application, intensive mechanical milling process was applied to the raw materials of the Sr-ferrite with different composition. Synthesising reactivity for the Sr-ferrite of the mechanically milled raw material containing SrCO₃, La₂O₃, Fe₂O₃, Co₃O₄, and SiO₂was inferior to that of the raw material containing SrCO₃and Fe₂O₃, The Sr-ferrite prepared from mechanically milled raw materials had profoundly improved magnetic properties compared to the Sr-ferrite prepared by conventional method. Beneficial effect of the substituting (La₂O₃, Co₃O₄) and additive (SiO₂) oxides for improving the magnetic properties was not exploited in the Sr-ferrite prepared from the mechanically milled raw material. The Sr-ferrite powder prepared from the mechanically milled raw materials was magnetically isotropic in nature.

Keywords: SrO.Fe_2O_3; SrFe_12O_19; Sr-ferrite; intensive mechanical milling

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