共沈法によるバリウムフェライト粉末の作製とその磁気特性に及ぼす粒径分布の影響

Makled M.　H.; 松井 利之; 津田 大; 間渕 博; El-Mansy M.　K.; 森井 賢二

doi:10.2109/jcersj.112.200

Papers

Effect of Particle Size and Its Distribution on the Fabrication and Magnetic Properties of Barium Ferrite Powders Prepared from Coprecipitated Precursors

Mahmoud Hossny MAKLED, Toshiyuki MATSUI, Hiroshi TSUDA, Hiroshi MABUCHI, Mabrouk Kamel El-MANSY, Kenji MORII

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Keywords: Barium ferrite, Particle size, High coercivity, Porosity, Coprecipitation

JOURNAL FREE ACCESS

2004 Volume 112 Issue 1304 Pages 200-203

DOI https://doi.org/10.2109/jcersj.112.200

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Abstract

Six kinds of powder samples with a different particle size and its distribution have been prepared from coprecipitated precursors by light grinding followed by sieving, and calcined in air to form the barium ferrite (BaFe₁₂O₁₉) phase. Correlation between the particle morphology and Fe/Ba molar ratio or magnetic properties has been examined. The results indicated that the powders consisting of coarse particles (100-200 μm) exhibit a single phase of BaFe₁₂O₁₉, and a higher saturation magnetization and coercivity than the powders having fine particles or a wide size distribution. The optimized powders showed a high coercivity of 5.85 kOe and a saturation magnetization of 71 emu/g that are closed to the theoretical values.

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