書誌事項
- タイトル別名
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- Magnetic Properties of Co-Ni-Cr Spinel Ferrite Fine Particles with Giant Coercivity Prepared by the Chemical Coprecipitation Method
- 化学的共沈法による巨大保磁力を有するCo-Ni-Cr系スピネル微粒子の磁気特性
- カガクテキ キョウチンホウ ニ ヨル キョダイホジリョク オ ユウスル Co Ni Crケイ スピネル ビリュウシ ノ ジキ トクセイ
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An experiment was carried out to investigate the effect of Cr substitution on the magnetic and physical properties of Co-Ni spinel ferrite fine particles by the chemical coprecipitation method without post annealing. The chemical coprecipitation compositions were chosen according to the formula (CoO)0.5(NiO)0.5−x(Cr2O3)0.5x·n/2(Fe2O3), where x varied between 0 and 0.2, and n between 2.0 and 2.5. Good magnetic properties were achieved with materials of composition (CoO)0.5(NiO)0.35(Cr2O3)0.075·(Fe2O3). The typical magnetic properties were saturation magnetization σs=33.9×10−6 Wb·m/kg, coercivity HcJ=549.3 kA/m, K1=7.6×104 J/m3, K2=−36×104 J/m3, and anisotropy field HA=5.57 MA/m. Furthermore, the particles were tried to etch in the diluted sulfuric acid solution (concentration 0.5∼2.0%, etching time 6∼30 h) for the purpose of removing super paramagnetic fine particles. Good magnetic properties were achieved with materials of concentration 1.5% and etching time 24h. The typical magnetic properties were σs=91.99×10−6 Wb·m/kg, HcJ=1.39 MA/m, K1=22.8×105 J/m3, and K2=−128.6×105 J/m3. The value of HA can not measured because a measurement magnetic field was not enough.
収録刊行物
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- 粉体および粉末冶金
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粉体および粉末冶金 53 (7), 617-624, 2006
一般社団法人 粉体粉末冶金協会
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詳細情報 詳細情報について
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- CRID
- 1390001206308198016
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- NII論文ID
- 10018005725
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- NII書誌ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL書誌ID
- 8046122
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 使用不可