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 Magnetic Properties of Co-Ni-Cr Spinel Ferrite Fine Particles with Giant Coercivity Prepared by the Chemical Coprecipitation Method

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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)<SUB>0.5</SUB>(NiO)<SUB>0.5−x</SUB>(Cr<SUB>2</SUB>O<SUB>3</SUB>)<SUB>0.5x</SUB>·n/2(Fe<SUB>2</SUB>O<SUB>3</SUB>), 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)<SUB>0.5</SUB>(NiO)<SUB>0.35</SUB>(Cr<SUB>2</SUB>O<SUB>3</SUB>)<SUB>0.075</SUB>·(Fe<SUB>2</SUB>O<SUB>3</SUB>). The typical magnetic properties were saturation magnetization σ<SUB>s</SUB>=33.9×10<SUP>−6</SUP> Wb·m/kg, coercivity H<SUB>cJ</SUB>=549.3 kA/m, K<SUB>1</SUB>=7.6×10<SUP>4</SUP> J/m<SUP>3</SUP>, K<SUB>2</SUB>=−36×10<SUP>4</SUP> J/m<SUP>3</SUP>, and anisotropy field H<SUB>A</SUB>=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 σ<SUB>s</SUB>=91.99×10<SUP>−6</SUP> Wb·m/kg, H<SUB>cJ</SUB>=1.39 MA/m, K<SUB>1</SUB>=22.8×10<SUP>5</SUP> J/m<SUP>3</SUP>, and K<SUB>2</SUB>=−128.6×10<SUP>5</SUP> J/m<SUP>3</SUP>. The value of H<SUB>A</SUB> can not measured because a measurement magnetic field was not enough.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 53(7), 617-624, 2006-07-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10018005725
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    8046122
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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