六方晶W型フェライトSr_<1-x>Ba_x[ZnLi_<0.5>Fe_<0.5>]Fe_<16>O_<27>の結晶安定性と磁気特性 Crystal Stability and Magnetic Properties of W-type Hexagonal Ferrite Sr_<1-x>Ba_x[ZnLi_<0.5>Fe_<0.5>]Fe_<16>O_<27>

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Crystal stability and possibility as an anisotropic permanent magnet of W-type hexagonal ferrite with composition of Sr<SUB>1-x</SUB>Bax [ZnLi<SUB>0.5</SUB>Fe<SUB>0.5</SUB>]Fe<SUB>16</SUB>O<SUB>27</SUB> was investigated. In this study, we found that the amount of Fe<SUP>2+</SUP> in the calcined compound gradually increases with increasing Sr. In the ball-milled compound followed by annealing at 900-1100°C, W phase of Sr[ZnLi<SUB>0.5</SUB>Fe<SUB>0.5</SUB>]⋅Fe<SUB>16</SUB>O<SUB>27</SUB> partially decomposed into M phase and spinel phase. On the other hand, Ba [ZnLi<SUB>0.5</SUB>Fe<SUB>0.5</SUB>]Fe<SUB>16</SUB>O<SUB>27</SUB> remained a single phase. It can be assumed that Fe<SUP>2+</SUP> substituted for (Li<SUP>+</SUP><SUB>0.5</SUB>+Fe<SUP>3+</SUP><SUB>0.5</SUB>) or Zn<SUP>2+</SUP>, and oxidation such as Fe<SUP>2+</SUP>→Fe<SUP>3+</SUP> givies rise to decomposition.<BR>The grain size of Sr [ZnLi<SUB>0.5</SUB>Fe<SUB>0.5</SUB>]Fe<SUB>16</SUB>O<SUB>27</SUB> and Ba [ZnLi<SUB>0.5</SUB>Fe<SUB>0.5</SUB>]Fe<SUB>16</SUB>O<SUB>27</SUB> sintered at 1175-1225°C, respectively, was 0.3-5.0μm, their coercivity was less than 1000 Oe, and anisotropy energy (KA) and anisotropy field (HA) were estimated with about 60% of those of M-type ferrite. In conclusion, a preparation method of ferrite magnet hgaving more finer grains is necessitated for the practical use.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 43(8), 995-1000, 1996-08-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002012819
  • 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
    4012523
  • 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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