Crystal Stability and Magnetic Properties of W-type Hexagonal Ferrite Sr1-xBax(ZnLi0.5Fe0.5)Fe16O27.

• Suwa Kenichiro

  Materials Research Center, TDK Corporation

• Taguchi Hitoshi

  Materials Research Center, TDK Corporation

• Takeishi Taku

  Materials Research Center, TDK Corporation

Bibliographic Information

Other Title

• 六方晶Ｗ型フェライトＳｒ１－ｘＢａｘ［ＺｎＬｉ０．５Ｆｅ０．５］Ｆｅ１６Ｏ２７の結晶安定性と磁気特性
• 6ポウショウ Wガタ フェライト Sr1-xBax ZnLi0.5Fe0.5

Abstract

Crystal stability and possibility as an anisotropic permanent magnet of W-type hexagonal ferrite with composition of Sr_1-xBax [ZnLi_0.5Fe_0.5]Fe₁₆O₂₇ was investigated. In this study, we found that the amount of Fe²⁺ 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_0.5Fe_0.5]⋅Fe₁₆O₂₇ partially decomposed into M phase and spinel phase. On the other hand, Ba [ZnLi_0.5Fe_0.5]Fe₁₆O₂₇ remained a single phase. It can be assumed that Fe²⁺ substituted for (Li⁺_0.5+Fe³⁺_0.5) or Zn²⁺, and oxidation such as Fe²⁺→Fe³⁺ givies rise to decomposition.<BR>The grain size of Sr [ZnLi_0.5Fe_0.5]Fe₁₆O₂₇ and Ba [ZnLi_0.5Fe_0.5]Fe₁₆O₂₇ 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.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 43 (8), 995-1000, 1996

  Japan Society of Powder and Powder Metallurgy

Keywords

• W-type
• hexagonal ferrite
• Sr<SUB>1-x</SUB>Ba<SUB>x</SUB>[ZnLi<SUB>0.5</SUB>Fe<SUB>0.5</SUB>]Fe<SUB>16</SUB>O<SUB>27</SUB>
• anisotropic permanent magnet
• phase decomposition

Details

• CRID: 1390001206307681408
• NII Article ID: 10002012819
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.43.995
• ISSN: 18809014
• ISSN: 05328799
• NDL BIB ID: 4012523
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4012523
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed