Studies on Preparation of Acicular Ferrites and Their Properties.

• Hiratsuka Nobuyuki

  Dept. of Functional Materials Science, Fac. Eng., Saitama University

Bibliographic Information

Other Title

• 磁性材料の化学　　針状性フェライトの合成と特性に関する研究
• シンジョウセイ フェライト ノ ゴウセイ ト トクセイ ニカンスルケンキュウ

Abstract

Acicular barium ferrite, cobalt ferrite and crystal oriented manganese zinc ferrite particles were prepared using the acicular α-FeOOH as the starting material. The crystal structure and magnetic characteristics of these fine particles were investigated in detail. Acicular barium ferrite fine particles doped with Co²⁺ ions and Ti⁴⁺ ions were fabricated by a conventional sintering method. The BaCo_xTixFe_12-2xO₁₉ particles consisted of some grains and their c-axis were aligned along the short axis of the acicular particles. The output waveform of the acicular barium ferrite magnetic tape signified that it had perpendicular magnetic anisotropy. Acicular cobalt ferrite fine particles were prepared from acicular α-FeOOH and C₁₀H₁₄O₄Co⋅2H₂O. The particles had coercivity of 1 kOe (80kA/m) and magnetization values of 67 emu/g (0.45Wb/m²). The output of the magnetic tape made of the acicular particles, with long axis of 0.4μm was greatlly enhanced in the high density recording. The acicular Mn-Zn ferrite fine particles composed of 65.6mol. %Fe, 21.9mol. %Mn and 12.5mol. %Zn were made by conventional sintering method. The fine particle was made up of several crystallites with long axis of 0.2-1.0μm. These fine particles were pressed in an applied magnetic field and then sintered at 1250°C for 4hrs in air. The oriented Mn-Zn ferrite exhibited strong crystal orientation similar to the single crystal of it.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 45 (1), 43-52, 1998

  Japan Society of Powder and Powder Metallurgy

Keywords

• acicular particle
• barium ferrite
• cobalt ferrite
• Mn-Zn ferrite
• magnetic recording tape
• perpendicular magnetic recording

Details

• CRID: 1390282681285877248
• NII Article ID: 20000363511
• NII Article ID: 10002014901
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.45.43
• COI: 1:CAS:528:DyaK1cXhtFOhsb4%3D
• ISSN: 18809014
• ISSN: 05328799
• ISSN: http://id.crossref.org/issn/05328799
• NDL BIB ID: 4392663
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4392663
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed