板状α-Fe_2O_3粒子のテトラエチレングリコール中加熱によるスピネル型酸化鉄粒子の合成と特性評価  [in Japanese] Characterization of Spinel-Structured Iron Oxide Particles Synthesized by Heating α-Fe_2O_3 Platelets in Tetra-Ethylene Glycol  [in Japanese]

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Author(s)

    • 浅井 佳 ASAI Kei
    • 筑波大学数理物質科学研究科物性・分子工学専攻 Department of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba
    • 長崎 幸夫 NAGASAKI Yukio
    • 筑波大学数理物質科学研究科物性・分子工学専攻 Department of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba
    • 喜多 英治 KITA Eiji
    • 筑波大学数理物質科学研究科電子・物理工学専攻 Institute of Applied Physics, University of Tsukuba

Abstract

  Platelet particles of α-Fe<sub>2</sub>O<sub>3</sub> 30-50 nm in size were heated in tetra-ethylene glycol to obtain spinel-structured iron oxide particles, which were confirmed by X-ray diffraction. With heating, 100 nm platelets were formed, and the proportion of the 100 nm platelets increased in comparison to 30-50 nm platelets with increasing duration of heating. In all the samples, irrespective of the heating time used during synthesis, the coercive force, which was considered to be dependent on the shape anisotropy of the platelet particles, remained nearly constant at 12.7-13.5 kA/m (160-170 Oe). The saturation magnetization initially increased and then decreased with the heating time and the maximum value observed was 80.5 Am<sup>2</sup>/kg (80.5 emu/g). The reduction and oxidation were considered to occur simultaneously during the synthesis.<br>

Journal

  • Journal of the Japan Institute of Metals and Materials

    Journal of the Japan Institute of Metals and Materials 77(8), 307-310, 2013-08-01

    The Japan Institute of Metals and Materials

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Codes

  • NII Article ID (NAID)
    10031189527
  • NII NACSIS-CAT ID (NCID)
    AN00062446
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    00214876
  • NDL Article ID
    024820755
  • NDL Call No.
    Z17-314
  • Data Source
    CJP  NDL  J-STAGE 
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