Synthesis of Spinel-Type Magnesium Cobalt Oxide and Its Electrical Conductivity

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This work devotes to investigate synthesis and electrical properties of spinel MgCo<SUB>2</SUB>O<SUB>4</SUB> that is considered as a candidate of the cathode materials of magnesium-ion batteries in future. Samples were synthesized by two types of techniques: solid-state reaction and wet process. The crystal structures of the samples were analyzed by X-ray diffraction, and their electrical conductivities were obtained through the dc resistance and ac impedance measurements. By solid-state reaction, sample of a single MgCo<SUB>2</SUB>O<SUB>4</SUB> phase was not obtained; a sample synthesized at 800°C for 24 h after milling of Co<SUB>3</SUB>O<SUB>4</SUB> and MgO powder was comprised of dual phases of spinel-type and rocksalt-type structures, and samples synthesized at temperatures higher than 880°C showed a single rocksalt-type phase without electrical conductance. The former sample showed p-type semiconducting behavior as well as spinel-type Co<SUB>3</SUB>O<SUB>4</SUB>, but its electrical conductivity around room temperature was shown to exceed that of Co<SUB>3</SUB>O<SUB>4</SUB>. In contrast, a sample consisting of a single spinel-type phase was successfully synthesized by wet process, which exhibited an electrical conductivity of the order 10<SUP>−2</SUP> Scm<SUP>−1</SUP>, being much higher than those of the samples synthesized by solid-state reaction. Thus, substitution of Co<SUP>2+</SUP> in Co<SUB>3</SUB>O<SUB>4</SUB> with Mg<SUP>2+</SUP> is found to enhance the electrical conductivity of the spinel-type phase.

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  • Materials transactions  

    Materials transactions 49(4), 824-828, 2008-04-01 

    The Japan Institute of Metals and Materials

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各種コード

  • NII論文ID(NAID)
    10021145947
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    9447526
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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