Synthesis of, Cobaltferrite-Dispersed Carbons by Pressure Pyrolysis of Organometallic Copolymers

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Other Title
  • 有機金属化合物共重合体の加圧熱分解によるコバルトフェライト分散炭素の合成
  • ユウキ キンゾク カゴウブツ キョウジュウゴウタイ ノ カアツ ネツ ブンカイ
  • Special Articles on Technology and Its Characterization for Synthesis of Inorganic Materials. Synthesis of Cobaltferrite-Dispersed Carbons by Pressure Pyrolysis of Organometallic Copolymers.

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Abstract

Carbon powders dispersed uniformly with cobaltferrite particles were successfully synthesized by pressure pyrolysis of vinylferrocene-cobaltocene derivative-divinylbenzene in the Presence of water below 650 °C at 125 MPa with their high yield and control of morphology of resultant carbon. The amount of cobaltferrite decreased markedly in the carbon matrix formed at 700 °C, since cobaltferrite was reduced to cobalt oxide and wustite by excess carbon. The size of carbon particles was about O.5 μm in diameter at 600 °C and 2.0 μm at 700 °C. The morphology of carbon was dependent upon the pyrolysis temperature and the concentration of metal in a starting copolymer. The morphology of carbon changed from coalescing polyhedra to spherulites with increasing pyrolysis temperature from 600 °C to 700 °C. The size of metal oxide particles which were finely dispersed in carbon synthesized at 600 °C was about 30 nm, which increased with pyrolysis temperature. The saturation magnetization and the coercive force of cobaltferrite-dispersed carbon prepared at 600 °C and 125 MPa were 4.8 emu/g and 2 k0e, respectively.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1991 (10), 1261-1265, 1991-10-10

    The Chemical Society of Japan

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