Synthesis of Needle-like Nickel Powder by Thermal Decomposition of Nickel Oxalate

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  • OKAMOTO Takeshi
    Department of Material Science and Engineering, Nagoya University
  • ICHINO Ryoichi
    Department of Material Science and Engineering, Nagoya University
  • OKIDO Masazumi
    Department of Material Science and Engineering, Nagoya University
  • LIU Zhihong
    College of Metallurgical Science and Engineering, Central South University
  • ZHANG Chuanfu
    College of Metallurgical Science and Engineering, Central South University

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Other Title
  • シュウ酸塩熱分解プロセスによる針状ニッケル粉の合成
  • シュウ サンエン ネツ ブンカイ プロセス ニ ヨル シンジョウ ニッケルコ ノ ゴウセイ

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Abstract

Needle-like nickel powder with high aspect ratio was synthesized by the thermal decomposition of the precursors consisting of nickel ammine oxalate precipitated from aqueous solution. Nickel precursors of c.a. 1 μm in length and 50 nm in width were obtained by falling two solutions in drops simultaneously into distilled water at pH 9.5. One is a solution containing nickel chloride hexahydrate and ammonia, and the other is a sodium oxalate solution. The morphology of particles changed from granular to needle-like with the increase in pH. Large and size-dispersed needle-like particles were obtained at 363 K. The shape of metallic nickel particles changed from needle-like at 613 K to chain-like at 673 K depending on the heating treatment temperature of nickel precursors.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 121 (6), 255-259, 2005

    The Mining and Materials Processing Institute of Japan

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