尿素法によるイットリア前駆体の水熱合成 Hydrothermal Synthesis of Yttria Precursor by the Urea Method

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著者

    • 松下 直哉 MATSUSHITA Naoya
    • 東北大学大学院 工学研究科地球工学 Department of Geoscience and Technology, Graduate School of Engineering, Tohoku University
    • 中塚 勝人 NAKATSUKA Katsuto
    • 東北大学 工学研究科地球工学 Department of Geoscience and Technology, Graduate School of Engineering, Tohoku University

抄録

Fine particles of monodispersed yttria are desirable for preparing transparent and/or high-performance, -functional ceramics. Various shape of yttria precursors was observed in the precipitates synthesized through homogeneous precipitation from aqueous solution by reacting with each other of thermal decomposition products of urea at 115 °C. Three types precipitates of particle morphologies such as hallow spheres with rough and smooth suefaces, and rodlike shape were synthesized in an aqueous solution containing urea with sulfate ion. All of them crystallized to monophase yttria above 1,100 °C. The calcined particles were hollow basketlike, porous-spherical and rodlike with rough surface. The basketlike hollow spheres were obtained from solution of low [urea]/[yttrium ions] ratio in a short reaction time, and rodlike ones were obtained from solution of high [urea]/[yttrium ions] ratio in a long reaction time. Spherical, rodlike and platelet precipitates were synthesized in an aqueous solution of urea coexisting with nitrate ions, and a monophase of yttria was obtained above 800 °C. These facts indicate that the shape of yttria precursor obtained in the solution coexisting with sulfate or nitrate ions were controlled by the [urea]/[yttrium ions] ratio and reaction time.

収録刊行物

  • 資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan  

    資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan 115(3), 177-184, 1999-03-25 

    The Mining and Materials Processing Institute of Japan

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各種コード

  • NII論文ID(NAID)
    10002469306
  • NII書誌ID(NCID)
    AN10062646
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09161740
  • NDL 記事登録ID
    4786629
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-315
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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