Effects of Metal Ion Addition on the Crystalline Phase of Zirconium Dioxide Studied by X-Ray Diffraction Spectrometry

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  • TERAMACHI Aoi
    Department of Regional Sciences, Graduate School of Integrated Arts and Sciences, The University of Tokushima
  • YAMASHITA Kazuhide
    Department of Mathematical and Material Sciences, Faculty of Integrated Arts and Sciences, The University of Tokushima
  • YAMAMOTO Takashi
    Department of Regional Sciences, Graduate School of Integrated Arts and Sciences, The University of Tokushima Department of Mathematical and Material Sciences, Faculty of Integrated Arts and Sciences, The University of Tokushima Institute of Scio-Arts and Sciences, The University of Tokushima

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Other Title
  • X線回折法によるジルコニア結晶化過程に対する金属イオン添加効果の検討
  • Xセン カイセツホウ ニ ヨル ジルコニア ケッショウカ カテイ ニ タイスル キンゾク イオン テンカ コウカ ノ ケントウ

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<p>Twelve kinds of metal-ion added zirconium oxide catalyst materials were prepared by impregnation of 10 mol% metal salt (Ca, V, Cr, Fe, Ni, Cu, Zn, Mo, W, Y and Ce) or sulfate ion onto amorphous zirconium hydroxide followed by calcination at 673-1273 K. Crystallization process of zirconium oxide, fraction of the tetragonal phase and d-spacing of the tetragonal (101) reflection were investigated by XRD as a function of calcination temperature. The addition of metal ion stabilized meta-stable tetragonal and/or cubic phase, and suppressed phase transition to thermodynamically stable monoclinic phase. The added elements were classified into four groups by degree of stabilization. In cases for Fe, Ni, Cu and Zn-ion added zirconium oxides, the meta-stable phase could exist at the calcination temperature till 873 K. The d (101) spacing for corresponding to tetragonal ZrO2 phase in the four samples calcined at 773 K were smaller than that for non modified ZrO2, and ion radii of the added elements were close to that of Zr4+.</p>

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