Formation of La<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB>-Al<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB> Solid Solution and Phase Transition of Alumina Formed by Thermal Decomposition

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  • DAIMON Keiji
    Department of Materials Science and Engineering, Nagoya Institute of Technology; Gokiso-cho, Showa-ku, Nagoya-shi 466-8555 Japan
  • TOMIMATSU Hiroki
    Department of Materials Science and Engineering, Nagoya Institute of Technology; Gokiso-cho, Showa-ku, Nagoya-shi 466-8555 Japan
  • HIKICHI Yasuo
    Department of Materials Science and Engineering, Nagoya Institute of Technology; Gokiso-cho, Showa-ku, Nagoya-shi 466-8555 Japan
  • OTA Toshitaka
    Ceramics Research Laboratory, Nagoya Institute of Technology; 10-6-29, Asahigaoka, Tajimi-shi 507-0071 Japan

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Other Title
  • La<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB>-Al<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB>系固溶体の生成と加熱分解生成アルミナの相転移
  • Formation of La2 (SO4)3-Al2 (SO4)3 Solid Solution and Phase Transition of Alumina Formed by Thermal Decomposition.

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Solid solutions of La2(SO4)3 and Al2(SO4)3 were prepared by rapidly drying mixed aqueous solutions using micro-wave heating. The La3+ion is soluble into the anhydrous aluminum sulfate crystal lattice up to about 6mol%. On heating the thermal decomposition starts at 830°C for the pure Al2(SO4)3, while at 760°C for 6mol% La2(SO4)3 contained Al2(SO4)3. The anhydrous aluminum sulfate solid solution thermally decomposes into the η-Al2O3 without any other crystalline phases. The LaAl11O18 is formed after heating the desulfurized product at 1300°C without forming LaAlO3 when the content of La2O3 is less than 6mol%.The La3+ doping increases the stability of η-Al2O3 at high temperatures. The phase transformation of alumina takes place above 1350°C when the amount of La2O3 is 5mol%.

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