Solid State Reaction between Nb<sub>2</sub>O<sub>5</sub> and the Compounds in the System Al<sub>2</sub>O<sub>3</sub>-Y<sub>2</sub>O<sub>3</sub>

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  • HOTTA Noriyasu
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • SAITO Natsukaze
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • MATSUO Shigetomo
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • MATSUSHITA Toru
    Department of Applied Chemistry, Faculty of Engineering, Hokkaido University

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Other Title
  • Ｎｂ２Ｏ５とＡｌ２Ｏ３‐Ｙ２Ｏ３系化合物の固相反応
  • Nb2O5 ト Al2O3 Y2O3ケイ カゴウブツ ノ コソウ ハンノウ

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Solid state reactions between sintered Nb2O5 and three kinds of Al2O3-Y2O3 compounds (5Al2O3⋅3Y2O3, Al2O3⋅Y2O3, Al2O3⋅2Y2O3) have been studied at the temperature range from 1250°C to 1325°C in air. The reaction product formed at the interface were examined by using EPMA and X-ray diffraction. The following results were obtained:<br>Al2O3⋅Nb2O5 and Y2O3⋅Nb2O5 were formed by the one-way diffusion of Nb2O5 into the compounds in the system Al2O3-Y2O3. The ellipsoidal particles of Al2O3⋅Nb2O5 and the spherical particles of Y2O3⋅Nb2O5 were unevenly distributed with the aggregation state in the reaction layers. The observed separation of reaction couples was probably due to the difference of thermal expansion coefficients between the reaction products and Nb2O5. The reaction rate “x” followed the parabolic law “x2=2DNbt”, and the apparent activation energy was 90-95kcal/mol.

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