Solid State Reaction between Nb<sub>2</sub>O<sub>5</sub> and CaO

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  • HOTTA Noriyasu
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • HASEGAWA Minoru
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • MAEDA Hiroyuki
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • MATSUO Shigetomo
    Department of Chemical Engineering, Faculty of Engineering, Niigata University

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Other Title
  • Nb<sub>2</sub>O<sub>5</sub>-CaO系の固相反応
  • Nb2O5 CaOケイ ノ コソウ ハンノウ

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Abstract

Solid state reactions between sintered Nb2O5 and CaO have been studied in Ar at the temperature range from 1150°C; to 1300°C. The reaction layers formed at the Nb2O5-CaO interface were examined by using electron microscopy, EPMA, X-ray diffraction and dilatometry. The following results were obtained.<br>At 1150°C and 1200°C, three layers (CaO⋅Nb2O5, 2CaO⋅Nb2O5 and a phase mixture of cubic 3CaO⋅Nb2O5 and orthorhombic compound) and at 1250°C and 1300°C, four layers (CaO⋅Nb2O5, 2CaO⋅Nb2O5 cubic 3CaO⋅Nb2O5 and a phase mixture of cubic 3CaO⋅Nb2O5 and orthorhombic compound) were formed. These results indicated that the one-way diffusion of CaO into Nb2O5 occurred. The order in width of the reaction layer was the phase mixture, cubic 3CaO⋅Nb2O5, 2CaO⋅Nb2O5 and CaO⋅Nb2O5. The orthorhombic compound was richer in CaO content than 4CaO⋅Nb2O5. No compound richer in CaO content than orthorhombic compound was found in the temperature range 1150°C to 1300°C.

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