Solid State Reaction between Y<sub>2</sub>O<sub>3</sub> and Nb<sub>2</sub>O<sub>5</sub>

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  • Y<sub>2</sub>O<sub>3</sub>-Nb<sub>2</sub>O<sub>5</sub>系の固相反応
  • Y2O3 Nb2O5ケイ ノ コソウ ハンノウ

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Abstract

Solid state reactions between sintered Y2O3 and Nb2O5 have been studied from 1275°C to 1350°C, in which two kinds of sintered Y2O3, 70 and 95% dense, were employed. Techniques used were electron microscopy, EPMA, X-ray diffraction and dilatometry.<br>A layer of Y2O3⋅Nb2O5 formed at the Y2O3-Nb2O5 interface, of which growth was controlled by the one-way diffusion of Nb2O5 across the product layer. The apparent activation energies of the diffusion for 70% and 95% dense Y2O3 are 150 and 200kcal/mol, respectively.<br>EPMA of 1350°C-specimen showed the concentration gradient of Nb across the reaction layer ranging from 50 to 55mol% of Nb2O5 increasing towards the Y2O3⋅Nb2O5-Nb2O5 interface. The observed separation of diffusion couples is probably due to the difference of thermal expansion coefficients between the product and Nb2O5.

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