Nb2O5-CaO系の固相反応

堀田 憲康, 長谷川 実, 前田 博之, 松尾 重友

doi:10.2109/jcersj1950.89.9

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. 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.

Nb<sub>2</sub>O<sub>5</sub>-CaO系の固相反応

書誌事項

この論文をさがす

抄録

収録刊行物

キーワード

詳細情報詳細情報について

書き出し

問題の指摘