@article{oai:niigata-u.repo.nii.ac.jp:00004190,
 author = {堀田, 憲康 and 斉藤, 夏風 and 松尾, 重友 and 松下, 徹},
 issue = {11},
 journal = {窯業協會誌, 窯業協會誌},
 month = {Nov},
 note = {Nb_2O_5焼結体と3種類のAl_2O_3-Y_2O_3 系化合物(5Al_2O_3・3Y_2O_3, Al_2O_3・Y_2O_3, Al_2O_3・2Y_2O_3)焼結体を重ね合わせて拡散対とし, 大気中, 1250℃〜1325℃で加熱した.生成する反応層をX線マイクロアナライザー分析及びX線回折により測定し, Nb_2O_5とAl_2O_3-Y_2O_3系化合物との固相反応を調べた. Nb_2O_5のAl_2O_3-Y_2O_3 系化合物への一方拡散により, Al_2O_3・Nb_2O_5及びY_2O_3・Nb_2O_5が生成した.反応層内に生成したAl_2O_3・Nb_2O_5は長球形, Y_2O_3・Nb_2O_5は球形の形状をしており, 各々の粒子は集合体として偏在していた,反応後, 冷却に際してNb_2O_5層と反応層の熱膨脹率の差により, それらの界面ではく離が起こった.反応層の厚化遠度はx^2=2D_<nb>t式に従い, 見掛けの活性化エネルギーは90〜95kcal/molであった., Solid state reactions between sintered Nb_2O_5 and three kinds of Al_2O_3-Y_2O_3 compounds (5 Al_2O_3・3Y_2O_3, Al_2O_3・Y_2O_3, Al_2O_3・2Y_2O_3) have been studied at the temperature range from 1250℃ to 1325℃ in air. The reaction product formed at the interface were examined by using EPMA and X-ray diffraction. The following results were obtained : Al_2O_3・Nb_2O_5 and Y_2O_3・Nb_2O_5 were formed by the one-way diffusion of Nb_2O_5 into the compounds in the system Al_2O_3-Y_2O_3. The ellipsoidal particles of Al_2O_3・Nb_2O_5 and the spherical particles of Y_2O_3・Nb_2O_5 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 Nb_2O_5. The reaction rate "x" followed the parabolic law "x^2=D_<Nb>t", and the apparent activation energy was 90〜95 kcal/mol.},
 pages = {653--658},
 title = {Nb_2O_5 と Al_2O_3-Y_2O_3 系化合物の固相反応},
 volume = {90},
 year = {1982}
}