@article{oai:niigata-u.repo.nii.ac.jp:00004192,
 author = {堀田, 憲康 and 松下, 泰彦 and 松尾, 重友},
 issue = {1},
 journal = {窯業協會誌, 窯業協會誌},
 month = {Jan},
 note = {相対密度の異なる2種のY_2O_3晶焼結体(70%，95%)とNb_2O_5焼結体とを重ね合わせて，2種の拡散対とし，1275〜1350℃で加熱してY_2O_3‐Nb_2O_5系固相反応を調べた.その境界面に生成する反応層を電子顕微鏡観察，X線マイクロアナライザー分析，X線回折及び熱膨張率測定することにより次のような結果を得た.Y_2O_3層とNb_2O_5層の境界面においてY_2O_3・Nb_2O_5なる反応層が生成する.これはY_2O_3中へのNb_2O_5Oの一方拡散に起因するものである.この拡散反応の活性化エネルギーは70%Y_2O_3で150kcal/mol，95%Y_2O_5で200kcal/molとなった.また1350℃では反応層中に50〜55mol%範囲での濃度勾配が認められた.反応属とNb_2O_5層は，はく離したが，これは熱膨張率の差によることが判明した., Solid state reactions between sintered Y_ 2O_3 and Nb_2O_5 have been studied from 1275℃ to 1350℃, in which two kinds of sintered Y_2O_3, 70 and 95% dense, were employed. Techniques used were electron microscopy, EPMA., X-ray diffraction and dilatometry. A layer of Y_2O_3・Nb_2O_5 formed at the Y_2O_3-Nb_2O_5 interface, of which growth was controlled by the one-way diffusion of Nb_2O_5 across the product layer. The apparent activation energies of the diffusion for 70% and 95% dense Y_2O_3 are 150 and 200 kcal/mol, respectively. EPMA of 1350℃-specimen showed the concentration gradient of Nb across the reaction layer ranging from 50 to 55 mol% of Nb_2O_5 increasing towards the Y_2O_3・Nb_2O_5-Nb_2O_5 interface. The observed separation of diffusion couples is probably due to the difference of thermal expansion coefficients between the product and Nb_2O_5.},
 pages = {1--5},
 title = {Y_2O_3Nb_2O_5系の固相反応},
 volume = {86},
 year = {1978}
}