単結晶Al_2O_3におけるMgOの囲溶度

概要

論文の詳細を見る
A new diffusion-couple method was developed to determine the solubility of MgO in Al2O3. The solubility was determined by electron probe microanalysis. The solubilities determined in air using a diffusion-couple of a single crystal and a large grain-sized polycrystal are approximately 55 and 95 wt ppm at 1973 and 2073K, respectively, much smaller than those previously determined by Roy and Coble. The cause of the large difference is attributed to the difference in the physical states of the samples. While single crystals and large grain-sized polycrystals were used in this work, powder was used in the previous work. When 400wt ppm MgO-doped polycrystalline Al2O3 was annealed in air for 2.5d at 2073K, second phase particles of spinel precipitated at grain boundaries, especially at triple grain boundaries.
社団法人日本セラミックス協会の論文
1987-04-01