CoO・Al_2O_3スピネルの合成に関する研究
スポンサーリンク
概要
- 論文の詳細を見る
Cobalt-aluminum spinel (CoO⋅Al2O3) was synthesized by sintering the equimolar mixture of Co(OH)2 and γ-Al2O3 in at temperature range from 1000 to 1500°C under different atmosphere. When heating the sample in air, the grain size of the spinel was 0.07μ at 1000°C, 11μ at 1500°C. The color of the products was changed from light to violet blue with raising temperature which results larger grain size. Under O2 atmosphere, a defect spinels (CoO)1-x⋅Al2O3 were formed below 1200°C, and the stoichiometric spinel above 1200°C. Lattice constants of the spinels synthesized below 1200°C under O2 atmosphere were smaller than those of the samples synthesized at the corresponding temperature in air.In air, the solid solutions between CoO⋅Al2O3 and Al2O3 were formed above 1200°C. The amount of dissolved Al2O3 in spinel increases with increasing temperature.
- 1976-09-01