| 摘要 |
PURPOSE:To obtain high preservability of manget, by forming an alpha-Fe2O3-structured layer on the surface of a needle gamma-Fe2O3-structured layer. CONSTITUTION:gamma-Fe2O3 is obtained by oxidizing needle Fe2O3 in the air. A structural defect within the gamma-Fe2O3 powder decreases preservability. When the needle gamma-Fe2O3 powder of low preservability is annealed under neutral atmosphere at 200-450 deg.C, an alpha-Fe2O3-structured layer is united on the surface of gamma- Fe2O3-structured layer. This enables the high preservability. |
