| 摘要 |
PURPOSE:To obtain the titled desired single crystal ferrite in high yield by using the hematite formed by roasting magnetite at a temp. lower than before as the raw material of polycrystal ferrite when single crystal ferrite is produced by a solid-phase reaction. CONSTITUTION:The seed of single crystal ferrite is bonded to the end face of polycrystal ferrite, the material is heated, and polycrystal ferrite is grown into single crystal ferrite to produce single crystal ferrite. In this case, the hematite to be used as the raw material of polycrystal ferrite is roasted at a temp. 300-600 deg.C lower than the conventional roasting temp. The hematite having a high content of gamma-Fe2O3, namely a high magnetic temp., is thus obtained. |
