1. As a catalyst: Rare earth oxides have good catalytic activity and selectivity, and can be used as a catalyst for chemical reactions, such as automobile exhaust catalytic converters.
2. As material additives: Rare earth oxides can improve the physical and chemical properties of materials, and can improve the processing properties of materials, such as rare earth oxides can be used as additives for ceramics, glass, metal alloys and other materials.
3. As fluorescent materials and magnetic materials: some rare earth oxides are fluorescent and magnetic, and can be used in phosphors, laser materials, magnetic materials and other fields.