Yttrium oxide (Y2O3) is a white rare earth oxide, insoluble in water and alkali, but soluble in acid. It is a rare C-type central earth oxide with a body-centered cubic structure. Yttrium oxide is often used as a functional additive due to its high dielectric constant, good heat resistance, strong wear resistance and a series of other excellent physical properties. It is widely used in the fields of atomic energy, aerospace, fluorescence, electronics, high-tech ceramics, etc. As a fluorescent powder matrix material, it is used in the fields of display, lighting and marking; as a laser medium material, it is made into transparent ceramics with high optical performance, which can be used as a laser processing medium to achieve laser power at room temperature.