Neodymium trioxide (chemical formula: Nd2O3), also known as neodymium oxide (III), is the + 3-valent oxide of neodymium. It is a light blue hygroscopic hexagonal crystal, insoluble in water, soluble in acid, and partially converted to a hypervalent oxide of neodymium when heated in air.

1. Neodymium-doped yttrium aluminum garnet is used in laser technology. It is also used to make neodymium glass. Because of its excellent absorption of ultraviolet and infrared rays, it is used to make precision instruments. It is a raw material for making metal neodymium and various neodymium alloys and permanent magnet alloys. Can be used as glass purple colorant. In the ceramic industry, it is used as an admixture of high temperature porcelain glaze and as an admixture of ceramic capacitors. The aerospace field is used to make alloy materials, adding 1.5% ~ 2.5% neodymium oxide to magnesium or aluminum alloy can improve the high temperature performance, air tightness and corrosion resistance of the alloy. In the medical field, nano-yttrium oxide aluminum garnet lasers doped with nano-neodymium oxide are used instead of scalpels for removing surgical or disinfecting wounds. In addition, nano-yttrium oxide aluminum garnets doped with nano-neodymium oxide produce short-wave laser beams, which are used industrially for welding and cutting thin materials with a thickness of less than 10mm.
2. Neodymium compounds are high purity, mainly used for single crystal growth. Neodymium can compensate for Fe3+(yellow), making the glass colorless and particularly bright.