SrTiO3 crystal, with the chemical formula SrTiO3, is an oxide of strontium and titanium. It belongs to the cubic crystal system and has excellent physical and chemical properties. SrTiO3 single crystal has good lattice matching with various perovskite structure materials, so it is widely used in many fields. For example, it is a high-quality substrate material for high-temperature superconducting films and various oxide films, and is also used for special optical windows and high-quality sputtering targets.