Barium titanate

Barium titanate (BTO) is an inorganic compound with chemical formula BaTiO₃. It is the barium salt of metatitanic acid. Barium titanate appears white as a powder and is transparent when prepared as large crystals. It is a ferroelectric, pyroelectric, and piezoelectricceramic material that exhibits the photorefractive effect. It is used in capacitors, electromechanicaltransducers and nonlinear optics.