Potassium niobate

Potassium niobate (KNbO₃) is a perovskite ferroelectric crystal. It has nonlinear optical coefficient properties, making it common in the manufacture of lasers. Nanowires of potassium niobate have been used to produce tunable coherent light. The LD₅₀ for potassium niobate is 3000 mg/kg (oral, rat).