Bismuth phosphate is an inorganic bismuth salt of phosphoric acid, typically represented by the formula BiPO₄. It appears as a white, crystalline to amorphous powder and is characterized by its high chemical and thermal stability. The compound is insoluble in water and most organic solvents, but dissolves in strong mineral acids. Due to its stability and low solubility, bismuth phosphate is widely used in ceramics, catalysts, nuclear chemistry (as an ion-exchange/precipitation material), and materials research.