Used as a precursor in the synthesis of lanthanum-containing materials for optical coatings and phosphors in lighting and display technologies. Employed in catalysts for organic reactions, including polymerization and hydrogenation processes. Applied in water treatment to reduce phosphate levels by forming insoluble lanthanum phosphate. Utilized in research for developing solid oxide fuel cells and other advanced ceramic materials. Also investigated for use in medical applications, such as phosphate binders in dialysis treatments for kidney disease patients.