Used in the production of optical glasses and ceramics due to its ability to enhance refractive index and thermal stability. Acts as a catalyst in various organic reactions, including sulfonation and polymerization processes. Employed in water treatment to remove phosphates and other contaminants, improving water quality. Utilized in the manufacturing of phosphors for fluorescent lamps and cathode ray tubes, contributing to efficient light emission. Applied in research and development for studying lanthanum-based compounds and their properties in material science.