Used in the synthesis of catalysts for petroleum refining and polymerization reactions, enhancing efficiency and selectivity. Employed in the production of specialty glasses and optical materials due to its ability to modify refractive index and improve durability. Applied in biomedical research as a tracer or labeling agent in cellular studies. Utilized in water treatment processes to remove phosphate ions, helping control eutrophication in wastewater. Also serves as a precursor in the preparation of lanthanum oxide and other lanthanum-based functional materials for electronics and ceramics.