Lanthanum hexaboride is widely used as a high-performance electron emitter in electron microscopes and other electron beam instruments due to its low work function and high electron emissivity. It is also employed in plasma generation systems and as a cathode material in high-power electronic devices. Additionally, it finds applications in thermionic energy converters and in the production of advanced materials for semiconductor manufacturing. Its stability at high temperatures and in harsh environments makes it suitable for use in aerospace and defense technologies.