Used primarily in the production of scandium metal, which is employed in high-strength aluminum-scandium alloys for aerospace and defense applications. These alloys offer improved strength, weldability, and thermal stability, making them ideal for aircraft, spacecraft, and lightweight military components. Also utilized in solid oxide fuel cells as a dopant in electrolyte materials to enhance ionic conductivity at lower temperatures. Finds application in specialty optical coatings and fluoride glass systems due to its low refractive index and high resistance to thermal shock. Additionally, used in research settings for catalyst development and in nuclear technology as a neutron filter or moderator component.