2. Pyrooptical element, oxygen-sensitive element, high-capacity capacitor, optical storage, image display element, light modulated element, light shutter, stereotelevision glasses, image storage and display element.
3.Abrasive material, insulating material, fire-retarding material, roentgenograply.
4.High-temperature and corrosion resisting components, bearing nozzle, smelting crucible.
5.Piezoelectric element, ion exchanger, solid dielectric, filter, temperature and pressure transmitters and transmitting elements, electrode used for magnetic-current generator, heating element.
6.Jewellery: artificial jewel.