Chinese name: Lithium Tantalate

　　English name: Lithium tantalate

　　 English alias: Lithiumtantalatewhitepowder; Lithium tantalate (99.998% Ta) PURATREM; lithium oxido(dioxo)tantalum

　　CAS:12031-66-2

　　EINECS:234-757-5

　　 Molecular formula: LiTaO3

　　 Molecular weight: 235.8871

　　Physical and chemical properties

　　 colorless or light yellow crystals. Trigonal crystal system, distorted perovskite structure, point group C63vR3C. The density is 7.45g/cm3. Mohs hardness is 5.5～6.0. The refractive index nD=2.176. The dielectric constant is 41～53. The primary electro-optical coefficient r12=7.0×10-12m/V, and the electromechanical coupling coefficient R15≥0.3. It is a ferroelectric crystal, the Curie point is (665±5)℃, and the spontaneous polarization intensity is 50×10-6C/cm2. It has excellent electro-optical, piezoelectric, electrical and pyroelectric properties, with a pyroelectric coefficient of 2.3×10-7 C/cm2/K. Use the pulling method to grow. It is used as a Q-switch in laser technology, as a pyroelectric detector in infrared technology, and as a filter and resonator in the electronics industry.