OST Photonics LiTaO3 Crystal Substrates The chemical formula of lithium tantalate is LiTaO3, lithium tantalate crystal is colorless or yellowish crystal. LiTaO3 crystal is a ferroelectric crystal with excellent electro-optical, piezoelectric, electrical and pyroelectric properties. Use the pulling method to grow. The lithium tantalate crystal is used as a Q-switch in laser technology, as a pyroelectric detector in infrared technology, and can also be used to make filters and resonators.