Raman Scattering in Non-Stoichiometric Lithium Niobate Crystals with a Low Photorefractive Effect
Raman spectra of lithium niobate single crystals strongly doped by read more zinc and magnesium, it has been established, contain low-intense bands with frequencies 209, 230, 298, 694, and 880 cm−1.Ab ignition calculations fail to attribute these bands to fundamental vibrations of A2 symmetry type unambiguously.Such vibrations are prohibited