Abstract
Polarization-dependent far-infrared reflectivity measurements were carried out on single crystals of anatase . The results were analyzed to yield the dielectric dispersion properties of anatase in the lattice fundamentals regime. The frequencies (in ) of the transverse optical (TO) and longitudinal optical (LO) zone-center phonons were determined to be 367(755) for the TO (LO) of the mode, 262(366) and 435(876) for the modes. The large TO-LO splittings were used to estimate effective charges.
DOI:https://doi.org/10.1103/PhysRevB.55.7014
©1997 American Physical Society