date:Katholieke Univ Leuven, Vaste Stof Fys Magnetisme Lab, B-3001 Louvain, Belgium; Inst Phys, YU-11080 Belgrade, Yugoslavia; Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany; Moscow State Univ, Dept Phys, Moscow 119899, Russia; Univ Tokyo, Inst Solid State Phys, Minato Ku, Tokyo 106, Japan
The phonon dynamics of LiV2O5 Single crystals is studied using infrared and Raman spectroscopy techniques. The infrared-active phonon frequencies and dielectric constants are obtained by oscillator fitting procedure of the reflectivity data measured at room temperature. The Raman-scattering spectra are measured at room temperature and at T = 10 K in all nonequivalent polarized configurations. The assignment of the phonons is done by comparing the infrared and Raman spectra of LiV2O5 and NaV2O5. The factor-group analysis of the LiV2O5 crystal symmetry and of its constituent layers is performed to explain the symmetry properties of the observed modes. Ne concluded that layer symmetry dominates in the vibrational properties of this compound.