Infrared and Raman spectra ofLiV2O5single crystals

Abstract

The phonon dynamics of LiV 2 O 5 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 LiV 2 O 5 and NaV 2 O 5 . The factor-group-analysis of the LiV 2 O 5 crystal symmetry and of its constituent layers is performed to explain the symmetry properties of the observed modes. We concluded that layer symmetry dominates in the vibrational properties of this compound.

Spectroscopic and Computational Study of Structural Changes in γ-LiV2O5 Cathodic Material Induced by Lithium Intercalation

“…34 shows that all spectral peaks present in the spectrum of powder exist in the spectra of single crystal.…”

“…Furthermore, some of the single crystal spectra in Ref. 34 were measured at the temperature of 10 K and therefore, the peaks width in these spectra is essentially smaller than in the powder spectra recorded at the room temperature. …”

Charge ordering and optical transitions ofLiV2O5andKonstantinović1, Dong2, Ziaei3 et al. 2001Phys. Rev. BSelf Cite121130View full textAdd to dashboardCite

“…In LiV 2 O 5 the effects caused by the uniform vanadium valence are not observed [18], and the structure is assumed to be in a charge-ordered phase (without a spin gap) even at room temperature [19]. We have measured and compared the optical spectra of LiV 2 O 5 and NaV 2 O 5 .…”

Magnetodielectric effect in theS=1∕2quasi-two-dimensional antiferromagnetK2V3Rai1, Cao2, Musfeldt3 et al. 2006Phys. Rev. B240380View full textAdd to dashboardCite

“…Several modes show softening and splitting at low temperature, evidence of the 110 K structural distortion and a soft lattice. Based on vibrational properties studies in similar vanadyl oxide compounds, 67,68,69,70,71 the features of interest below 500 cm −1 can be assigned as V-O-V bending, O-V-O bending, and other low-energy tortional and twisting motions of the square pyramidal and tetrahedral building block units. The behavior of the 6.8 meV (55 cm −1 ) cluster (Fig.…”