Raman scattering in α-In2Se3 crystals

A directional freezing method was used to obtain In2Se3 crystals. Rietveld refinement of the diffraction data was performed. The Raman spectra of the α-phase of In2Se3 were measured with polarized light in different configurations of the crystals. Phonon modes were assigned to the Raman tensors of the R3m space group. LO-TO splitting of the A modes were determined.