Optical Characterization of the Ordered Vacancy Compound CuGa3Se5

The lattice vibrational modes of the Ordered Vacancy Compound CuGa3Se5 have been obtained at 300 K by a combined analysis of infrared reflectivity and Raman spectra. Lines common to both spectra, observed at 48, 64, 105, 142, 187, 200, 218, 250, and 274 cm-1, were identified with E or B2 modes. The most intense peak at 166 cm-1 and those observed at 72 and 90 cm-1, which are only Raman active, are assigned to the AI and BI modes, respectively.