Spontaneous Raman spectra of the crystalline, molten and vitreous rare-earth oxyorthosilicates

The polarized Raman spectra of Lu2SiO5 (LSO) and Gd2SiO5 (GSO) have been measured. The symmetries of the vibrational modes in the LSO and GSO Raman spectra were determined with using the group-theory calculations. Evaporation of SiO2 from the LSO crystal at annealing above 2100 K and from the LSO melt was determined with High Temperature Raman Spectroscopy technique. It was found, that invert glasses with the LSO and GSO compositions could be synthesized by quick quenching their melts. The structure of these glasses was studied by means of the Raman spectroscopy data.

► The polarized Raman spectra of Lu2SiO5 and Gd2SiO5 crystals were studied at 300 K.
► The 24Ag + 18Bg vibrations for Lu2SiO5 and 24Ag + 16Bg for Gd2SiO5 were registered.
► An evaporation of SiO2 from the Lu2SiO5 melt was determined with HTRS technique.
► Invert glasses with the Lu2SiO5 and Gd2SiO5 compositions were synthesized.