Raman spectra of sodalimesilicate glass doped with rare earth

摘要

Sodalimesilicate glasses doped with different rare earth oxides (La _2O_3, CeO_2, Nd_2O_3, Gd _2O_3 and Y_2O_3) of 1 mol% content were prepared by the traditional meltingquenching methods. In order to reveal the effects of rare earth elements on the behavior of sodalimesilicate glass the structures of sodalimesilicate glasses doped with different rare earth oxides were determined using an INVIA confocal microRaman spectrometer equipped with a CCD detector, and viscosities of glass melts were measured using a rotating crucible viscometer; the melting temperature of the studied glasses was derived on the basis of the Arrhenius equation. Three expressions of the fraction of non-bridging oxygen (NBO/NBOBO), average number of non-bridging oxygen (NBO) per tetrahedron (NBO/tetrahedron) and average number of bridging corners per tetrahedron (bridges/tetrahedron) for investigated sodalimesilicate glasses were given, and the effect of rare earth dopants on the structure of sodalimesilicate was characterized by the Raman shift, variation of the [SiO_4] tetrahedron structural unit Q~n (n=1,2,3,4), fraction of non-bridging oxygen and the average number of bridging corners per tetrahedron. The effect of doping rare earth oxides into glass on the viscosity and melting temperature was interpreted by changes in structure of sodalimesilicate glasses doped with rare earth oxides.