Brillouin scattering spectra of rare earth doped glasses have been measured to investigate the differences of optical properties of soda magnesia alumina silicate glasses with different Eu3+ and Pr3+ concentrations. Measurements of Brillouin frequency shifts and intensities along with refractive indexes and densities allow us to calculate the acoustic sound velocities, elastic and photoelastic constants. The physical significance of the changes in elastic and photoelastic constants as a function of rare earth content and type is discussed. The results on elastic constants show that the glasses become harder with increasing concentration of the high coordinated rare earth modifiers. From Carleton's model, the Lorentz-Lorenz effect dominates P12, while the atomic effect dominates P44 in our glasses. The increase in both the bond polarisability parameter and Poisson's ratio with the rare earth concentration indicates the enhancement in polarisability and ionicity of these glasses.
|Number of pages||7|
|Journal||Physics and Chemistry of Glasses|
|Publication status||Published - Apr 2002|
ASJC Scopus subject areas
- Ceramics and Composites
- Physical and Theoretical Chemistry