Abstract
Glasses of the following composition 45Na 2 O·(55 ― x)P 2 O 5 ·xNb 2 O 5 and 50Na 2 O·(50 ― x)P 2 O 5 ·xNb 2 O 5 are studied. It is found that under the influence of γ-radiation the glass color changes. Optical absorption spectra, photoluminescence spectra, Rayleigh and Mandel'shtam - Brillouin scattering (RMBS) spectra are investigated in dependence of glass composition, europium concentration, thermal treatment duration and radiation dose. Effect of secondary thermal treatment is studied on the base of 45Na 2 O·25P 2 O 5 ·30Nb 2 O 5 doped with 1 mol.% Eu 2 O 3 . It is found that intensity of photoluminescence gives rise and decay time as well under thermal treatment at the temperature exceeding transition temperature by 50 degrees. RMBS spectra of glasses after thermal treatment demonstrate decrease of scattering intensity while Eu 2 0 3 being doped. Effects obtained are accounted for europium ion local symmetry changes.
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