Oxyfluoride glasses with composition 50GeO₂-(50-x)PbO-xPbF₂ (x = 5, 10 and 15 mol%) containing praseodymium or thulium were melted from commercial raw materials in normal atmosphere. Based on results of differential thermal analysis (DTA), glass transition temperatures and oxide glass crystallisation temperatures have been derived. Then the glass samples were thermally treated in order to achieve controlled precipitation of PbF₂. Process of formation of glass-ceramics has been monitored with the aid of the DTA and X-ray measurements. The control acoustic emission (AE) measurements confirm the DTA results. It has been found that after heat treatment the crystallisation temperatures of investigated materials have been changed due to the PbF₂ content and kind doped ions. The influence of the kind of doped ions on the glass stability was observed. The effect of thermal treatment on the absorption spectra and kinetics of the fluorescent levels of Pr³⁺ and Tm³⁺ was studied. In the case of Tm³⁺ doped systems it was found that this effect on the relaxation of the ¹G₄ level was weak, whereas, the decay of the ³H₄ level was slower by a factor of three roughly with respect to that recorded with as-melted glass. Relaxation rates of the ³P₀ and ¹D₂ levels of Pr³⁺ showed marked dependence on both the PbF₂ and Pr³⁺ content in as-melted glass and in glass-ceramics.


This work was partially supported by Polish Committee for Scientific Research under grant no 7 T08D 020 21.

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