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Transparent fluorotellurite glasses were prepared by melt-quenching in the ternary system TeO 2 -Nb 2 O 5 -PbF 2 . The synthesis conditions were adjusted to minimize fluorine loss monitored as HF release. It was found that 10 mol% of Nb 2 O 5  is the optimum content for PbF 2  incorporation up to 35 mol% in the tellurite matrix without loss of glass forming ability. Such glass compositions exhibit a wide optical window from 380 nm to about 6 μm. Crystallization properties were carefully investigated by thermal analysis and compositions with higher PbF 2  contents exhibit preferential precipitation of lead oxyfluoride Pb 2 OF 2  at lower temperatures. The lead oxyfluoride crystallization mechanism is also governed by a volume nucleation, barely reported in tellurite glasses. Eu 3+  doping of these glass compositions also promotes a more efficient nucleation step under suitable heat-treatments, resulting in transparent Eu 3+ -doped glass-ceramics whereas undoped glass-ceramics are translucent. Finally, Eu 3+  spectroscopy pointed out a progressive, more symmetric surrounding around the rare earth ions with increasing PbF 2  contents as well as higher quantum efficiencies. These new fluorotellurite glass compositions are promising as luminescent hosts working in the middle infrared.

Transparent Glasses and Glass-Ceramics in the Ternary System TeO2-Nb2O5-PbF2