Thermal, structural and optical properties of tungsten-fluorophosphate glasses and glass-ceramics with high lead fluoride contents

Abstract

Eu³⁺-doped lead fluorophosphate glass samples were prepared in the ternary system (40-x)NaPO₃-xWO₃-60PbF₂ by the melt-quenching method. The influence of the NaPO₃/WO₃ ratio on the thermal and structural properties as well as on the ability of these compositions to crystallize as glass-ceramics containing lead fluoride phase β-PbF₂ was investigated. Thermal properties and characteristic temperatures were determined by DSC and used to define suitable heat-treatment temperatures for selective crystallization. The corresponding crystalline phases and average crystallite sizes were determined by X-ray diffraction. Structural changes versus composition were also studied by Raman spectroscopy. UV-visible absorption spectra were used to determine the bandgap energies versus composition. Specific compositions exhibiting β-PbF₂ crystallization were selected and Eu³⁺ emission spectra were used to check the Eu³⁺ environment and crystallization state as a function of heat-treatment conditions and glass composition. The results suggest that progressive β-PbF₂ crystallization promotes a higher symmetry and lower phonon energy environment of Eu³⁺ resulting in longer excited state lifetimes only for WO₃ richer compositions.