Abstract
Ultra-transparent glass-ceramics are synthesized in the GeO 2–PbO–PbF 2 system by rare-earth heterogeneous nucleation of PbF 2. The influence of YbF 3 on the nucleation process is studied through differential thermal analysis (DTA) and the morphology is observed by transmission electron microscopy (TEM). The optical properties of the glass-ceramics are compared to those of the starting glass as well as to those of a PbF 2 single crystal. Thanks to the RE segregation inside the PbF 2 crystallites, the optical characteristics of the glass-ceramics are found to be equivalent to those of the single crystal. The synthesis of rare-earth doped CaF 2 nano-powders, as precursors for transparent ceramics, by direct precipitation, microemulsion and mechanosynthesis is described. The different obtained powders are characterized by X-ray diffraction (XRD) and TEM and their respective morphology and purity are compared. For the powder obtained by microemulsion, the effect of annealing at various temperatures is investigated showing an increase of the particles sizes and an enhancement of the optical properties.
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