Abstract
Transparent oxyfluoride glasses andβ-PbF2 nanocrystals containing glass-ceramics were prepared with varyingEu3+ content (0.3, 0.4, 0.5 and 0.6%). The effect ofEu3+ content on the preparation of glass-ceramics was investigated. From differential scanning calorimetry,the Tx–Tg (Tx—temperature of the onset of crystallization;Tg—glasstransition temperature) parameter for glasses has shown slight variation, and an exothermic peak nearTg called the ceramizationtemperature (Tc) has been observed. Heat treatments were performed at thistemperature to obtain transparent glass-ceramics containingβ-PbF2 nanocrystals, identified by x-ray diffraction. Heat treatments for different periods of time wereperformed and were observed to be very important in the control of the crystal size and of thecrystallization rate. Based upon the absorption spectra, the scattering level due to the presence ofβ-PbF2 nanocrystals in the glass-ceramics was observed to be similar to that for the mother glasses.Detailed analysis of emission spectra and decay time measurements led to the identification ofEu3+ ionsas the β-PbF2 crystalline phase. Excitation spectra at 70 K show the interaction ofEu3+ ions with the fluorogermanate network.
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