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Thermal and Structural Characterization of Transparent Rare-Earth Doped Lead Fluoride Glass-Ceramics

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DOI: 10.4236/njgc.2012.22010    4,120 Downloads   8,057 Views   Citations


The devitrification of glasses with composition 50GeO2-40PbO-10PbF2-xREF3, RE = Gd, Eu, 0 < x ≤ 2, leads to glass ceramics made of RE3+: β-PbF2 nanocrystals embedded in a glassy oxide matrix. This transformation is investigated using thermal analysis, X-ray diffraction and electron microscopy. A comparison with RE3+: β-PbF2 ceramics prepared by standard ceramic techniques is performed. The Rare Earth cations show a strong nucleating effect for the precipitation of the RE3++: β-PbF2 nanocrystals. The evolution of the unit cell parameters of the REF3: β-PbF2 solid solution results from a combined effect of Pb2+-RE3+ substitution and interstitial F– introduction. In the glass ceramics, RE3+: β-PbF2 nanocrystals are constrained by the glassy matrix when they form with a pressure equivalent to 1.6 GPa. The constrained nanocrystals can return to a relaxed state by chemical dissolution of the embedding glassy matrix, followed by thermal treatments.

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C. Bensalem, M. Mortier, D. Vivien, P. Gredin, G. Patriarche and M. Diaf, "Thermal and Structural Characterization of Transparent Rare-Earth Doped Lead Fluoride Glass-Ceramics," New Journal of Glass and Ceramics, Vol. 2 No. 2, 2012, pp. 65-74. doi: 10.4236/njgc.2012.22010.


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