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Abstract: Influence of rare earth ions on structural behavior in lead borate glasses has been investigated using infrared spectroscopy. The structural changes have been analyzed with increasing rare earth concentration. Partial BO3↔BO4 conversion as a function of rare earth concentration is observed only for the smaller heavier lanthanides, whereas for the larger lighter lanthanides the concentration effect has not been found. [Copyright &y& Elsevier]

Abstract: Dysprosium-doped heavy metal glasses and transparent glass–ceramics have been investigated using optical spectroscopy. Visible luminescence due to 4F9/2–6H J /2 (J =11, 13, 15) transitions of Dy3+ was registered. Based on excitation and emission spectra as well as luminescence decay analysis, some spectroscopic parameters for Dy3+ ions in glass samples before and after annealing were determined. Especially, the yellow-to-blue luminescence intensity ratios Y/B corresponding to the 4F9/2–6H15/2 and 4F9/2–6H13/2 transitions of Dy3+ ions were analyzed as a function of glass host composition and thermal treatment. [Copyright &y& Elsevier]