Rare earth-dependent trend of the glass transition activation energy of doped phosphate glasses: Calorimetric analysis

Synergistic thermo‐Raman and calorimetric kinetic study of the cation modifier's role in binary metaphosphate glasses

“…The temperature dependence of the P–NBO Raman band positions for the three glasses is compared in Figure . Position of the ω s (PO 2 ) at 80 K is between 1,147 cm −1 and 1,175 cm −1 for the three glasses in agreement with previous reports for similar metaphosphate glasses . The full width at half maximum of the ω s (PO 2 ) at 80 K is as follows: 20 cm −1 (Ba 2+ ); 27 cm −1 (Pb 2+ ); and 28 cm −1 (Ca 2+ ) making it the narrowest line in the Raman spectra.…”

“…Position of the ω s (PO 2 ) at 80 K is between 1,147 cm −1 and 1,175 cm −1 for the three glasses in agreement with previous reports for similar metaphosphate glasses. [19][20][21]23] The full width at half maximum of the ω s (PO 2 ) at 80 K is as follows: 20 cm −1 (Ba 2+ ); 27 cm −1 (Pb 2+ ); and 28 cm −1 (Ca 2+ ) making it the narrowest line in the Raman spectra. The ω s (PO 2 ) band is narrow enough and with strong intensity in a broad temperature interval, suggesting that can be a good structural indicator.…”

“…The set of four constant heating rate heat flow curves were analyzed and the activation energy of the glass transition AE Tg , evaluated, following the established algorithm proposed by us earlier. [23] The set of the heat flow curves obtained for the Pb 2+ glass is presented in Figure 2. The cooling rates after each heating cycle was kept constant at~9 1(3)°C/min.…”

Emission analysis of Tb3+‐and Sm3+‐ion‐doped (Li2O/Na2O/K2O) and (Li2O + Na2O/Li2O + K2O/K2O + Na2O)‐modified borosilicate glasses

“…Recently, an increasing number of studies have focused on the associations between the rare earth ions and their host materials, and how these interactions affect the optical properties of interest for particular applications. In the present work, in order to observe the rare‐earth–host interactions and to determine how to modify the photoluminescence (PL) intensity, borosilicate glasses modified with an alkali oxide (LiO 2 /Na 2 O/K 2 O) and combinations of these alkali oxides were selected and doped with the ions of two rare earth elements: Tb 3+ and Sm 3+ …”

“…In the present work, in order to observe the rare-earth-host interactions and to determine how to modify the photoluminescence (PL) intensity, borosilicate glasses modified with an alkali oxide (LiO 2 / Na 2 O/K 2 O) and combinations of these alkali oxides were selected and doped with the ions of two rare earth elements: Tb 3+ and Sm 3+ . [1,2] With features such as excellent thermal stability, low cost, high doping capacity, and uncomplicated manufacturing processes, glasses Abbreviation used: FT-IR spectroscopy, Fourier transform infrared spectroscopy; PL, photoluminescence; PLE, photoluminescence excitation; Sm, samarium; Tb, terbium; XRD, X-ray diffraction. doped with rare earth ions have become superior to phosphors.…”