期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2016
卷号：5
期号：2
页码：1734
DOI：10.15680/IJIRSET.2015.0502103
出版社：S&S Publications
摘要：Influence of rare earth oxide on structure and glass properties has been investigated in lead bismuthalumina borate (LBAB) glasses doped with Tm2O3 and Yb2O3. From the optical absorption spectra it was observed thatcut-off wavelength shifts towards the lower wavelength side with the addition of rare earth ions. The absorptionspectra exhibited no bands for pure glass and the bands at 658 nm (3H6 → 3F2), 686 nm (3H6 → 3F3), 792 nm (3H6 →3H4), 1211 nm (3H6 → 3H5) and 1663 nm (3H6 → 3F4) due to Tm3+ ions and a band at 977 nm (2F7/2 → 2F5/2) is due toYb3+ ions. Optical absorption spectra show that the absorption edge has a tail extending towards lower energies. Theedge shifts towards higher energies for all rare earths-doped glasses. The degree of the edge shift was found to bedepending on the ionic radius of the rare earths and is mostly related to the structural rearrangement and the relativeconcentrations of the glass basic units. By increasing the ionic radius of the rare earths, the optical energy gapdecreases, while the width of the localized states is increased. Optical band gap (Eopt) and Urbach energy (ΔE) valueswere calculated from the spectra. The FTIR spectra reveals that the glass has BO4, BO3, AlO4 and Bi2O3 units as thelocal structure.
关键词：X-Ray diffraction; Optical absorption; FTIR; Lead borate glasses.
