SPECTROSCOPIC PROPERTIES OFB₂O₃–PbO–Nd₂O₃GLASSES

Abstract

Samples belonging to xNd 2 O 3 (100 − x)[2B 2 O 3 · PbO] glass system, with 0 ≤ x ≤ 40 mol%, are investigated by IR and UV-VIS spectroscopies in order to obtain evidence for the influence of Nd 2 O 3 on the local order from 2B 2 O 3 · PbO glass matrix. Besides the IR absorption bands characteristic to lead and boron arrangements, typical absorption lines of Nd 3+ ions around 4000 cm −1 and 6000 cm −1 are recorded. The 6000 cm −1 band appears only for the samples with x ≥ 25 mol% Nd 2 O 3 . The split of some UV-VIS absorption bands arising from transitions of neodymium ions in doublet lines as well as the shift of the absorption bands as the Nd 2 O 3 content increases denote the influence of the lead-borate matrix on the radiative transitions of the lanthanide ion.

Effect of lead oxide on optical properties of Dy3+ ions in PbO–H3BO3–TiO2–AlF3 glasses

“…The trend of the Dy\O covalency obtained from the Y/B intensity ratios is same as that of the covalency observed from Ω 2 parameter. When PbO is added to borate glass, the BO 3 units are converted into BO 4 units leading to the close packing of oxygen atoms around the RE ion resulting in a higher symmetry around the RE ion site [18,20]. There is a back conversion of BO 4 to BO 3 for higher PbO content with the formation of non-bridging oxygen atoms [19].…”

Concentration dependent structural, optical and thermal investigations of Dy3+-doped sodium fluoroborate glasses

“…Previous literature [1,12,13] reveals that the multicomponent borate glasses consist of relatively large structural units like boroxyl rings, penta-, tri-, di-and meta-borate groups with bridging or non-bridging oxygen ions. The FTIR bands in the range 1420-1170, 1050-900 and 760-490 cm À 1 are assigned as BO 3 stretching vibrations, BO 4 stretching vibrations and B-O-B bending vibrations, respectively [14,15]. The broad bands are due to the combinations of high degeneracy of vibrational states, thermal broadening of the lattice dispersion and mechanical scattering of powdered samples.…”