IR spectra of tellurium germanate glasses and their structure

Abstract

Changes in the coordination of boron and germanium ions occur when the PbO and GeO 2 contents in the glasses increase. The glasses are attractive for designing optical and laser devices.

Vibrational, EPR and optical spectroscopy of the Cu2+ doped glasses with (90–x)TeO2–10GeO2–xWO3 (7.5 ≤ x ≤ 30) composition

“…The band observed at 630 cm −1 in 82.5TeO 2 -10GeO 2 -7.5WO 3 (TWG1) glass is assigned to TeO 4 tbp units and the band at 660 cm −1 in TWG1 is assigned to TeO 3 tp units. The band at around 780-790 cm −1 is due to Te-O eq bond vibrations of distorted TeO 4 units [17,18]. The absorption bands in the 505-520 cm −1 region and 730 cm −1 region in all glasses are typical for a six-coordinate germanium ion i.e., [GeO 6 ] units [17].…”

“…The band at around 780-790 cm −1 is due to Te-O eq bond vibrations of distorted TeO 4 units [17,18]. The absorption bands in the 505-520 cm −1 region and 730 cm −1 region in all glasses are typical for a six-coordinate germanium ion i.e., [GeO 6 ] units [17]. The shoulder at 855-862 cm −1 is assigned to vibration of W-O-W linkages [18,19].…”

Infrared Spectroscopic Characterization of Tellurite Glasses Containing Heavy Metal Oxides

“…[14,30]. Analyzing the obtained results and -668 1022 1333 3448 BTZP2 -668 1081 1344 3448 BTZP3 458 687 1085 1342 3448 BTZP4 458 667 1022 1342 3450 comparing them to the published data [12], it is clear that trigonal pyramids [TeO 3 ] are present in the structure of all the glass systems (BTZP) because the absorption band appears at 667-685 cm −1 region. For lower concentration of PbO (20 mol%), PbO substituted for ZnO in BTZP series causes changes in the structure of the glasses, which is apparent in a shift of the absorption band at 668 cm −1 to higher wave number side up to 687 cm −1 .…”

“…PbO could act both as glass network former and as modifier depending on its concentration in the glasses [11,12]. B 2 O 3 is one of the best and well-known glass former.…”

Yb^3+, Tm^3+ and Ho^3+ triply-doped tellurite core-cladding optical fiber for white light generation

“…Glasses containing heavy oxides such as TeO 2 , GeO 2 , Bi 2 O 3 and PbO are promising materials for near infrared (IR) technologies, non-linear optics and design of new laser devices [1]. Tellurite glasses have been intensively investigated because of their structural and optical properties, including low phonon energy (~750 cm −1 ) [2], extended infrared transmittance (from 0.4 µm to about 6 µm), high non-linear and linear refractive indices and high rare earth ions (RE) solubility.…”