Article,
The role of TiO2 in the B2O3-Na2O-PbO-Al2O3 glass system
JOURNAL OF SOLID STATE CHEMISTRY, 184 (11): 3062-3065 (2011)
DOI: 10.1016/j.jssc.2011.09.011
Abstract
Optical and vibrational studies have been carried out on 6B(2)O(3)
center dot (20 - x)Na2O center dot 10PbO center dot 10Al(2)O(3):xTiO(2) (x=0, 1, 2, 3, 4, and 5 mol%) glasses, in order to understand the role
of TiO2 in the 60B(2)O(3) center dot 20Na(2)O . 10PbO - 10Al(2)O(3)
glass matrix. The X-ray patterns reveal homogeneous glasses over the
entire compositional range. The absorption spectra show that the energy
of the optical band gap (Delta E-opt) and Urbach's energy (E-U)
decreases as TiO2 content increases. The changes observed in the Raman
and IR spectra are related to the BO4 -> BO3 back conversion effect and
the appearance of ``loose'' BO4- groups. The data indicate that
titanium ions act as a network modifier. (C) 2011 Elsevier Inc. All
rights reserved.
