Previous spectroscopic studies on vanadium
containing glasses [12–16] have shown that the greenish trivalent
vanadium ions exist in distorted octahedral coordination with oxygen's
and exhibit two characteristic absorption bands at 350–400 nm and
580–680 nm and a third possible band in the UV region originating
from the electron transfer within the vanadium ion itself. The tetravalent
bluish vanadium ions are assumed to exist as vanadyl ions
(VO2+) and exhibit characteristic four spin-forbidden weak bands at
420 nm, 760–860 nm, and at around 1000 nm. The pentavalent colorless ̴
vanadium ions corresponding to the d0 configuration and thus will
not give rise to d–d transitions but give a characteristic UV band at
380 nm. The ratio of each valence of vanadium ions in a glass depends
on the type, the composition of glass and the melting condition [10–14].
Recently, Mirzayi and Hekmatshoar [17] studied ZnO–P2O5 glass
containing higher concentrations of V2O5 varying from 5 to 65 mol%.
They observed that the molar volume data were decreased with increasing
V2O5 content. Moreover, structural studies by Fourier transform
infrared (FTIR) spectroscopy were attributed to the modification
process of the phosphate network. Also, Abdelghany and Hammad
[18] investigate the optical and infrared properties of ZnO–P2O5 glasses
doped with WO3 towards gamma irradiation due to the existence of
heavy transition metal oxide in the glass network like WO3. In this
study the optical and infrared absorption spectra of zinc phosphate
glasses containing vanadium pentoxide were examined to justify the
state of vanadium ions in the zinc phosphate glass. It is due to that
Journal of Non-Crystalline Solids 433 (2016) 14–19
⁎ Corresponding author.
E-mail addresses: ahosny2005@gmail.com, ah.hammad@nrc.sci.eg (A.H. Hammad).
http://dx.doi.org/10.1016/j.jnoncrysol.2015.11.016
0022-3093/© 2015 Elsevier B.V. All rights reserved.
Contents lists available at ScienceDirect
Journal of Non-Crystalline Solids
journal homepage: www.elsevier.com/locate/jnoncrysol
these glasses have mixed network former as a result of the high zinc
oxide ratio. Moreover, vanadium oxide have dual properties, i.e. it
can act as a modifier or a former or both (modifier and former).
Hence, this paper is complementary part for the previous researches
concerning on the effect of transition metal oxide in the host ZnO–
P2O5 glasses. The expected outcome of this research is vanadium ions
can act as a modifier with modifying the phosphate glass as semiconducting
materials due to the presence of both zinc and vanadium ions