Glasses have many technological applications due to their elec-
trical and optical properties. B2O3 is established as glass forming
oxide whereas Bi2O3 and V2O5 are conditional glass formers.
Vanadium doped glasses are known to exhibit semiconducting
properties. Growing attention has been given in the last two
decades to glasses containing Bi2O3 owing to their optical proper-
ties [1–6]. The properties of bismuth glasses were studied by many
authors to explain its role in glass structure [7–10]. Borate glasses
containing Bi2O3 posses a high refractive index, show large polariz-
ability, and high optical basicity [11]. These glasses have potential
applications in the field of glass ceramics, layers for optical and
electronic devices, thermal and mechanical sensors, reflecting win-
dows and superconducting materials [12]. The Bi3+ ion has small
field strength so Bi2O3 cannot form glass by itself [13]. However, in
the presence of B2O3 glass formation is possible. The large glass for-
mation region in bismuth borate glasses has been attributed to the
high polarizability of the Bi3+ cations. This property of Bi3+ ions also
makes the glass suitable as non-linear optical/photonic material
with high non-linear optical susceptibility [14].
Mixed alkali glasses are unique from the point of view that
certain properties change much more than normally anticipated
from what appears to be a structurally and compositionally simple
substitution of one alkali oxide for another. Mixed alkali effect in