Results
Optical absorption spectrum of base binary bismuth silicate glass
Fig. 1 illustrates the UV–visible absorption spectra of binary bismuth
silicate glass of the composition (mol%) Bi2O3 70%, SiO2 30%
before and after gamma irradiation.
The optical spectrum of this glass before irradiation exhibits
both strong UV and near visible absorption extending from 200
to about 600 nm and showing six peaks at about 230. 320, 380,
400 430 and 500 nm. The intensities of the near visible peaks is
higher than that of UV peaks. On gamma irradiation, the UV
absorption remains unchanged and a new induced band is observed
at about 530 nm and the rest of the visible spectrum reveals
lower intensity.
Optical absorption spectra of 3d transition metal ions-doped bismuth
silicate glasses
Fig. 2 illustrates the optical spectra of TMs (0.2%)-doped samples
before and after gamma irradiation and the experimental optical
results can be summarized as follows:
Titanium-doped glass
This TiO2-doped glass reveals an extended UV–visible absorption
very close to the spectrum of the undoped sample. Also, the
Fig. 1. UV–visible absorption spectra of binary bismuth silicate glass of the
composition (mol%) Bi2O3 70, SiO2 30% before and after gamma irradiation