The Study of Electron Beam Irradiation on Eu2O3 Doped Pbf2 - Teo2 - B2O3 Glasses
Abstract
We report here the combined structural, optical and
thermal studies carried out for the prepared Eu2O3 doped PbF2-
TeO2-B2O3 glass [built using melting molding technique] samples
before and after being subjected to electron beam of energy 7.5
MeV [Dose: 150 kGy], containing 0-2.5 mol% of Eu2O3. The
increase in densities of the samples both before and after
irradiation has been understood, mainly due to the UV-VIS-NIR
data, energy band gap (Eg) values and the characteristic
temperatures obtained from Differential Scanning Calorimetry
(DSC) study. The decrement in the values of energy band gap
and the shifting of the absorption cut-off wavelength of UV-VISNIR
spectra towards red edge, proved the formation of color
centers in the glass network after irradiation. The changes in the
physical appearance of the glasses from light yellow to deep
yellowish color after irradiation were studied through color
measurement. The change in Hunter L values after irradiation,
through color measurement was a proof for the color centers or
absorption centers created in the glass sites. Glass transformation
temperatures [glass transition (Tg), onset of crystallization (Tx),
crystallization (Tc) and melting temperature (Tm)] through
Differential Scanning Calorimetry (DSC), were analyzed to study
the thermal effects on amorphized borate glasses and check its
reaction on stability and vitreous network of the glass samples
both before and after electron beam irradiation.
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