Effect of replacing B2O3 with Dy2O3 on the structural, physical, and radiation shielding properties of sodium boroaluminate glass

In this work, some transparent aluminum sodium borate-based glasses containing Dy2O3
have been prepared using the melt
quenching method. The incorporation of Dy3+
ions in the glass network leads to increase and decrease the density and molar
volume, respectively. The structural properties are investigated by XRD and FTIR spectroscopy. It is revealed that addition
of Dy2O3
causes a conversion of boron coordination from BO4
to BO3,
which indicates the increase in the number of nonbridging
oxygen. Therefore, the optical band gap is found to decrease as the Dy3+
ions content increases. The temperature
dependences of dielectric constant and AC conductivity are studied at different frequencies. The electric conductivity and
dielectric parameters decrease with increasing Dy3+
content due to the decrease in Na+
ions mobility due to the blocking
effect of Dy3+
cations in the glass network. The shielding factors have been evaluated for the prepared glasses with the help
of Phy-X program. The maximum linear attenuation coefficient (LAC) is found at 0.284 MeV and varied between 0.125 and
0.140 cm−
1. The results revealed that the incorporation of Dy2O3
into the glasses has a substantial effect on the Zeff.. The
value of the Zeff for the D1 sample, which does not include any Dy2O3,
stays relatively the same, ranging around 7.51. We
found that the rate of reduction in Zeff was significantly high when the energy of the photons is smaller than 0.826 MeV. From
the Zeff data, we found that the addition of Dy2O3
to the glasses improves both their capacity to absorb and their capability
to scatter ionizing radiation.