Annealing effect on copper-doped sodo-borate glasses (na2o-4b2o3)

Abstract

The annealing effect of an alkalino-borate type glass below the softening temperature was investigated accord ing to the Na2O-B2O3 binary system. Doping of the samples was done by the introduction of copper oxide "CuO" according to different levels. The properties of elaborate glasses before and after annealing have been studied. DRX diffraction, optical spectroscopy and infrared analysis were used to complete this study. The obtained results show that the annealing heat treatment affects the structure of these glasses by redistributing the structural units, partially correcting the defects and reinforcing them of the structure. It has been noticed that the BO3 units are reformed again and the BO4 have decreased, which has led to an increase in the coefficient of thermal expansion, a decrease in the diffraction index and optical dispersion, a drop in mechanical prop erties, thermal conductivity and electrical permittivity.