چكيده به لاتين
In this study, the impact of additive that are sensitive to the ultraviolet radiation at producing the selective, opalized sites in opal Fluoride glass was investigated. The light-sensitive additives were SnO2, CeO2, AgCl that the P2O5 played the Opacity role. In addition to the combination, the effect of heat treatment temperature on opalization and glass colors outcomes were studied. From the eight different combinations, four of them were selected as optimum specimen and radiation of the ultraviolet light operation, with wavelength of 340nm for 90 minutes was done. Additionally, crystalized metal type, microstructure and optical absorption spectra of glasses have been analyzed by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Diffuse Reflection Spectroscopy (DRS) methods, respectively. The results showed that the crystal phases of Ag3PO4 and NaF in samples with different intensities have been crystalized, and were added to intensity by increasing of heat treatment temperature. SEM figures illustrated the liquid-liquid phase segregation at specimens before to the crystallization process. Moreover, the color altering in specimens were investigated by DRS method which by increasing amount of AgCl additive from 0.015% wt to 0.15 %wt, the color of glass changes from colorless to amethyst that the key factor was formation of Silver colloids and also Ag3PO4 crystallization in samples. Finally, the sample that was consist of 3.5 %wt F, 0.07 %wt AgCl and 1 %wt P2O5 additives were chosen as an optimum combination in terms of color and light-sensitivity in both radiated and non-radiated specimen. Plus, the temperature of 550 ℃ with time of 30 minutes have been chosen as optimum heat treatment parameters. The research outcomes proved that the mentioned combinations for Opalness in radiated preferential regions are not impressive, on the other hand, radiation attributed to the color altering in specimens.
