Optical, dielectric and X-ray absorption properties of soda-based glass fabricated from Thai quartz sands doped with iron oxide

摘要

Soda-based glass samples were fabricated in a laboratory scale using quartz sands that was a by-product of feldspar floatation in Tak Province, northern Thailand, and 25-wt% commercial-grade Na_2CO_3 as the main compositions. Fe_2O_3 of 0.1 to 10.0 wt% concentrations was doped into the glass mixture. Well-mixed and dried powders were melted in a ceramic crucible for 6 h at 1250℃ using an electric furnace. Transparent and bubble-free glass samples were obtained as results. It was found that Fe_2O_3 dopant turned the otherwise colorless glass to dark brown. Dielectric property and physical properties, such as, color, specific gravity, and refractive index of the glass samples were studied. The samples' dielectric constant, specific gravity, and refractive index increased with increasing Fe_2O_3 doping concentration. UV-VIS-N1R and synchrotron-based X-ray absorption spectra were measured and discussed.