Study of Physical and Optical Properties of Cobalt Oxide Doped Glass Prepared by Microwave Melting Technique

Abstract

This research investigates the physical and optical properties of cobalt oxide-doped glass prepared using the microwave melting technique. The glass composition was formulated according to the ratio (50-x)B₂O₃ : 10SiO₂ : 30ZnO : 10Na₂O : xCoO, where x represents the cobalt oxide concentration (0.00, 0.01, 0.05, 0.10, 0.15, and 0.20 mol%). Glass samples were prepared using the microwave melting technique, applying 1,000 watts of power for 20 minutes. The melted glass was then poured into a graphite mold and annealed at 500°C. The results showed that both density and refractive index increased with rising CoO concentration, while molar volume decreased. The absorption spectra of the glass, in the wavelength range of 250-1,100 nm, increased with higher CoO concentrations. Additionally, the CIE L*a*b* values indicated a blue color.