Comparison of Physical and Optical Properties of Glass Doped with Cobalt Oxide from Chemical and Sugarcane Leaf Ash
DOI:
https://doi.org/10.55674/ias.v14i3.262194Keywords:
Glass, CoO, Sugarcane leaf ash, Physical properties, Optical propertiesAbstract
This research investigates and compares the physical and optical properties of cobalt oxide-doped glass prepared using conventional chemical methods and glass doped with cobalt oxide using sugarcane leaf ash as a source of SiO₂ and CaO. The composition of sugarcane leaf ash was analyzed at various sintering temperatures using X-ray fluorescence (XRF) spectroscopy, revealing a high SiO2 content, with the maximum value reaching 69 wt%. The glass composition was formulated based on the ratio (50–x)SiO₂ (with sugarcane leaf ash used as a partial substitute for SiO2 and CaO): 25B2O3: 10Na2O: 8CaO: 7SrO: xCoO, where x represents the cobalt oxide concentration (0.00, 0.01, 0.02, 0.03, 0.04, and 0.05 mol%). The results showed that both the density and refractive index increased with higher CoO concentrations, while the molar volume decreased. The optical absorption spectra in the wavelength range of 350 – 2000 nm exhibited an increasing trend with rising CoO content. The cobalt oxide-doped glass displayed a blue color, whereas the glass doped with cobalt from sugarcane leaf ash exhibited a reddish-blue hue, as confirmed by CIE Lab* color measurements.
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