Abstract
The aim of the research is to manufacture the colourless high iron Na2O–CaO–SiO2 glass with natural local raw materials with high iron content. Chemical and physical decolorizer like CeO2 and Nd2O3 were used in oxidation conditions by maintaining the redox of the melt. The maximum transmittance of colourless glass obtained at 546–562 nm is 91 % with a thickness of 6.5 mm. The addition of polyvalent ions Nd2O3/CeO2 decreases the optical band gap (Eg) and Urbach energy (ΔE) which results in resistance against solarization. Additionally, it also decreases the structural disorder results in high young & shear modulus. Lack of O–H in glass facilitates to retain more Si–O–Si in the glass matrices which enhances the down conversion luminance intensity of Nd3+ from 4I9/2 to 4F5/2 and improves the Far-IR behavior of the glass. Chromaticity diagram revealed that the doped glass has CI value 5416K which is closes to white light emission 5500k. Due to the presences of the Nd2O3/CeO2 and antimony oxide the Refractive index (ng), density (ρ), molar volume (V) and molecular weight of the glass increases. Maintaining the redox of the glass melt and Fe2+/Fe3+ ratio with the chemical and physical decolorizer will help to decolourize the Na2O–CaO–SiO2 glasses with the Fe2O3 content up to 0.3 % with the same methodology.
Published Version
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