Redox Effects of Erbium Oxide Doped Industrial Soda-Lime Glasses by UV-VIS-NIR Study

Abstract:

Redox states of soda lime glass melts have been widely studied by using variations of oxidizing and colorizing agents. In physical decolorizing process, the clear white glassware can be obtained by controlling the suitable amount and type of both oxidizing and colorizing agents in the batch formula. Erbium oxide (Er₂O₃) is interested in this study since it provides beautiful pink color and enhances optical properties of the glass. The aim of present work is to decolorized glasses by adjusting the redox number and using Er₂O₃ as a doping agent. The industrial soda-lime glasses were melted at 1450 °C for 3 hours and quenched in the air. Sodium sulfate (Na₂SO₄), Sodium nitrate (NaNO₃), Antimony trioxide (Sb₂O₃) and carbon were used as the oxidizing agents. The redox states were calculated and adjusted by using the Simpson’s redox number concept. The oxide compositions of the glass samples were measured by XRF. The color of glass samples was examined by using UV-VIS spectrophotometer. The results show that by doping Er₂O₃ in glasses, the brightness of glasses is improved, and the glass color is located in the white zone of the color space diagram. The optimum glasses should have the ratio of Fe²⁺/Fe_total less than 0.10, and the redox number should not exceed 15. By using various kinds of oxidizing agent, the glass has more clear white color than using Na₂SO₄ alone.

• Periodical: Key Engineering Materials (Volume 702)
• Pages: 121-124
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.702.121
• Online since: July 2016
• Authors: Jakrapong Kumsap*, Anurat Poowancum, Anucha Wannagon
• Keywords: Erbium Oxide, Lab Color Space, Physical Decolorization, Redox State

References

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DOI: 10.4028/www.scientific.net/amr.39-40.541