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Mechanism of surface colouration in tellurite glass during press forming

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The mechanism of surface colouration in tellurite glass (75TeO2.20ZnO.5Na2O) during press forming has been investigated at 350°C under an N2 atmosphere. The degree of surface colouration varied depending on the contacted mould materials, Ti, W, Si, Si3N4 and SiO2. According to x-ray photoelectron spectroscopy (XPS) results, the increase of absorbance at 405 nm after press forming correlated well with the basicity of the mould surface as well as the amount of the reduced tellurite near the glass surface. Furthermore, x-ray fluorescence (XRF), showed that the diffusion of Si from the mould of Si-based materials into the glass increased with the increase of basicity, in the order of SiO23N4
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Document Type: Research Article

Publication date: August 1, 2009

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