Chen, T-Y and Rautiyal, P and Vaishnav, S and Gupta, G and Schlegl, H and Dawson, R J and Evans, A W and Kamali, S and Johnson, J A and Johnson, C E and Bingham, P A (2020) Composition-structure-property effects of antimony in soda-lime-silica glasses. Journal of Non-Crystalline Solids, 544. Art No-120184. ISSN 0022-3093

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Float glass-type SiO2-Na2O-CaO glasses with 0 - 10 mol% Sb2O3 were melted and their compositional, structural, thermal and optical properties characterised. All glasses were X-ray amorphous and increasing Sb2O3 content progressively decreased glass transition temperature (T-g) and dilatometric softening point (T-d), despite increases in Al2O3 content from greater crucible corrosion. Sb-121 Mossbauer spectroscopy confirmed that Sb was predominantly incorporated as Sb3+ (Sb3+/Sigma Sb similar to 0.9) and Raman spectroscopy showed that Sb substantially decreased average (Si, Al)-O Q(n) speciation. Both techniques confirmed that Sb3+ ions were incorporated in trigonal pyramidal :SbO3] polyhedra. XRF and Raman spectroscopies confirmed that SO3 content decreased with increasing Sb2O3 content. TGA analysis showed, as a linear function of Sb2O3 content, mass gain commencing at 700 degrees C, reaching a maximum at 1175 degrees C, then mass loss above 1175 degrees C, consistent with oxidation (Sb3+ -> Sb5+) then reduction (Sb5+ -> Sb3+). The TGA samples were shown to have attained or approached Sb redox equilibrium during measurement. Optical absorption spectroscopy (UV-Vis-nIR) showed red-shifts of the UV absorption edge with increasing Sb2O3 content, consistent with increasing intensity of far-UV absorption bands from Sb3+ and Sb5+ s -> p transitions. UV-Vis-nIR fluorescence spectroscopy evidenced a broad luminescence band centred at similar to 25,000 cm(-1), attributed to the P-3(1)-> S-1(0) transition of Sb3+, which is Stokes shifted by similar to 15,000 cm(-1) from the S-1(0)-> P-3(1) absorption at similar to 40,000 cm(-1). The most intense emission occurred at 0.5 mol% Sb2O3, with concentration quenching reducing luminescence intensities at higher Sb2O3 contents. Additions of Sb2O3 to float-type soda-lime-silica glasses could thus enable lower melting energies and/or new solar energy applications.

Item Type: Article
Subjects: Glass
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 25 Jan 2021 10:56
Last Modified: 25 Jan 2021 10:56

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