About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
|
Symposium
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Glasses and Optical Materials: Current Issues and Functional Applications
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Presentation Title |
Deciphering the Structural Origins of High Sulfur Solubility in Vanadium-containing Borosilicate Glasses |
Author(s) |
Rajan Saini, Ashutosh Goel, Daniel R. Neuville, Randall E. Randall E. Youngman |
On-Site Speaker (Planned) |
Rajan Saini |
Abstract Scope |
The addition of V2O5 has been long known to increase the sulfur (as SO42-) solubility in borosilicate glasses. Although several studies have been published to decipher the structural origins of increasing sulfur solubility as a function of V2O5 in borosilicate glasses, most of these studies remain inconclusive. To answer this question, a series of glasses [30Na2O-5Al2O3-15B2O3-50SiO2](100-x) – x V2O5, (x = 0 – 9 mol.%) have been characterized using 11B, 27Al, 51V MAS NMR, Raman, and XPS spectroscopy. The impact of V2O5 on sulfur solubility in glasses has been followed by the ICP-OES. Based on the results, we hypothesize that adding vanadium to the glasses increases their network connectivity, but reduces the network rigidity by replacing stronger Si–O–Si linkages with weaker SiO4–VO4 linkages and forming (VO3)n-single chains. These modifications to the glass structure increase the flexibility of the network, thus making it possible to accommodate SO42- in its voids. |