Deciphering the structural origins of high sulfur solubility in vanadium-containing borosilicate glasses
Deciphering the structural origins of high sulfur solubility in vanadium-containing borosilicate glasses
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破译含钒硼硅酸盐玻璃中硫高溶解度的结构起源
DOI:
10.1016/j.jnoncrysol.2023.122554
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发表时间:
2023
影响因子:
3.5
通讯作者:
Goel, Ashutosh
中科院分区:
文献类型:
--
作者:
Saini, Rajan;Neuville, Daniel R.;Youngman, Randall E.;Goel, Ashutosh
The addition of V2O5has been long known to increase the sulfur (as SO42-) solubility in borosilicate glasses. However, the mechanism governing this effect is still unknown. Although several studies have been published in the past two decades attempting to decipher the structural origins of increasing sulfur solubility as a function of V2O5in borosilicate glasses, most of these studies remain inconclusive. The work presented in this paper attempts to answer the question, “Why does V2O5increase sulfur solubility in borosilicate glasses?” Accordingly, a series of melt-quenched glasses in the system [30 Na2O – 5 Al2O3– 15 B2O3–50 SiO2](100-x)–xV2O5, wherexvaries between 0 – 9 mol.%, have been characterized for their short-to-intermediate range structure and the redox chemistry of vanadium using11B,27Al,51V MAS NMR, Raman, and XPS spectroscopy. The impact of V2O5on sulfur solubility in glasses has been followed by ICP-OES. The addition of ≤ 5 mol.% V2O5results in a linear increase in sulfur solubility in the investigated glass system. 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 Si–O–V 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 their voids/open spaces.
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