Spectroscopic approach to chlorine local environment in aluminoborosilicate glasses

• Published in: Materials letters Vol. 378; p. 137618
• Main Authors: Lefebvre, Guillaume, Trcera, Nicolas, Paris, Michael, Morizet, Yann
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2025; Elsevier
• Subjects: Chemical Sciences; Chlorine incorporation mechanisms; High-pressure; Nuclear waste glass; Chlorine incorporation mechanisms; Nuclear waste glass; High-pressure
• ISSN: 0167-577X
• DOI: 10.1016/j.matlet.2024.137618

•Combined XAS and XPS can investigate the chlorine local environment in glasses.•Chlorine has multiple dissolution mechanisms in glasses.•Chlorine can replace oxygen from tetrahedral units in high-pressure glasses.
Chlorine local environment has been investigated using spectroscopic approach (XAS and XPS) for Na- and Ca-bearing aluminoborosilicate glasses synthesised at 1.0 GPa. Based on Cl K-edge EXAFS results, Cl appears to show two local environments in glasses: one at long distance ∼2.7 Å assigned to Cl- species charge compensated by Na+ and/or Ca2+ and one at short distance ∼1.8 Å assigned to Cl-Cl and Si-Cl species. The Cl 2p XPS results cannot unambiguously confirm the presence of Si-Cl overlapped with Na+/Ca2+…Cl- species.