Insight into the structure and chemical durability of Cr-bearing lead crystal glass
The scientific understanding and demonstration of the immobilization of heavy metals (notably lead and chromium) in food contact materials is crucial for the safety of the environment and humans. To tackle this issue lead crystal glasses doped between 50 and 2000 ppm of Cr2O3 were altered under severe aqueous alteration conditions (acetic acid 4%, pH 2.4, 70 °C, 330 days). The increase in Cr leads to a decrease in the Pb release into the solution. The leached Cr content was lower than Pb, itself much lower than alkalis. Structural characterization before and after alteration shows the presence of Cr(III) exclusively, with no redox changes in the course of alteration. Cr and Pb are partially retained during alteration near cationic domains, which are less accessible to protonated species. Cr favors the Si recondensation in the rich non-bridging oxygen (NBO) mixing sites, leading to an increase of glass polymerization within the altered layer.
Authors
- R. Losno (ORCID: https://orcid.org/0000-0003-0246-862X)
- Laurent Cormier (ORCID: https://orcid.org/0000-0002-3554-0707)
- Thibault Charpentier (ORCID: https://orcid.org/0000-0002-3034-1389)
- Stéṕhane Gin (ORCID: https://orcid.org/0000-0002-1950-9195)
- Daniel R. Neuville (ORCID: https://orcid.org/0000-0002-8487-5001)
- Frédéric Angeli (ORCID: https://orcid.org/0000-0001-5632-7684)
- Mariona Tarragó (ORCID: https://orcid.org/0000-0002-0325-6955)
- Marine Cotte (ORCID: https://orcid.org/0000-0002-4949-588X)
- Eric D. van Hullebusch (ORCID: https://orcid.org/0000-0002-1519-1925)
- Léa Brunswic (ORCID: https://orcid.org/0000-0002-5072-9620)
- Léa Gardie
Institutions
- Centre National de la Recherche Scientifique (FR)
- Institut de physique du globe de Paris (FR)
- Université de Montpellier (FR)
- Université Paris Cité (FR)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- European Synchrotron Radiation Facility (FR)
- Sorbonne Université (FR)
- Laboratoire d’Archéologie Moléculaire et Structurale (FR)
- CEA Paris-Saclay (FR)
- CEA Marcoule (FR)
- Institut de minéralogie, de physique des matériaux et de cosmochimie (FR)
- Institut de Recherche pour le Développement (FR)
- Institut des Sciences et technologies pour une Economie Circulaire des énergies bas carbone (FR)
Publication Details
- Journal
- npj Materials Degradation
- Published
- 2025-05-02
- DOI
- https://doi.org/10.1038/s41529-025-00586-7
- Primary Topic
- Glass properties and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Agence Nationale de la Recherche
- European Synchrotron Radiation Facility