Unmixing inducing polymerization of a sodium-molybdenum borosilicate network

Pereira, Luiz ; Schuller, Sophie ; Donatini, Adrien ; Wadsworth, Fabian B. ; Neuville, Daniel R.; Dingwell, Donald B. und Ligny, Dominique De (15. Februar 2025): Unmixing inducing polymerization of a sodium-molybdenum borosilicate network. In: Materials Letters, Bd. 381, 137776

Abstract

Glass network polymerization critically influences rheological behavior and with it the kinetics and dynamics of nuclear waste immobilization. Molybdenum-bearing borosilicate melts may undergo unmixing and rheological changes, which is dominantly controlled by the associated chemical modifications of the melt network. Here, we obtain in-situ (500–940 °C) Raman spectra to probe structural changes of a sodium-molybdenum borosilicate melt undergoing unmixing. The extraction of alkali and molybdenum to form droplets induces polymerization of the residual borosilicate network. Conversely, the opposite phenomenon is observed during droplet re-dissolution. This work provides new insights into the polymerization of a molybdenum-bearing borosilicate composed of two composition sets due to a miscibility gap and has direct contributions for the immobilization of nuclear wastes.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Geowissenschaften > Department für Geo- und Umweltwissenschaften
• Themengebiete: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
• ISSN: 0167577X
• Sprache: Englisch