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Effects of UO3 on the structure, thermal and chemical stability of borosilicate glass matrix

DOI: 10.1016/j.jnoncrysol.2024.123054 DOI Help

Authors: I. Tolnai (HUN-REN Centre for Energy Research) , J. Osan (HUN-REN Centre for Energy Research) , F. Pinakidou (Aristotle University of Thessaloniki) , Zs. Kovacs (Eötvös Loránd University) , M. Fabian (HUN-REN Centre for Energy Research)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Non-Crystalline Solids , VOL 637

State: Published (Approved)
Published: August 2024
Diamond Proposal Number(s): 33573

Open Access Open Access

Abstract: he glass matrix of composition: 55SiO2–10B2O3–25Na2O-5BaO-5ZrO2 was incorporated with 10 to 40 wt% of UO3 by melt quenching technique. Neutron diffraction and Reverse Monte Carlo simulations revealed that the borosilicate network consists of SiO4, BO3 and BO4 units; upon adding 10 % UO3 the B-O coordination increases from 3.08 to 3.86 and subsequently decreases with a further in increase in UO3 content. X-ray absorption near edge and Extended X-ray absorption studies revealed that U exist in 5+ and 6+ oxidation states with U-O coordination numbers of 8 and 6 respectively. The thermal stability decreases and weight losses increases with the addition of UO3 in the glass matrix, the sample with 30 wt% UO3 has thermal stability comparable to that of matrix glass and exhibits lowest dissolution rate in water. Nanoindentation measurements showed that the microstructure of sample with 30 wt% UO3 is 11 % weaker than that of the matrix glass.

Journal Keywords: Borosilicate glass; Uranium oxidation state; Neutron diffraction; Reverse Monte Carlo simulation; Thermal characteristics; leaching test

Subject Areas: Materials, Chemistry, Environment

Instruments: B18-Core EXAFS

Added On: 03/06/2024 08:22


Discipline Tags:

Earth Sciences & Environment Radioactive Materials Physical Chemistry Chemistry Materials Science Nuclear Waste Inorganic Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS) X-ray Absorption Near Edge Structure (XANES)