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2025
ACL
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Meriem Ben Zennou, Ahmed Bachar, Meriem Chrifi Alaoui, Frédéric Jenot, Rachid Amrousse, Aurélien Canizares, Yann Vaills, Stuart Hampshire, Mohamed Rguiti, Assia Mabrouk, 'Effects of La2O3 on structure and mechanical properties of sodium borosilicate glass', Ceram. Int. (2025) doi:10.1016/j.ceramint.2025.05.337
To develop rare-earth-doped borosilicate glasses with enhanced mechanical properties, lanthanum sodium borosilicate glasses were successfully synthesized using a fusion method. The glass composition was (mol.%): 55SiO2 - 25B2O3 – (20-x)Na2O - xLa2O3 (x = 1, 2, 3, 4, and 5). The primary aim was to investigate the impact of Na2O substitution by La2O3 on the structural and mechanical characteristics of the glasses. X-ray diffraction analysis confirmed the amorphous nature of the samples, while Raman and Fourier-transform infrared spectroscopy indicated a conversion of BO3 to BO4 units. Additionally, differential thermal analysis revealed an increase in both glass transition and crystallization temperatures with higher La2O3 content. The inclusion of La2O3 enhanced the glass density, Vickers hardness, fracture toughness, and Young's modulus, owing to the larger ionic radius of La3+ compared to other components. In summary, the incorporation of an optimal concentration of La2O3 significantly improves the mechanical properties of these sodium borosilicate glasses, making them more suitable for applications involving the containment of actinides in nuclear fuel reprocessing.
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