Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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Assia Mabrouk, Yann Vaills, Nadia Pellerin, Ahmed Bachar, 'Structural study of lanthanum sodium aluminoborosilicate glasses by NMR spectroscopy', Mat. Chem. Phys. 254 123492 (2020) doi:10.1016/j.matchemphys.2020.123492

The structural study of lanthanum sodium aluminoborosilicate (55SiO2-(25-x) Al2O3-xB2O3–15Na2O–5La2O3) glasses were investigated. The structural characterization by solid state Nuclear Magnetic Resonance have outlined the role of aluminum/boron substitution. This study has a particular interest for applications like the nuclear waste glass storage. Various types of matrices have been considered for containment: borosilicate, aluminosilicate and aluminoborosilicate, the latter with a high rare earth content ability is of particular interest. This system will be considered in our study from the point of view of a simple five-oxide glass, rich in TR2O3 (TR = La), in order to provide additional elements of understanding to the model glasses of containment for nuclear waste, lanthanum simulating, among other things, all lanthanides as well as minor actinides contained in the waste. In this paper, ourwork focused on the study of the influence of boron on the structure by solid state Nuclear Magnetic Resonance (NMR). In particular, we examine the impact of aluminum/boron substitution in a series of glasses in term of structural changes.