Structural characterization of SiO2-Na2O-CaO-B2O3-MoO3 glasses

Daniel Caurant (1) , Odile Majérus (1) , Edouard Fadel (1) , Marion Lenoir (1) , Christel Gervais (2) , Thibault Charpentier (3) , D.R. Neuville (4)

1 LCMCP (site ENSCP) - Laboratoire de Chimie de la Matière Condensée de Paris (site ENSCP)
2 LCMCP (site Paris VI) - Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI)
3 LSDRM - Laboratoire Structure et Dynamique par Résonance Magnétique (LCF)
4 IPGP - Institut de Physique du Globe de Paris

Nuclear spent fuel reprocessing generates high level radioactive waste with high Mo concentration that are currently immobilized in borosilicate glass matrices containing both alkali and alkaline-earth elements [1]. Because of its high field strength, Mo6+ ion has a limited solubility in silicate and borosilicate glasses and crystallization of alkali or alkaline-earth molybdates can be observed during melt cooling or heat treatment of glasses [2-4]. Glass composition changes can significantly modify the nature and the relative proportions of molybdate crystals that may form during natural cooling of the melt. For instance, in a previous work we showed that CaMoO4 crystallization tendency increased at the expenses of Na2MoO4 when B2O3 concentration increased in a SiO2-Na2O-CaO-MoO3 glass composition [4]. In this study, we present structural results on two series (Mx, By) of quenched glass samples belonging to this system using 29Si, 11B, 23Na MAS NMR and Raman spectroscopies. The effect of MoO3 on the glassy network structure is studied and its structural role is discussed (Mx series). The evolution of the distribution of Na+ ions within the borosilicate network is followed when B2O3 concentration increased (By series) and is discussed according to the evolution of the crystallization tendency of the melt. For all glasses, ESR was used to investigate the nature and the concentration of paramagnetic species.

Mots clés: glass; structure; molybdenum; MoO3; Raman; MAS NMR

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Matériaux

Daniel Caurant, Odile Majérus, Edouard Fadel, Marion Lenoir, Christel Gervais, et al.. Structural characterization of SiO2-Na2O-CaO-B2O3-MoO3 glasses. XXIst International Congress on Glass, Jul 2007, Strasbourg, France. ⟨hal-00584178⟩