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Structure and alteration kinetics of rare-earth rich borosilicate glasses with (64 – 2x) SiO2 / 18 B2O3 / 18 Na2O / x RE2O3 composition (RE = Y or Eu+ La)

  • Odile Majerus (a1), Daniel Caurant (a2), Ning Li (a3), Jean-Baptiste Baudouin (a4), Gabriela Manolescu (a5), Philippe Barboux (a6), Thibault Charpentier (a7) and Dominique de Ligny (a8)...

Abstract

The high level nuclear waste load is likely to increase in the future containment glasses, rising new questions about their long-term chemical durability. In this study sodium borosilicate compositions with Si substituted for RE (RE = rare earth) are altered under static conditions at fixed pH (8.5). The Na and B leached fractions reached just after the rate drop increase with the RE2O3 content. Part of the RE ions remain in the altered layer which is significantly de-polymerised (IR-ATR and NMR results). Their environment is reorganized and adopts a more centrosymetrical character. The higher leached fractions are attributed to rapid hydrolysis of Si/B-O-RE bonds with respect to Si-O-Si bonds.

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Keywords

Structure and alteration kinetics of rare-earth rich borosilicate glasses with (64 – 2x) SiO2 / 18 B2O3 / 18 Na2O / x RE2O3 composition (RE = Y or Eu+ La)

  • Odile Majerus (a1), Daniel Caurant (a2), Ning Li (a3), Jean-Baptiste Baudouin (a4), Gabriela Manolescu (a5), Philippe Barboux (a6), Thibault Charpentier (a7) and Dominique de Ligny (a8)...

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