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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)

Published online by Cambridge University Press:  01 February 2011

Odile Majerus
Affiliation:
odile-majerus@chimie-paristech.fr, Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Chimie Paristech (ENSCP), Paris, France
Daniel Caurant
Affiliation:
daniel-caurant@enscp.fr
Ning Li
Affiliation:
ning-li@chimie-paristech.fr, Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Chimie Paristech (ENSCP), Paris, France
Jean-Baptiste Baudouin
Affiliation:
jeanbaptiste.baudouin@gmail.com, Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Chimie Paristech (ENSCP), Paris, France
Gabriela Manolescu
Affiliation:
gabriela-manolescu@chimie-paristech.fr, Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Chimie Paristech (ENSCP), Paris, France
Philippe Barboux
Affiliation:
philippe-barboux@chimie-paristech.fr, Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Chimie Paristech (ENSCP), Paris, France
Thibault Charpentier
Affiliation:
thibault.charpentier@cea.fr, IRAMIS-SISMM, UMR CEA CNRS 3299, Saclay, France
Dominique de Ligny
Affiliation:
deligny@pcml.univ-lyon1.fr, Laboratoire de Physico-Chimie des Matériaux Luminescents, UMR CNRS 5620, Univesrité Claude Bernard Lyon I, Paris, France
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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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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