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Kinetics of Phase Separation in Lithium Bearing HLW Alkaliborosilicate Glasses

Published online by Cambridge University Press:  15 February 2011

J. GÖttlicher  and
H. J. Pentinghaus
J. GÖttlicher
Affiliation:
Forschungszentrum Karlsruhe GmbH, Institut für Technische Chemie, Geo- und Wassertechnologie, Technische Mineralogie, Postfach 3640, D-76021 Karlsruhe
H. J. Pentinghaus
Affiliation:
Forschungszentrum Karlsruhe GmbH, Institut für Technische Chemie, Geo- und Wassertechnologie, Technische Mineralogie, Postfach 3640, D-76021 Karlsruhe
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Abstract

A TEM study on the kinetics of metastable phase separation in a lithium bearing HLW glass frit is presented. As nothing was known about the kinetics of metastable phase separation below the glass transformation temperature we had to carry out annealing experiments just above and below the transformation temperature, in order to achieve phase separation on a laboratory time scale- Particle growth in the WAKID5 HLW glass frit at 550 °C occurs by a diffusion controlled Ostwald ripening process (about 40 °C above Tg). Metastable phase separation in the lithium bearing glasses even at lower temperatures cannot be excluded from the present study. In NaBSi3O8 glass (Tg ≈ 580 °C) phase separation could be detected at 500 °C well below Tg after about 160 days.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 412: Symposium V – Scientific Basis for Nuclear Waste Management XIX , 1995 , 123
Copyright
Copyright © Materials Research Society 1996

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