TRANSMISSION ELECTRON-MICROSCOPY ANALYSIS OF THE HYDROTHERMAL ALTERATION PRODUCTS OF R7T7 NUCLEAR WASTE GLASS AT 250-DEGREES-C

Authors
ABDELOUAS A CROVISIER JL CAUREL J VERNAZ E
Citation
A. Abdelouas et al., TRANSMISSION ELECTRON-MICROSCOPY ANALYSIS OF THE HYDROTHERMAL ALTERATION PRODUCTS OF R7T7 NUCLEAR WASTE GLASS AT 250-DEGREES-C, Comptes rendus de l'Academie des sciences. Serie 2, Mecanique, physique, chimie, sciences de l'univers, sciences de la terre, 317(10), 1993, pp. 1333-1340
Citations number
8
Categorie Soggetti
Multidisciplinary Sciences
Journal title
Comptes rendus de l'Academie des sciences. Serie 2, Mecanique, physique, chimie, sciences de l'univers, sciences de la terre → ACNP
ISSN journal
07644450
Volume
317
Issue
10
Year of publication
1993
Pages
1333 - 1340
Database
ISI
SICI code
0764-4450(1993)317:10<1333:TEAOTH>2.0.ZU;2-4
Abstract
Alteration experiments of R7T7 nuclear waste glass in distilled water at 250 degrees C have been performed during 1, 7 and 30 days. Ultramic rotomic thin sections were made in the alteration layers and studied u nder the transmission electron microscope. The samples altered 1 and 7 days are covered by an alteration layer rich in sheeted crystals with respective basal spacing of 7 and 10 Angstrom. Chemical microanalyses coupled with electron microdiffraction data suggest that the crystals formed after 1 and 7 days could be respectively classified as septech lorites and smectites. The sample altered for 30 days contains a smect ite (10 Angstrom), analcime and calcium silicate hydrate: gyrolite.