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Dissolution of a Sphene Glass‐Ceramic, and of Its Component Sphene and Glass Phases, in Ca‐Na‐Cl Brines
Author(s) -
Hayward Peter J.,
Doern Diane C.,
George Ian M.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06551.x
Subject(s) - dissolution , leaching (pedology) , aluminosilicate , ceramic , materials science , glass ceramic , mineralogy , metallurgy , geology , chemical engineering , chemistry , soil water , biochemistry , soil science , engineering , catalysis
Leaching experiments for up to 569 d have been performed to examine the dissolution in Ca‐Na‐Cl groundwater of a sphene (CaTiSiO 5 )‐based glass‐ceramic, a candidate material for immobilizing nuclear fuel recycle wastes. The experiments involved leaching of samples of a simulated‐waste‐loaded glass‐ceramic, doped with 22 Na or 45 Ca, in a synthetic groundwater at 25° and 100°C. The results are compared with those from separate leaching experiments with 22 Na‐ or 45 Ca‐doped samples of aluminosilicate glass and ceramic sphene, representing the component phases of the glass‐ceramic. The comparison supports a model in which the glass‐ceramic dissolution rate may be approximately derived from the weighted average of the separate dissolution rates of its component glass and ceramic phases. No synergistic effects in the leaching of the glass and ceramic phases in the glass‐ceramic were found.