Abstract
The degree of alteration of a multiphase ceramic waste form (Synroc-D) exposed to flowing water at 75/sup 0/C is reported. After 117 days, a 25- to 30-..mu..-deep leach zone developed from which all silicate phases have congruently dissolved. The associated spinel and titanate phases appear unaltered, whereas an Al(OH)/sub 3/ precipitate approx. = 5-..mu..m-thick develops at the sample surface. The dissolution of silicates and deposition of the precipitate are simulated using a modification of the crackling-core model. The model predictions closely match the observed behavior of the material. Implications of these results for long-term stability of the waste form are discussed.
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