Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 358, Issue 18-19, Pages 2559-2570Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2012.05.024
Keywords
Glass; Dissolution; Rate; Residual rate; Composition
Ask authors/readers for more resources
Ten borosilicate glass compositions consisting of a ternary sodium borosilicate containing increasing numbers of some of the key elements (Al, Ca, Zr, Ce) present in nuclear glasses were leached in pure water at 90 degrees C and monitored for up to 14 years. They were then characterized to establish correlations between the glass composition and the short- and long-term alteration rates. We first qualitatively explain the variations of the initial dissolution rate by structural considerations. Then we evidence a qualitative inverse correlation between the initial and residual rates. This counterintuitive result is in fact related to the effect of gel reorganization on the diffusive properties of the passivating layer. Since no equilibrium can be reached between glass and solution, these long-term experiments help in understanding how glasses behave once the solution is saturated with respect to the main glass formers. Very efficient synergy between Ca and hardener elements (Al or Zr) leads to the lowest residual rates, compared with glasses having only one of the two categories of elements. We also confirm the detrimental effect of precipitation of silicate minerals on the residual rate. (C) 2012 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available