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Effect of Dry Density on Activation Energy for Diffusion ofStrontium in Compacted Sodium Montmorillonite

Published online by Cambridge University Press:  03 September 2012

Tamotsu Kozaki ,
Hiroki Sato ,
Atsushi Fujishima ,
Nobuhiko Saito ,
Seichi Sato  and
Hiroshi Ohashi
Tamotsu Kozaki
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan, kozaki@hune.hokudai.ac.jp
Hiroki Sato
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan, kozaki@hune.hokudai.ac.jp
Atsushi Fujishima
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan, kozaki@hune.hokudai.ac.jp
Nobuhiko Saito
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan, kozaki@hune.hokudai.ac.jp
Seichi Sato
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan, kozaki@hune.hokudai.ac.jp
Hiroshi Ohashi
Affiliation:
Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060, Japan, kozaki@hune.hokudai.ac.jp
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Abstract

For performance assessments of geological disposal of high-level radioactivewaste, activation energies for the diffusion of strontium ions and the basalspacings of compacted sodium montmorillonite in the water-saturated statewere determined.

Basal spacings determined by XRD indicated changes in the interlamellarspace from a three-water layer hydrate state to a two-water layer hydratestate as the dry density of the montmorillonite increased from 1.0 to 1.8 Mg m-3. Activation energies from 17.3 to 30.8 kJ mol-1for the apparent diffusion coefficients of strontium ions were obtained. Thelower activation energies than for diffusion of strontium ions in free waterwere determined for montmorillonite specimens of lower dry density (1.2 Mg m-3 and below), while the higher activation energies were athigher dry densities (1.4 Mg m-3 and above).

These findings cannot be explained by changes in only the geometricparameters, which the pore water diffusion model is based upon. Possibleexplanations for the dry density dependence of the activation energy are thechanges of the temperature dependence of the distribution coefficientsand/or of the diffusion process with increasing dry density

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 893
Copyright
Copyright © Materials Research Society 1997

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References

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