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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.4 (2002)  >  pp.654-659

MATERIALS TRANSACTIONS
<<Previous article Vol.43  No.4 (2002)   pp.654 - 659 Next article>>

Self-Diffusion of 22Na and 137Cs in Simulated Nuclear Waste Glass

Katsuhiko Nonaka1), Hideo Nakajima2), Seiichiro Mitsui3) and Jun-ich Echigoya1)
1) Department of Materials Science and Technology, Faculty of Engineering, Iwate University
2) The Institute of Scientific and Industrial Research, Osaka University
3) Tokai Works, Japan Nuclear Cycle Development Institute


The knowledge of self-diffusion of various elements is important for understanding and elucidating the long-term dissolution of the nuclear waste glass. The self-diffusion coefficients of Na and Cs in P0798 simulated nuclear waste glass have been measured by an ion beam sputter-sectioning technique using the radioactive isotopes 22Na and 137Cs. The temperature dependence of the diffusion coefficients in each temperature range in P0798 glass below the glass transition temperature Tg can be expressed by the following equations: (428–574 K):D_Na-belowT_g&=2.7×10^-6exp(-113 ± 4 kJ·mol^-1/RT)m^2·s^-1
(713–758 K):D_Cs-belowT_g&=7.1×10^-5exp(-241 ± 10 kJ·mol^-1/RT)m^2·s^-1The diffusion coefficient of 22Na was about ten orders of magnitude larger than that of 137Cs at 573 K. The large difference in the diffusion coefficients is explained in terms of the ion size effect, the mixed-alkali effect and lower concentration of Cs compared with Na in P0798 glass.


Keyword:
simulated nuclear waste glass, self-diffusion, radioactive isotope 22Na and 137Cs, ion beam sputter-sectioning, glass transition temperature, leaching tests, ion size effect, mixed-alkali effect

Received: October 18, 2001
Accepted: February 06, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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