The self-diffusion coefficients of Na in P0798 (SiO2-14.2B2O3-5Al2O3-3Li2O-3CaO-3wt%ZnO) simulated nuclear waste glass were measured by using an ion beam sputter-sectioning technique and the radioactive isotope, 22Na. The temperature dependence of the diffusion coefficients in each temperature range in P0798 glass below the glass transition temperature Tg could be expressed by:

428-574K:     D(m2/s) = 2.7 x 10-6 exp[-113(kJ/mol)/RT]

K.Nonaka, H.Nakajima, S.Mitsui, J.Echigoya: Materials Transactions, 2002, 43[4], 654-9