Sodium tracer diffusion coefficients, D*Na, were measured using the radioactive isotope Na-22 in sodium boroaluminosilicate (NBAS) glasses containing either a small amount of As2O3 or Fe2O3. The compositions of the first type of glass were given by [(Na2O)0.71(Fe2O3)0.05(B2O3)0.24]0.2[(SiO2)x(Al2O3)1-x]0.8 and those of the second type of glasses corresponded to [(Na2O)0.73(B2O3)0.24(As2O3)0.03]0.18[(SiO2)x(Al2O3)1-x]0.82. Tracer diffusion measurements were performed between 198 and 350C. Pre-annealing of the glass samples at their glass transition temperatures in common air was found to lead to changes in the values of sodium tracer diffusion coefficients. For the NBAS glasses containing Fe2O3, after pre-annealing for 5 h, the activation enthalpy derived for the sodium tracer diffusion increases almost linearly from 57.5 to 71.3 kJ/mol with a decrease in the alumina content while the pre-exponential factor of the sodium tracer diffusion coefficient increases from 2.1 x 10− 4 to 5.3 x 10−4 cm2/s. For the iron-free NBAS glasses pre-annealed for 5 h, the activation enthalpy varies between 63.9 and 71.4 kJ/mol while the pre-exponential factor varies between 1.5 x 10− 4 and 1.2·x 10− 3 cm2/s. In addition, it was observed that the considered glasses take up water when annealed at 300C in wet air with PH2O = 474mbar.Sodium Tracer Diffusion in Sodium Boroaluminosilicate Glasses. X.Wu, J.D.Moskowitz, J.C.Mauro, M.Potuzak, Q.Zheng, R.Dieckmann: Journal of Non-Crystalline Solids, 2012, 358[12-13], 1430-7