The grain boundary diffusion of Ga in polycrystalline magnesium was investigated using the radiotracer residual activity technique and 67Ga. The diffusion measurements were carried out under Harrison B-type kinetic conditions at 639 to 872K. The results could be described by:

D(m2/s) = 1.2 x 10-4exp[-134.3(kJ/mol)/RT]

sδDgb(m3/s) = 3.8 x 10-9exp[-94.9(kJ/mol)/RT]

I.Stlouka, J.Čermák: Defect and Diffusion Forum, 2005, 237-240, 1287-92