The Gruzin sectioning technique was used to investigate tracer diffusion and electrotransport (table 2) of 110mAg in polycrystalline samples. The bulk diffusivity at 810C ranged from 1.9 x 10-9 to 9.4 x 10-9cm2/s, while the grain-boundary diffusivity ranged from 4.9 x 10-9 to 2.08 x 10-8cm2/s. The bulk electrodiffusivity at 150 to 200C, under an applied voltage gradient of 250V/mm, was described by:

D (cm2/s) = 1.2 x 10-6exp[-0.52(eV)/kT]

while the grain-boundary electrodiffusivity at 150 to 200C, under an applied voltage gradient of 250V/mm, was described by:

D (cm2/s) = 1.5 x 10-5exp[-0.31(eV)/kT]

Metal Diffusion in Ceramics. Lutze-Birk, A., Wezranowski, E., Radwan, M.: Archiwum Elektrotechniki, 1967, 16, 807-28