Measurements were made of the diffusion of radioactive 110mAg in polycrystalline Pb(Ni1/3Nb2/3)O3-35PbTiO3-15PbZrO3 piezoelectric ceramic. The material belonged to the perovskite family. The data could be described by:

sδD (m3/s) = 3.7 x 10-9 exp[-168(kJ/mol)/RT]

This unusually large combined pre-exponential factor implied the occurrence of marked segregation of Ag at the grain boundaries, and a low solid solubility within the grains.

D.J.Lewis, D.Gupta, M.R.Notis, Y.Imanaka: Journal of the American Ceramic Society, 2001, 84[8], 1777-84