The internal friction of monocrystals which contained 0.008wt%Sn was studied by using an inverted torsion pendulum. It was found that, at temperatures ranging from 250 to 310C, a peak grew during annealing at 510C. The peak became stable after annealing for about 10h. Its final parameters were a height of 0.057, a temperature of 305C, and an activation energy of 1.1eV. The peak was attributed to the pipe diffusion of Sn atoms along dislocations.

G.Y.Tian, J.Z.Lu, S.P.Wu, L.D.Zhang: Physica Status Solidi A, 1990, 121[2], 475-81