The self diffusion of 59Fe in the amorphous material was investigated at 512 to 643K by using the radiotracer technique and ion-beam sputter serial sectioning. The diffusion coefficients ranged from 8.7 x 10-25 to 1.3 x 10-20m2/s. It was found that the diffusion coefficients decreased, during annealing, to values which were characteristic of a well-defined metastable relaxed amorphous state. In this state, the diffusivity obeyed:

D (m2/s) = 1.1 x 10-2 exp[-2.3(eV)/kT]

K.Pfahler, J.Horvath, W.Frank: Crystal Lattice Defects and Amorphous Materials, 1987, 17[3], 249-64