A study was made of the diffusion of Hf in amorphous Ni54Zr46 at pressures of up to 1GPa. The results of these measurements could be described by the expression:

D(m2/s) = 7.4 x 10-17exp[-0.76(eV)/kT]

The associated activation volume was 0.0085nm3. The activation volume and activation energy were found to be related by Keyes’ rule, with a coefficient of 4.6. It was concluded that, in NiZr glasses, the activation volume for self-diffusion was positive and was of the order of, but less than, the relevant atomic volumes.

A.Grandjean, P.Blanchard, Y.Limoge: Physical Review Letters, 1997, 78[4], 697-7000