The tracer diffusivities of various impurity atoms in metallic glass were measured, at temperatures of 604 and 690K, by using secondary ion mass spectrometry. It was found that B atoms diffused some 2 orders of magnitude faster than did Si atoms. The diffusivities of Be and Fe were intermediate, so that the overall trend in the coefficients was in the decreasing order: DB - DBe - DFe - DSi (table 164). This order was precisely opposite to the trend in the atomic radii of the diffusing species.

S.K.Sharma, M.P.Macht, V.Naundorf: Physical Review B, 1992, 46[5], 3147-50

Table 164

Diffusion of Various Solutes in Ti60Ni40