1.
Phys Rev Lett
; 84(7): 1467-70, 2000 Feb 14.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11017544
RESUMO
Using a radiotracer technique, we have measured the isotope effect E = dln(D)/dln(m(1/2)) of Co diffusion in CoxZr1-x glasses for 0. 31=x=0.86. E is close to zero (E = 0+/-0.1) in the whole range, covering 3 orders of magnitude in the diffusivity, despite the existence of large activation volumes. These results strongly suggest a highly collective diffusion mechanism to be a quite general phenomenon in metallic glasses and point to diffusion via delocalized thermal effects at certain compositions.