Volume 51, Number 1, July I 2000
|Page(s)||75 - 81|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Isotope effect of diffusion in thin amorphous layers during structural relaxation
Lehrstuhl für Materialverbunde, Technische Fakultät der Universität
Kaiserstraße 2, D-24143 Kiel, Germany
2 Institut für Metallphysik, Universität Göttingen Hospitalstraße 3-7, D-37073 Göttingen, Germany
Corresponding author: firstname.lastname@example.org
Accepted: 3 May 2000
The time dependence and the isotope effect of Co diffusion have been measured in amorphous during structural relaxation. The radiotracer technique in conjunction with serial sectioning using ion-beam sputtering was employed to observe diffusion on a nanometer scale. A drastic drop of diffusivity during structural relaxation in these thin films was found which is of the same order of magnitude observed in much thicker glasses(Dörner W. and Mehrer H., Phys. Rev. B, 44 (1991) 101). This seems to rule out annihilation of quenched-in free volume at the outer surface. In contrast to measurements in melt-spun amorphous , where a change in E from in the as-quenched state to in the relaxed state has been measured (Rätzke K. et. al., Phys. Rev. Lett., 68 (1992) 2347), no change in E has been observed in during structural relaxation. The low value of E =0.01(2) in the relaxed and even in the as-quenched state in the present alloy strongly suggests collective diffusion mechanisms in the relaxed and also as-quenched state.
PACS: 61.43.-j – Disordered solids / 66.30.Fq – Self-diffusion in metals, semimetals, and alloys / 72.15.Lh – Relaxation times and mean free paths
© EDP Sciences, 2000
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