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Published October 21, 1996 | public
Journal Article Open

Small atom diffusion and breakdown of the Stokes–Einstein relation in the supercooled liquid state of the Zr46.7Ti8.3Cu7.5Ni10Be27.5 alloy


Be diffusivity data in the bulk metallic glass forming alloy Zr46.7Ti8.3Cu7.5Ni10Be27.5 are reported for temperatures between 530 and 710 K, extending 85 K into the supercooled liquid state of the alloy. At the glass transition temperature Tg, a change in temperature dependence of the data is observed, and above Tg the diffusivity increases more quickly with temperature than below. The data in the supercooled liquid can be described by a modified Arrhenius expression based on a diffusion mechanism suggested earlier. The comparison with viscosity data in the supercooled liquid state of Zr46.7Ti8.3Cu7.5Ni10Be27.5 reveals a breakdown of the Stokes–Einstein relation, indicating a cooperative diffusion mechanism in the supercooled liquid state of Zr46.7Ti8.3Cu7.5Ni10Be27.5.

Additional Information

©1996 American Institute of Physics. Received 25 June 1996; accepted 16 August 1996. This work was supported in part (U.G.) by the U.S. Army Research Office (Grant No. DAAH04-95-1-0233), and in part (S.S.) by the U.S. Dept. of Energy under Grant No. DE-FG03-86ER45242, by the Deutsche Forschungsgemeinschaft via SFB 345 (S.S.), and by the National Science Foundation [Grant No. DMR93-18931 (Y.Q. & T.A.T.)].


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