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Small atom diffusion and breakdown on Stokes-Einstein relation in the supercooled liquid state of Zr-Ti-Cu-Ni-Be alloys

Geyer, U. and Schneider, S. and Qiu, Y. and Macht, M.-P. and Tombrello, T. A. and Johnson, W. L. (1997) Small atom diffusion and breakdown on Stokes-Einstein relation in the supercooled liquid state of Zr-Ti-Cu-Ni-Be alloys. In: Structure and Dynamics of Glasses and Glass Formers. Materials Research Society Conference Proceedings. No.455. Material Research Society , Pittsburgh, PA, pp. 301-306. ISBN 1-55899-359-2.

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Be diffusivity data in the bulk metallic glass forming alloys Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) and Zr_(46.7)Ti_(8.3)Cu_(7.5)Ni_(10)Be_(27.5) are reported for temperatures between 530K and 710K, extending up to 80K into the supercooled liquid states of the alloys. At the glass transition temperature, T_g, a change in temperature dependence of the data is observed in both alloys, and above T_g the diffusivity increases faster with temperature than below. The data in the supercooled liquid can be described by a modified Arrhenius expression containing the communal entropy of the supercooled liquid and based on a diffusion mechanism suggested earlier. The comparison with viscosity data in the supercooled liquid state of Zr_(46.7)Ti_(8.3)Cu_(7.5)Ni_(10)Be_(27.5) reveals a breakdown of the Stokes- Einstein relation, whereas D(T) and η(T) follow a relation close to van den Beukel's. The breakdown of the Stokes- Einstein relation indicates a cooperative diffusion mechanism in the supercooled liquid state of the ZrTiCuNiBe alloys.

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Additional Information:© 1997 Materials Research Society. This work was supported by the U.S. Army Research Office [Grant DAAH04-95-1-0233], by the U.S. Dept. of Energy under Grant No. DE-FG03-86ER45242, by the DFG via SFB 345, and by the National Science Foundation [Grant DMR93-18931].
Funding AgencyGrant Number
Army Research Office (ARO)DAAH04-95-1-0233
Department of Energy (DOE)DE-FG03-86ER45242
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Series Name:Materials Research Society Conference Proceedings
Issue or Number:455
Record Number:CaltechAUTHORS:20141028-150739802
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Official Citation:U. Geyer, S. Schneider, Y. Qiu, M.-P. Macht, T. A. Tombrello and W. L. Johnson (1996). Small Atom Diffusion and Breakdown on Stokes-Einstein Relation in the Supercooled Liquid State of Zr-Ti-Cu-Ni-Be Alloys. MRS Proceedings, 455, 301 doi:10.1557/PROC-455-301.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50956
Deposited By: Ruth Sustaita
Deposited On:28 Oct 2014 22:51
Last Modified:10 Nov 2021 19:03

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