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. https://resolver.caltech.edu/CaltechAUTHORS:20141028-150739802
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Abstract
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.
| Item Type: | Book Section | ||||||||||
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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]. | ||||||||||
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| Series Name: | Materials Research Society Conference Proceedings | ||||||||||
| Issue or Number: | 455 | ||||||||||
| DOI: | 10.1557/PROC-455-301 | ||||||||||
| Record Number: | CaltechAUTHORS:20141028-150739802 | ||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20141028-150739802 | ||||||||||
| 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 | ||||||||||
| Collection: | CaltechAUTHORS | ||||||||||
| Deposited By: | Ruth Sustaita | ||||||||||
| Deposited On: | 28 Oct 2014 22:51 | ||||||||||
| Last Modified: | 10 Nov 2021 19:03 |
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