Small atom diffusion and breakdown of the Stokes{endash}Einstein relation in the supercooled liquid state of the Zr{sub 46.7}Ti{sub 8.3}Cu{sub 7.5}Ni{sub 10}Be{sub 27.5} alloy
- Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, California 91125 (United States)
- I. Physikalisches Institut und Sonderforschungsbereich 345, Universitaet Goettingen, 37073 Goettingen (Germany)
- Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125 (United States)
- Hahn-Meitner-Institut Berlin, Abt. Strukturforschung, 14109 Berlin (Germany)
Be diffusivity data in the bulk metallic glass forming alloy Zr{sub 46.7}Ti{sub 8.3}Cu{sub 7.5}Ni{sub 10}Be{sub 27.5} 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 {ital T}{sub {ital g}}, a change in temperature dependence of the data is observed, and above {ital T}{sub {ital g}} 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 Zr{sub 46.7}Ti{sub 8.3}Cu{sub 7.5}Ni{sub 10}Be{sub 27.5} reveals a breakdown of the Stokes{endash}Einstein relation, indicating a cooperative diffusion mechanism in the supercooled liquid state of Zr{sub 46.7}Ti{sub 8.3}Cu{sub 7.5}Ni{sub 10}Be{sub 27.5}. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- California Institute of Technology
- DOE Contract Number:
- FG03-86ER45242
- OSTI ID:
- 396616
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 17 Vol. 69; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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