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Small atom diffusion and breakdown of the Stokes–Einstein relation in the supercooled liquid state of the Zr46.7Ti8.3Cu7.5Ni10Be27.5 alloy
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1996
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Quantum LiquidEngineeringGlass-forming LiquidDiffusion MechanismGlass TransitionSuperconductivityQuantum MaterialsZr46.7ti8.3cu7.5ni10be27.5 AlloyMaterials ScienceStokes–einstein RelationHigh-tc SuperconductivityPhysicsSmall Atom DiffusionAtomic PhysicsCooperative Diffusion MechanismBulk Metallic GlassSolid-state PhysicMicrostructureHigh Temperature MaterialsCondensed Matter PhysicsApplied PhysicsAlloy Phase
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.