Partial structure factors reveal atomic dynamics in metallic alloy melts
| Autor: | Dirk Holland-Moritz, Fan Yang, Tobias Kordel, Thomas C. Hansen, Andreas Meyer, Thomas Voigtmann, Benedikt Nowak |
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| Rok vydání: | 2017 |
| Předmět: |
structural properties
mode-coupling theory Materials science Dynamical decoupling Physics and Astronomy (miscellaneous) glass-forming metallic melts diffusion Dynamics (mechanics) Neutron diffraction Structure (category theory) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Metallic alloy Crystallography neutron diffraction Chemical physics 0103 physical sciences Electrostatic levitation General Materials Science Diffusion (business) 010306 general physics 0210 nano-technology Glass transition |
| Zdroj: | Physical Review Materials. 1 |
| ISSN: | 2475-9953 |
| DOI: | 10.1103/physrevmaterials.1.025603 |
| Popis: | We investigate the dynamical decoupling of the diffusion coefficients of the different components in a metallic alloy melt, using a combination of neutron diffraction, isotopic substitution, and electrostatic levitation in Zr-Ni melts. We show that excess Ni atoms can diffuse more freely in a background of saturated chemical interaction, causing their dynamics to become much faster and thus decoupled than anticipated from the interparticle interactions. Based on the mode-coupling theory of the glass transition, the averaged structure as given by the partial static structure factors is able to explain the observed dynamical behavior. |
| Databáze: | OpenAIRE |
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