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Related Experiment Video

Updated: Oct 23, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Ni self-diffusion in glass forming Pd-Ni-S melts.

Johanna Wilden1, Fan Yang1, Gerrit Günther2

  • 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 18, 2021
PubMed
Summary

Nickel self-diffusion in Palladium-Nickel-Sulfur melts was studied using neutron scattering. Diffusion coefficients showed minimal compositional dependence and Arrhenius behavior, suggesting dynamic decoupling in these melts.

Keywords:
bulk metallic glassesmetallic meltsquasielastic neutron scatteringself-diffusionsulfurviscosity

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Neutron Scattering

Background:

  • Understanding atomic diffusion in metallic glasses is crucial for predicting their properties.
  • Palladium-Nickel-Sulfur (Pd-Ni-S) alloys are important glass-forming systems.

Purpose of the Study:

  • To investigate the self-diffusion of Nickel (Ni) in Pd-Ni-S melts.
  • To determine the temperature and compositional dependence of Ni diffusion.
  • To compare diffusion behavior derived from viscosity measurements with direct measurements.

Main Methods:

  • Incoherent, quasielastic neutron scattering (IQNS) was used to probe Ni self-diffusion.
  • Measurements were conducted on Pd40Ni40S20, Pd37Ni37S26, and Pd31Ni42S27 melts.
  • Viscosity measurements were performed under reduced gravity conditions for Pd37Ni37S26.

Main Results:

  • Ni self-diffusion coefficients were found to be on the order of 10-10 to 10-9 m2s-1.
  • Diffusion coefficients showed little dependence on alloy composition.
  • An Arrhenius-type temperature dependence was observed, with activation energies ranging from 348 ± 16 meV to 387 ± 6 meV.
  • Structural relaxation exhibited stretched exponential behavior.
  • Diffusion calculated from viscosity deviated significantly (factor of 4-8) from measured Ni self-diffusion.

Conclusions:

  • The study reveals insights into the atomic mobility of Ni in Pd-Ni-S melts.
  • The observed deviation between measured diffusion and viscosity-derived diffusion suggests dynamic decoupling of atoms in these melts.
  • Further investigation into the atomic dynamics of Pd-Ni-S melts is warranted.