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Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
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Self- and interdiffusion in dilute liquid germanium-based alloys.

H Weis1, F Kargl, M Kolbe

  • 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
|July 26, 2019
PubMed
Summary
This summary is machine-generated.

Diffusion in liquid germanium alloys was measured using neutron scattering and capillary experiments. Results show diffusion is collective, not dependent on atomic mass, with lower coefficients for Ce and Gd additions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Understanding diffusion mechanisms in liquid metals is crucial for materials processing and predicting alloy behavior.
  • Liquid germanium alloys serve as model systems due to their unique properties and potential applications.

Purpose of the Study:

  • To measure self- and inter-diffusion coefficients in liquid germanium and its dilute alloys.
  • To investigate the influence of different solute elements (Si, Au, In, Ce, Gd) on diffusion.
  • To elucidate the underlying diffusion mechanism in these loosely-packed liquid systems.

Main Methods:

  • Quasi-elastic neutron scattering (QENS) for atomic dynamics.
  • In situ long-capillary experiments with X-ray radiography for diffusion profiling.
  • Microgravity experiments to eliminate convection effects.

Main Results:

  • Self- and inter-diffusion coefficients were found to be equal within experimental error for all investigated alloys.
  • Alloys containing Cerium (Ce) and Gadolinium (Gd) exhibited smaller interdiffusion coefficients.
  • No correlation was observed between the atomic mass of the solute additions and the diffusion coefficients.

Conclusions:

  • Diffusion in these liquid alloys is a highly collective process.
  • The atomic mass of solutes does not significantly impact diffusion in this system.
  • The findings provide insights into the fundamental nature of diffusion in loosely-packed metallic liquids.