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Self-diffusion in liquid interfaces.

Simone Herth1, Feng Ye, Martin Eggersmann

  • 1Institut für Nanotechnologie, Forschungszentrum Karlsruhe GmbH, D-76021 Karlsruhe, Germany.

Physical Review Letters
|April 20, 2004
PubMed
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Self-diffusion of 59Fe in ultrafine-grained Nd2Fe14B was studied. Atomic mobility in liquid interfaces is lower than in bulk melts due to confinement, but approaches bulk values above the melting transition.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Self-diffusion is crucial for understanding material properties.
  • Liquid interfaces in materials can exhibit unique atomic mobility.
  • Neodymium-Iron-Boron (Nd2Fe14B) alloys are important magnetic materials.

Purpose of the Study:

  • To investigate self-diffusion in liquid interfaces of ultrafine-grained Nd2Fe14B.
  • To understand the effect of confinement on atomic mobility in intergranular liquid layers.
  • To compare diffusion in confined liquid interfaces with bulk melts.

Main Methods:

  • Utilized 59Fe tracer diffusion measurements.
  • Studied ultrafine-grained Nd2Fe14B with varying Nd content.
  • Investigated the intergranular melting transition phenomenon.

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Main Results:

  • Diffusion coefficient in intergranular liquid layers is lower than in bulk melts.
  • Confinement in liquid layers hampers atomic mobility.
  • Diffusivity approaches bulk melt values above the intergranular melting transition.

Conclusions:

  • Atomic mobility in confined liquid interfaces differs significantly from bulk melts.
  • The intergranular melting transition influences the diffusion behavior in Nd2Fe14B.
  • Understanding interface diffusion is key for optimizing material performance.