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Self-instability of finite sized solid-liquid interfaces.

L K Wu1,2, B Xu1,2, Q L Li1,2

  • 1Key Laboratory of Advanced Materials of Education of China, Tsinghua University, Beijing, 100084, China.

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|December 22, 2015
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Summary
This summary is machine-generated.

Melting in small metallic nuclei occurs spontaneously via random interface breaches, a phenomenon termed "self-instability." This novel melting process at equilibrium temperature is driven by sample curvature, impacting nanoparticle and dendrite behavior.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Nanotechnology

Background:

  • Traditional melting theory describes macroscopic solids losing equilibrium under external stimuli like temperature gradients or stress.
  • Experimental observations indicate that nano- and micro-sized metallic nuclei exhibit melting behaviors inconsistent with established theories.

Purpose of the Study:

  • To investigate and elucidate the distinct melting mechanism of small-sized metallic nuclei.
  • To propose a theoretical model explaining the observed anomalous melting behavior.
  • To explore the implications of this phenomenon for nanoscale systems.

Main Methods:

  • Computational simulations were employed to model the melting process of solid nuclei.
  • Analysis focused on interface dynamics and the conditions under which melting initiates.
  • A theoretical model was developed based on the relationship between system curvature and instability.

Main Results:

  • Simulations revealed that melting in small metallic nuclei initiates through random breaches at the solid-liquid interface.
  • This 'self-instability' occurs precisely at the solid-liquid equilibrium temperature, without external disturbances.
  • A model correlating sample curvature with instability was proposed and validated against experimental data.

Conclusions:

  • Small metallic nuclei exhibit a unique, spontaneous melting process ('self-instability') driven by interface breaches.
  • Sample curvature is identified as the key factor inducing this instability at equilibrium.
  • The findings offer new insights into the behavior of small systems, with applications in dendrite fragmentation and nanoparticle stability.