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Related Experiment Videos

On the premelting features in sodium clusters.

F Calvo1, F Spiegelman

  • 1Laboratoire de Physique Quantique, IRSAMC, Université Paul Sabatier, 118 Route de Narbonne, F31062 Toulouse Cedex, France.

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary
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Premelting effects in sodium clusters are significant even at medium sizes, challenging existing models. The empirical potential used is inadequate for accurately describing sodium cluster melting behavior.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Sodium clusters exhibit unique melting behaviors.
  • Previous studies suggested premelting effects were limited to larger cluster sizes.

Purpose of the Study:

  • To reexamine melting and premelting phenomena in medium-sized sodium clusters (Na(n), 55 ≤ n ≤ 147).
  • To assess the accuracy of an empirical embedded-atom potential for describing these phenomena.

Main Methods:

  • Molecular dynamics simulations using an empirical embedded-atom potential.
  • Analysis of melting and premelting effects in sodium clusters within a specific size range.

Main Results:

  • Premelting effects were observed in medium-sized sodium clusters, contrary to prior findings.

Related Experiment Videos

  • For Na(133) and Na(135), premelting effects were more pronounced than the melting process itself.
  • The empirical potential demonstrated qualitative inadequacy in modeling sodium cluster melting.

    • Conclusions:

    • Premelting is a significant factor in medium-sized sodium clusters.
    • The employed empirical embedded-atom potential is not suitable for accurately modeling sodium cluster thermodynamics.