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Hot and solid gallium clusters: too small to melt.

Gary A Breaux1, Robert C Benirschke, Toshiki Sugai

  • 1Chemistry Department, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405-7102, USA.

Physical Review Letters
|December 20, 2003
PubMed
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Small gallium cluster ions melt at significantly higher temperatures than bulk gallium, challenging previous predictions. This study reveals melting transitions for Ga+39 and Ga+40 around 550 K, unlike Ga+17.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Understanding the thermodynamic properties of small metal clusters is crucial for their applications.
  • Bulk gallium melts at 302.9 K, but cluster behavior is less understood.
  • Previous theories suggested small gallium clusters would remain liquid at much lower temperatures.

Purpose of the Study:

  • To determine the energy content and melting behavior of mass-selected gallium cluster ions.
  • To investigate the temperature-dependent properties of Ga+(n) clusters.
  • To compare the melting points of small gallium clusters with bulk gallium.

Main Methods:

  • Utilized a novel multicollision induced dissociation (MCID) scheme.
  • Measured energy content for Ga+(n) (n=17, 39, 40) over a 90-720 K temperature range.

Related Experiment Videos

  • Analyzed heat capacity to identify melting transitions.

    • Main Results:

    • Observed a broad heat capacity maximum around 550 K for Ga+39 and Ga+40, indicating melting.
    • Found that these small gallium clusters melt at temperatures substantially above bulk gallium's melting point.
    • No melting transition was detected for Ga+17 within the studied temperature range.

    Conclusions:

    • Small gallium clusters exhibit significantly higher melting points than bulk gallium.
    • The observed melting behavior contradicts expectations of low-temperature liquidity for these clusters.
    • Cluster size plays a critical role in determining melting point and thermodynamic stability.