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Second-order phase transitions in amorphous gallium clusters.

Gary A Breaux1, Baopeng Cao, Martin F Jarrold

  • 1Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47404, USA.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
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Gallium clusters (29-55 atoms) were studied for phase transitions. Most showed a distinct melting point, but some exhibited a gradual melting, suggesting amorphous structures influence cluster behavior.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Understanding phase transitions in finite systems is crucial for materials science.
  • Gallium clusters offer a model system to study melting phenomena at the nanoscale.

Purpose of the Study:

  • To investigate the nature of phase transitions in gallium clusters containing 29-55 atoms.
  • To differentiate between first-order and continuous melting behaviors in these nanoscale systems.

Main Methods:

  • Utilizing ion mobility and calorimetry techniques.
  • Analyzing the thermodynamic and dynamic properties of gallium clusters during phase transitions.

Main Results:

  • Most gallium clusters (29-55 atoms) exhibited a first-order phase transition, characteristic of melting.

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  • A subset of clusters displayed melting without significant latent heat, indicative of a continuous transition.
  • The observed continuous transitions are proposed as finite-size analogs of second-order phase transitions.

    • Conclusions:

    • The solidlike phase of certain gallium cluster sizes may be amorphous, leading to continuous melting.
    • Cluster size and structural properties significantly influence the type of phase transition observed.
    • These findings provide insights into the unique melting behaviors of nanoscale materials.