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Related Experiment Videos

Structure and shape variations in intermediate-size copper clusters.

Mingli Yang1, Koblar A Jackson, Christof Koehler

  • 1Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA.

The Journal of Chemical Physics
|January 21, 2006
PubMed
Summary

This study reveals copper cluster structures from 8 to 20 atoms. Larger clusters transition from layered to compact, icosahedral shapes, mirroring alkali metal behavior.

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Area of Science:

  • Computational materials science
  • Chemical physics
  • Condensed matter physics

Background:

  • Understanding the structural properties of metal clusters is crucial for catalysis and materials science.
  • Previous studies using empirical potentials provided limited accuracy for copper cluster structures.

Purpose of the Study:

  • To investigate the structural evolution of copper clusters (Cu(n)) for n=8-20 using unbiased density-functional theory (DFT) searches.
  • To compare DFT-derived structures with those predicted by older methods and identify trends.

Main Methods:

  • Extensive, unbiased structure searches employing density-functional theory (DFT).
  • Analysis of ground-state structures for copper clusters ranging from 8 to 20 atoms.

Main Results:

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  • For n=8-16, optimal structures are plateletlike with two layers and trigonal bonding networks.
  • For n>=17, structures transition to compact forms featuring an icosahedral 13-atom core.
  • Calculated structures differ significantly from previous predictions based on empirical potentials.
  • Structural evolution of Cu(n) (n<=20) closely resembles that of sodium (Na) clusters, suggesting shell-model behavior.

Conclusions:

  • DFT provides accurate ground-state structures for copper clusters, revealing a distinct size-dependent structural transition.
  • The observed structural similarity between copper and sodium clusters indicates universal shell-model-like phenomena in metal clusters.