First-Principles Structures and Stabilities of AlN+ (N = 46−62) Clusters
- 1 July 2006
- journal article
- letter
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 110 (29), 14020-14023
- https://doi.org/10.1021/jp0630166
Abstract
We present plausible candidates for the global minimum structures of Al(N)(+) (N = 46-62) cluster ions, determined by pseudopotential density functional theory static calculations under the spin-polarized generalized gradient approximation. Our calculations provide a first important step toward the rationalization of recent calorimetric experiments on the meltinglike transition of Al(N)(+). Most clusters with N > or = 48 clearly adopt fragments of the face-centered-cubic (fcc) crystalline lattice, although with significant distortions and a substantial proportion of defects in some cases. Another important driving force for stabilization comes from (111)-like surfaces, as the clusters often prefer to adopt less compact structures in order to keep the proportion of (100)-like surfaces at a minimum level. Al(46)(+) and Al(47)(+) adopt rather disordered structures instead. We find indications of enhanced stabilities for N = 51, 57, and 61 and of a substantial structural change between Al(55)(+) and Al(56)(+). These features correlate, albeit qualitatively, with the experimental observations.Keywords
This publication has 31 references indexed in Scilit:
- Melting and evaporation transitions in small Al clusters: canonical Monte-Carlo simulationsZeitschrift für Physik B Condensed Matter, 2005
- Close packing of clusters: Application toPhysical Review B, 2003
- Genetic-algorithms search for global minima of aluminum clusters using a Sutton-Chen potentialPhysical Review B, 2003
- A model metal potential exhibiting polytetrahedral clustersThe Journal of Chemical Physics, 2003
- Stacking faults in close-packed clustersThe European Physical Journal D, 2002
- Melting behavior of large disordered sodium clustersThe European Physical Journal D, 2001
- On the temperature, equipartition, degrees of freedom, and finite size effects: Application to aluminum clustersThe Journal of Chemical Physics, 2000
- Clusters of aluminium, a density functional studyPhysical Chemistry Chemical Physics, 1999
- Ionization potential of aluminum clustersPhysical Review B, 1998
- Efficacious Form for Model PseudopotentialsPhysical Review Letters, 1982