TY - JOUR
T1 - Embedded atom calculations of the equilibrium shape of small platinum clusters
AU - Sachdev, A.
AU - Masel, R. I.
AU - Adams, J. B.
N1 - Funding Information:
This work was supported by the National Science Foundation under Grant DMR 89-20358. The authors thank Murray Daw, Steve Foiles, and Mike Baskes for providing a copy of the EAM code, a modified version of which was used for all of the calculations in this paper.
PY - 1992/8
Y1 - 1992/8
N2 - The embedded atom method was used to examine the shapes and stability of a series of platinum clusters with 5-60 atoms. The calculations suggest that the polyhedral structures seen in previous calculations are not stable. While the magic-number icosahedrons,cubo-octahedrons, tetrahedrons, and octahedrons retain their shape at 0 K, they spontaneously reconstruct upon annealing to 300 K. The nonmagic-number truncated icosahedrons, cubo-octahedrons, tetrahedrons, and octahedrons spontaneously reconstruct even at 0 K. A 147-atom icosahedron was also found to reconstruct to a lower energy structure upon annealing to 500 K. In contrast, there are a series of lower energy structures which are reasonably stable at 100-300 K. These lower energy structures are highly disordered and show surface structures which are not present in bulk platinum. At this point the calculations have not yet considered the effects of the support. However, these results suggest that small platinum clusters may be much more disordered than previous calculations suggest.
AB - The embedded atom method was used to examine the shapes and stability of a series of platinum clusters with 5-60 atoms. The calculations suggest that the polyhedral structures seen in previous calculations are not stable. While the magic-number icosahedrons,cubo-octahedrons, tetrahedrons, and octahedrons retain their shape at 0 K, they spontaneously reconstruct upon annealing to 300 K. The nonmagic-number truncated icosahedrons, cubo-octahedrons, tetrahedrons, and octahedrons spontaneously reconstruct even at 0 K. A 147-atom icosahedron was also found to reconstruct to a lower energy structure upon annealing to 500 K. In contrast, there are a series of lower energy structures which are reasonably stable at 100-300 K. These lower energy structures are highly disordered and show surface structures which are not present in bulk platinum. At this point the calculations have not yet considered the effects of the support. However, these results suggest that small platinum clusters may be much more disordered than previous calculations suggest.
UR - http://www.scopus.com/inward/record.url?scp=0013160782&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0013160782&partnerID=8YFLogxK
U2 - 10.1016/0021-9517(92)90065-P
DO - 10.1016/0021-9517(92)90065-P
M3 - Article
AN - SCOPUS:0013160782
VL - 136
SP - 320
EP - 333
JO - Journal of Catalysis
JF - Journal of Catalysis
SN - 0021-9517
IS - 2
ER -