Melting, Premelting, and Structural Transitions in Size-Selected Aluminum Clusters with around 55 Atoms
- 5 May 2005
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 94 (17), 173401
- https://doi.org/10.1103/physrevlett.94.173401
Abstract
Heat capacities have been determined for unsupported aluminum clusters, , from 150 to 1050 K. Peaks in the heat capacities due to melting occur between 450 and 650 K (well below the bulk melting point of 933 K). The peaks for and are bimodal, suggesting the presence of a premelting transition where the surface of the clusters melts around 100 K before the core. For clusters with the melting temperatures suddenly drop, and there is a dip in the heat capacities due to a transition between two solid forms before the clusters melt.
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