Breaux GA, Hillman DA, Neal CM, Benirschke RC, Jarrold MF. Gallium Cluster “Magic Melters”.
J Am Chem Soc 2004;
126:8628-9. [PMID:
15250696 DOI:
10.1021/ja0477423]
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Abstract
Calorimetry measurements (using a method based on multicollision induced dissociation) have been performed for unsupported gallium clusters, Gan+ (n = 30-50 and 55). Melting transitions have been identified from spikes in the heat capacities recorded as a function of temperature. There are enormous fluctuations in the melting temperatures and the heats of fusion with cluster size. Clusters with n = 31, 33, 37, and 45-47 are "magic melters" with particularly well-defined melting transitions. There is a strong correlation between the heats of fusion, entropies of fusion, and the stabilities of the clusters. However, these quantities are not strongly correlated with the melting temperatures.
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