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An electron diffraction study of nucleation and growth of the hcp phase inlarge pure Ar and mixed Ar-Kr clusters formed by supersonic jet expansion iscarried out. The threshold cluster size corresponding to the appearance of anhcp phase in addition to the fcc structure is determined. It is found that therelative volume of the hcp phase in clusters increases with their size. In verylarge aggregations, the percentage of hcp phase reaches its maximum and doesnot change with further cluster growth. The hcp phase relative volume in mixedclusters is almost double that in pure Ar clusters of the same size. Acorrelation between the hcp phase relative volume and the number of defectiveplanes contained in the fcc matrix, which are the nuclei of the hcp phase, isestablished. A mechanism of nucleation and growth of the hcp phase in rare gasclusters is proposed.

The fcc-hcp transition in single-component and binary van der Waals clusters from electron difraction data