Structure of mixed clusters formed in supersonic jets of gas mixtures Ar-N2

The electron diffraction study of substrate-free clusters formed from nanodrops in expanding supersonic jets of gas mixtures Ar-N2 was carrier out. The average characteristic size of the clusters was varied from 20 to 200 A (angstrom), the cluster temperature being 40 K. The argon content in the gas mixture covered the whole concentration range. The experiments displayed the effect of argon enrichment of the mixed clusters Ar-N2. A method of determining the absolute component concentration in clusters was proposed. For the first time, the structures of clusters was established as a function of their size and component concentration. The obtained diagram of structural states is compared with literature data for bulk samples grown from the liquid phase. It is found, that with increase in cluster size occurs a FCC-HCP transformations while increase in argon concentration one can observe a HCP-HCP+FCC transformation, not revealed in bulk solutions. The mutual transformations of such structures in clusters occur without any change of interatomic distance