Mysko-Krutik N. Structure and morphology of binary alloys based on Ar, Kr, N2, CH4

The dissertation presents the results of structural electron diffraction studies of binary alloys Ar - Kr, N2 - Kr and N2 - CH4 in all regions of mutual concentrations. Direct structural evidence of limited solubility in the Ar - Kr atomic macrosystem has been obtained. Two 2-phase regions for the N2 - Kr alloys are experimentally has been detected. The impurity influence (krypton, or methane) on the orientation order of N2 molecular crystal has been determined based on the analysis of the concentration dependence of the diffraction intensity. The kinetic of the recrystallization process caused by annealing in cryoalloys N2 - CH4 has been studied. Information about the phase diagram N2 - CH4 in the pre-melting region has been obtained. Experiments indicate that in the pre-melt region, a methane-nitrogen alloy in the 25 – 45mol. % CH4 range has a β - N2 structure, while for samples with 55 – 75 mol. % methane the lattice corresponds to HCP CH4. The cluster model of binary solutions (0 – 15 mol. % impurity) was tried out. A technique for obtaining nanostructured alloy Ar - Kr with unusual morphology: FCC and HCP phases of argon and intense halo, which is characteristic of krypton in the dispersed state has been developed. It is proved that pre-cooling gas mixtures led to the nucleation formation in the gas stream and forming of non-classical argon-krypton alloys.