Structure and properties of condensed CO2–Kr films

The structure and radiation effects in condensed Co2–Kr films are investigated by using electron diffraction methods. Observations are carried out in the temperature range from 6 to 46 K. The upper boundary of the temperature interval is determined by intense sublimation of krypton. The composition of the mixture under investigation is varied from 0 to 100 mol.% Kr. An analysis of the experimental data leads to the conclusion that, in spite of the closeness of lattice parameters, the solubility of Kr in CO2 does not exceed 30 mol.%. The substitution of Kr atoms for CO2 molecules is accompanied by a considerable loosening of the matrix lattice. According to the results of observations, the solubility of CO2 molecules in Kr is beyond the accuracy of the electron diffraction technique. The lack of a noticeable solubility in this case is apparently due to a considerable difference in the molar volumes of activated CO2 particles and the inert gas. The effects of impurity atoms of the inert gas and of irradiation by electrons with an energy of tens of keV on the orientational ordering of Co2 molecules are also studied. The influence of radiation on the size of the region of existence of solid solutions is investigated. It is shown that this region is much smaller in irradiated and annealed samples than in unirradiated samples.

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