Abstract
Intercalation of fullerite C60 with oxygen molecules is performed by two methods—under ordinary conditions of saturation at room temperature and gas pressure 1atm as well as at elevated temperature (373K) and pressure (10atm). The time dependences of the lattice parameter of fullerite during intercalation are determined. This made it possible to evaluate the activation energy and the coefficient of diffusion of oxygen molecules in fullerite C60. It is shown that increasing the temperature and pressure of the gas increases the diffusion coefficient almost five-fold: from D≈(1.6±1.9)⋅10−14cm2∕s at atmospheric pressure and room temperature to D≈(7.1±1.9)⋅10−14cm2∕s for pressure P=10atm and temperature T=373K. The oxygen concentration in octahedral voids and the temperatures of phase transitions in solutions are determined on the basis of an analysis of the results obtained together with published data on the effect of atomic and molecular impurities on the properties of C60. The effect of oxygen impurity on the properties of an orientational phase transition and the temperature dependence of the lattice parameter is investigated.
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