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The effect of glass transition in fullerite C60 on Ar impurity diffusion
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Image of FIG. 1.
FIG. 1.

Experimental data for the pressure change observed in the process of desorption of argon from a fullerite C60 sample (symbols), and the results of their description with expression (1) (line) (as an example, the values shown were obtained at a sample temperature of 68 K).

Image of FIG. 2.
FIG. 2.

Temperature dependence of the diffusion coefficient of Ar (▼) in fullerite C60. For comparison, the figure shows the temperature dependence of the diffusion coefficients of 4He (⦿, Ref. 6 × (this work)), 3He (●, Ref. 7 ), H2 (▲, Ref. 8 ), and Ne (★, Ref. 8 ) in the octahedral subsystem of fullerite cavities.

Image of FIG. 3.
FIG. 3.

Linear sections of the dependence y = ln D of x = 1/T for the diffusion coefficients of argon in fullerite. The range of the slope of the line corresponds approximately to the glass transition temperature interval of fullerite.

Image of FIG. 4.
FIG. 4.

Diffusion activation energies of impurities in fullerite C60: 3He, 4He, H2, Ne, and Ar in the octahedral subsystem of cavities (a); 3He, 4He in the octahedral and tetrahedral subsystems of cavities (b).


Generic image for table
Table I.

Molecular parameters and activation energies for the diffusion of impurity particles in fullerite C60.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The effect of glass transition in fullerite C60 on Ar impurity diffusion