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The vapor pressures of C 76 were measured over the temperature range 834−1069 K by the torsion−effusion method. The results are well represented by the following linear equation: log( p /kPa) = (8.23 ± 0.20) − (10150 ± 150)/( T /K). The standard sublimation enthalpy of this compound, Δ sub H °(298) = 206 ± 4 kJ mol -1, as derived by second-law elaboration of the experimental data, is proposed. Some structural aspects of C 76 and C 84 crystals were investigated by X-ray analysis. Considerations on the thermodynamic properties of these compounds are also reported.
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Brunetti et al. (1997) studied this question.
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