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O.V. Boltalina, V.Yu. Markov, A. Ya. Borschevskii, V. L.N. Sidorov, V. N. Bezmelnitsin, A. V. Eletskii and R. Taylor
Rapid Commun. Mass Spectrom., v. 12, pp. 1028-1030, (1998)
ABSTRACT. The vapour pressure of pure C76 and its sublimation enthalpy have been determined by Knudsen cell mass spectrometry in the temperature range 637-911 K. The temperature-pressure equation is ln(p/Pa)=(- 22806+-820)/T(K) + (24.52+-1.08). The mean sublimation enthalpy at 764 K is (190+-7) kJ*mol-1 This value is lower than that, (222+-17) kJ*mol-1, determined by us previously from a mixture of higher fullerenes, confirming further that the mixture of higher fullerenes is not an ideal solid solution.