Thermodynamic properties of graphite-like nanostructures prepared by thermobaric treatment of fullerite C60 |
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| Authors: | A V Markin N N Smirnova I E Boronina V A Ruchenin A G Lyapin |
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| Institution: | (1) Chemistry Research Institute, N. I. Lobachevsky Nizhnii Novgorod State University, Building 5, 23 prosp. Gagarina, 603950 Nizhnii Novgorod, Russian Federation;(2) L. F. Vereshchagin Institute of High-Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow Region, Russian Federation |
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| Abstract: | Temperature dependences of the heat capacities of disordered graphite-like nanostructures prepared by the thermobaric treatment
of fullerite C60 (p = 2 and 8 GPa, T = 1373 K) were measured in the temperature ranges from 7 to 360 K in an adiabatic vacuum calorimeter and from 330 to 650
K in a differential scanning calorimeter. At T < 50 K, the dependences obtained were analyzed using the Debye theory of the heat capacity of solids and its multifractal
version. The fractal dimensions D were determined and some conclusions on the heterodynamic character of the structures studied were made. The thermodynamic
functions C
p
o
T), H
o(T) − H
o(0), S
o(T) − S
o(0), and G
o(T) − H
o(0) were calculated in the temperature range from T → 0 to 610 (650) K. The thermodynamic properties of the graphite-like nanostructures studied and some carbon allotropes were
compared. The standard entropies of formation Δf
S
o of the graphite nanostructures studied and diamond were calculated along with the standard entropies of the reactions of
their synthesis from the face-centered cubic phase of fullerite C60 and their interconversions at T = 298.15 K.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1940–1945, September, 2008. |
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| Keywords: | fullerite C60 graphite-like carbon nanostructures calorimetry heat capacity fractal dimension structure heterodynamics thermodynamic functions |
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