The low-temperature heat capacity of fullerite C 60

M. I. Bagatskii, V. V. Sumarokov, M. S. Barabashko, A. V. Dolbin, B. Sundqvist

Research output: Contribution to journalArticle

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Abstract

The heat capacity at constant pressure of fullerite C 60 has been investigated using an adiabatic calorimeter in a temperature range from 1.2 to 120 K. Our results and literature data have been analyzed in a temperature interval from 0.2 to 300 K. The contributions of the intramolecular and lattice vibrations into the heat capacity of C 60 have been separated. The contribution of the intramolecular vibration becomes significant above 50 K. Below 2.3K the experimental temperature dependence of the heat capacity of C 60 is described by the linear and cubic terms. The limiting Debye temperature at T → 0 K has been estimated (Θ 0 =84.4 K). In the interval from 1.2 to 30K the experimental curve of the heat capacity of C 60 describes the contributions of rotational tunnel levels, translational vibrations (in the Debye model with Θ 0 =84.4 K), and librations (in the Einstein model with Θ E,lib =32.5 K). It is shown that the experimental temperature dependences of heat capacity and thermal expansion are proportional in the region from 5 to 60K. The contribution of the cooperative processes of orientational disordering becomes appreciable above 180 K. In the hightemperature phase the lattice heat capacity at constant volume is close to 4.5 R, which corresponds to the high-temperature limit of translational vibrations (3 R) and the near-free rotational motion of C 60 molecules (1.5 R).

Original languageEnglish
Pages (from-to)630-636
Number of pages7
JournalLow Temperature Physics
Volume41
Issue number8
DOIs
Publication statusPublished - 1 Jan 2015
Externally publishedYes

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specific heat
vibration
intervals
temperature dependence
libration
lattice vibrations
calorimeters
tunnels
thermal expansion
expansion
temperature
curves
molecules

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Bagatskii, M. I., Sumarokov, V. V., Barabashko, M. S., Dolbin, A. V., & Sundqvist, B. (2015). The low-temperature heat capacity of fullerite C 60. Low Temperature Physics, 41(8), 630-636. https://doi.org/10.1063/1.4928920

The low-temperature heat capacity of fullerite C 60. / Bagatskii, M. I.; Sumarokov, V. V.; Barabashko, M. S.; Dolbin, A. V.; Sundqvist, B.

In: Low Temperature Physics, Vol. 41, No. 8, 01.01.2015, p. 630-636.

Research output: Contribution to journalArticle

Bagatskii, MI, Sumarokov, VV, Barabashko, MS, Dolbin, AV & Sundqvist, B 2015, 'The low-temperature heat capacity of fullerite C 60', Low Temperature Physics, vol. 41, no. 8, pp. 630-636. https://doi.org/10.1063/1.4928920
Bagatskii MI, Sumarokov VV, Barabashko MS, Dolbin AV, Sundqvist B. The low-temperature heat capacity of fullerite C 60. Low Temperature Physics. 2015 Jan 1;41(8):630-636. https://doi.org/10.1063/1.4928920
Bagatskii, M. I. ; Sumarokov, V. V. ; Barabashko, M. S. ; Dolbin, A. V. ; Sundqvist, B. / The low-temperature heat capacity of fullerite C 60. In: Low Temperature Physics. 2015 ; Vol. 41, No. 8. pp. 630-636.
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