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

2 Citations (Scopus)

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 2.3 K 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 30 K 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 60 K. The contribution of the cooperative processes of orientational disordering becomes appreciable above 180 K. In the high-temperature 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)812-819
Number of pages8
JournalFizika Nizkikh Temperatur
Volume41
Issue number8
Publication statusPublished - 1 Aug 2015
Externally publishedYes

Fingerprint

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

Keywords

  • Fullerite C
  • Heat capacity
  • Lattice dynamics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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. Fizika Nizkikh Temperatur, 41(8), 812-819.

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

In: Fizika Nizkikh Temperatur, Vol. 41, No. 8, 01.08.2015, p. 812-819.

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', Fizika Nizkikh Temperatur, vol. 41, no. 8, pp. 812-819.
Bagatskii MI, Sumarokov VV, Barabashko MS, Dolbin AV, Sundqvist B. The low-temperature heat capacity of fullerite C 60. Fizika Nizkikh Temperatur. 2015 Aug 1;41(8):812-819.
Bagatskii, M. I. ; Sumarokov, V. V. ; Barabashko, M. S. ; Dolbin, A. V. ; Sundqvist, B. / The low-temperature heat capacity of fullerite C 60. In: Fizika Nizkikh Temperatur. 2015 ; Vol. 41, No. 8. pp. 812-819.
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