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

Keywords

  • Fullerite C
  • Heat capacity
  • Lattice dynamics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'The low-temperature heat capacity of fullerite C <sub>60</sub>'. Together they form a unique fingerprint.

  • 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.