### Abstract

The specific heat at constant pressure C(T) of bundles of single-walled carbon nanotubes (SWNTs) closed at their ends has been investigated in a temperature interval of 2-120 K. It is found that the curve C(T) has features near 5, 36, 80, and 100 K. The experimental results on the C(T) and the radial thermal expansion coefficient aR(T) of bundles of SWNTs oriented perpendicular to the sample axis have been compared. It is found that the curves C(T) and aR(T) exhibit a similar temperature behavior at T > 10 K. The temperature dependence of the Grüneisen coefficient γ(T) has been calculated. The curve γ(T) also has a feature near 36 K. Above 36 K the Grüneisen coefficient is practically independent of temperature ( ̃ 4). Below 36 K γ(T) decreases monotonically with lowering temperature and becomes negative at T < 6 K.

Original language | English |
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Pages (from-to) | 667-673 |

Number of pages | 7 |

Journal | Fizika Nizkikh Temperatur |

Volume | 38 |

Issue number | 6 |

Publication status | Published - 1 Jun 2012 |

Externally published | Yes |

### Keywords

- Grüneisen coefficient
- Heat capacity
- Single-walled carbon nanotubes
- SWNT bundles
- Thermal expansion coefficient

### ASJC Scopus subject areas

- Physics and Astronomy(all)

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## Cite this

*Fizika Nizkikh Temperatur*,

*38*(6), 667-673.