The specific heat and the radial thermal expansion of bundles of single-walled carbon nanotubes

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
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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Bagatskii, M. I., Barabashko, M. S., Dolbin, A. V., Sumarokov, V. V., & Sundqvist, B. (2012). The specific heat and the radial thermal expansion of bundles of single-walled carbon nanotubes. Fizika Nizkikh Temperatur, 38(6), 667-673.

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title = "The specific heat and the radial thermal expansion of bundles of single-walled carbon nanotubes",

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 Gr{\"u}neisen coefficient γ(T) has been calculated. The curve γ(T) also has a feature near 36 K. Above 36 K the Gr{\"u}neisen coefficient is practically independent of temperature ({\~ } 4). Below 36 K γ(T) decreases monotonically with lowering temperature and becomes negative at T < 6 K.",

keywords = "Gr{\"u}neisen coefficient, Heat capacity, Single-walled carbon nanotubes, SWNT bundles, Thermal expansion coefficient",

author = "Bagatskii, {M. I.} and Barabashko, {M. S.} and Dolbin, {A. V.} and Sumarokov, {V. V.} and B. Sundqvist",

year = "2012",

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language = "English",

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journal = "Soviet Journal of Low Temperature Physics (English Translation of Fizika Nizkikh Temperatur)",

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T1 - The specific heat and the radial thermal expansion of bundles of single-walled carbon nanotubes

AU - Bagatskii, M. I.

AU - Barabashko, M. S.

AU - Dolbin, A. V.

AU - Sumarokov, V. V.

AU - Sundqvist, B.

PY - 2012/6/1

Y1 - 2012/6/1

N2 - 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.

AB - 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.

KW - Grüneisen coefficient

KW - Heat capacity

KW - Single-walled carbon nanotubes

KW - SWNT bundles

KW - Thermal expansion coefficient

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