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

• Published in: Физика низких температур
• Date: 2012
• ISSN: 0132-6414
• Main Authors: Bagatskii, M.I., Barabashko, M.S., Dolbin, A.V., Sumarokov, V.V.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2012
• Subjects: Наноструктуры при низких температурах
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/117246
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: The specific heat and the radial thermal expansion of bundles of single-walled carbon nanotubes / M.I. Bagatskii, M.S. Barabashko, A.V. Dolbin, V.V. Sumarokov // Физика низких температур. — 2012. — Т. 38, № 6. — С. 667-673. — Бібліогр.: 51 назв. — англ.

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
 αR(T) of bundles of SWNTs oriented perpendicular to the sample axis have been compared. It is found that the
 curves C(T) and αR(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 (γ ≈ 4). Below 36 K γ(T) decreases monotonically
 with lowering temperature and becomes negative at T < 6 K.