The low-temperature heat capacity of fullerite C₆₀
The heat capacity at constant pressure of fullerite C₆₀ 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...
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| Дата: | 2015 |
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| Автори: | , , , , |
| Формат: | Стаття |
| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2015
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| Назва видання: | Физика низких температур |
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| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/127965 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | The low-temperature heat capacity of fullerite C₆₀ / М.I. Bagatskii, V.V. Sumarokov, M.S. Barabashko, A.V. Dolbin, B. Sundqvist// Физика низких температур. — 2015. — Т. 41, № 8. — С. 812–819. — Бібліогр.: 54 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-1279652018-01-01T03:03:35Z The low-temperature heat capacity of fullerite C₆₀ Bagatskii, M.I. Sumarokov, V.V. Barabashko, M.S. Dolbin, A.V. Sundqvist, B. Наноструктуры при низких температурах The heat capacity at constant pressure of fullerite C₆₀ 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 C₆₀ 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 C60 is described by the linear and cubic terms. The limiting Debye temperature at T → 0 K has been estimated (Θ0 = 84.4 K). In the interval from 1.2 to 30 K the experimental curve of the heat capacity of C₆₀ describes the contributions of rotational tunnel levels, translational vibrations (in the Debye model with Θ0 = 84.4 K), and librations (in the Einstein model with ΘE,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 C60 molecules (1.5 R). 2015 Article The low-temperature heat capacity of fullerite C₆₀ / М.I. Bagatskii, V.V. Sumarokov, M.S. Barabashko, A.V. Dolbin, B. Sundqvist// Физика низких температур. — 2015. — Т. 41, № 8. — С. 812–819. — Бібліогр.: 54 назв. — англ. 0132-6414 PACS: 65.40.Ba, 65.80.–g, 81.05.ub http://dspace.nbuv.gov.ua/handle/123456789/127965 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Наноструктуры при низких температурах Наноструктуры при низких температурах |
| spellingShingle |
Наноструктуры при низких температурах Наноструктуры при низких температурах Bagatskii, M.I. Sumarokov, V.V. Barabashko, M.S. Dolbin, A.V. Sundqvist, B. The low-temperature heat capacity of fullerite C₆₀ Физика низких температур |
| description |
The heat capacity at constant pressure of fullerite C₆₀ 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 C₆₀
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 C60 is described by the linear and cubic
terms. The limiting Debye temperature at T → 0 K has been estimated (Θ0 = 84.4 K). In the interval from 1.2 to
30 K the experimental curve of the heat capacity of C₆₀ describes the contributions of rotational tunnel levels,
translational vibrations (in the Debye model with Θ0 = 84.4 K), and librations (in the Einstein model with
ΘE,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 C60 molecules (1.5 R). |
| format |
Article |
| author |
Bagatskii, M.I. Sumarokov, V.V. Barabashko, M.S. Dolbin, A.V. Sundqvist, B. |
| author_facet |
Bagatskii, M.I. Sumarokov, V.V. Barabashko, M.S. Dolbin, A.V. Sundqvist, B. |
| author_sort |
Bagatskii, M.I. |
| title |
The low-temperature heat capacity of fullerite C₆₀ |
| title_short |
The low-temperature heat capacity of fullerite C₆₀ |
| title_full |
The low-temperature heat capacity of fullerite C₆₀ |
| title_fullStr |
The low-temperature heat capacity of fullerite C₆₀ |
| title_full_unstemmed |
The low-temperature heat capacity of fullerite C₆₀ |
| title_sort |
low-temperature heat capacity of fullerite c₆₀ |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2015 |
| topic_facet |
Наноструктуры при низких температурах |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/127965 |
| citation_txt |
The low-temperature heat capacity of fullerite C₆₀ / М.I. Bagatskii, V.V. Sumarokov, M.S. Barabashko, A.V. Dolbin, B. Sundqvist// Физика низких температур. — 2015. — Т. 41, № 8. — С. 812–819. — Бібліогр.: 54 назв. — англ. |
| series |
Физика низких температур |
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2023-10-18T20:54:18Z |
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