Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane
The heat capacity C of fullerite doped with deuteromethane (CD₄)₀.₄(C₆₀) has been investigated in the temperature interval 1.2–120 K. The contribution CD₄ ΔC of the CD₄ molecules to the heat capacity C has been separated. It is shown that at T ≈ 120 K the rotational motion of CD₄ molecules in the...
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| Published in: | Физика низких температур |
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| Date: | 2012 |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2012
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| Cite this: | Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane / M.I. Bagatskii, V.V. Sumarokov, A.V. Dolbin // Физика низких температур. — 2012. — Т. 38, № 1. — С. 87-94. — Бібліогр.: 59 назв. — англ. |
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Bagatskii, M.I. Sumarokov, V.V. Dolbin, A.V. 2017-05-16T15:44:39Z 2017-05-16T15:44:39Z 2012 Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane / M.I. Bagatskii, V.V. Sumarokov, A.V. Dolbin // Физика низких температур. — 2012. — Т. 38, № 1. — С. 87-94. — Бібліогр.: 59 назв. — англ. PACS: 65.40.Ba, 65.80.–g66.35.+a, 81.05.ub 0132-6414 https://nasplib.isofts.kiev.ua/handle/123456789/116828 The heat capacity C of fullerite doped with deuteromethane (CD₄)₀.₄(C₆₀) has been investigated in the temperature interval 1.2–120 K. The contribution CD₄ ΔC of the CD₄ molecules to the heat capacity C has been separated. It is shown that at T ≈ 120 K the rotational motion of CD₄ molecules in the octahedral cavities of the C₆₀ lattice is weakly hindered. As the temperature decreases to 80 K, the rotational motion of the CD4 molecules changes from weakly hindered rotation to libration. In the range T = 1.2–30 K CD₄ ΔC is described quite accurately by the sum of contributions from the translational and librational vibrations and tunneling rotation of the CD₄ molecules. The contribution of tunneling rotation to the heat capacity CD₄ ΔC T( ) is dominant below 5 K. The effect of nuclear-spin conversion of the CD₄ molecules upon the heat capacity has been observed and the characteristic times of nuclear spin conversion between the lowest levels of the A- and T-species of the CD₄ molecules at T < 5 K have been estimated. A feature observed in the curve CD₄ ΔC T( ) near T = 5.5 K is most likely a manifestation of a first-order phase transition in the orientational glass of the solution. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Наноструктуры при низких температурах Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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| title |
Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane |
| spellingShingle |
Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane Bagatskii, M.I. Sumarokov, V.V. Dolbin, A.V. Наноструктуры при низких температурах |
| title_short |
Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane |
| title_full |
Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane |
| title_fullStr |
Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane |
| title_full_unstemmed |
Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane |
| title_sort |
low-temperature heat capacity of fullerite c₆₀ doped with deuteromethane |
| author |
Bagatskii, M.I. Sumarokov, V.V. Dolbin, A.V. |
| author_facet |
Bagatskii, M.I. Sumarokov, V.V. Dolbin, A.V. |
| topic |
Наноструктуры при низких температурах |
| topic_facet |
Наноструктуры при низких температурах |
| publishDate |
2012 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
The heat capacity C of fullerite doped with deuteromethane (CD₄)₀.₄(C₆₀) has been investigated in the temperature
interval 1.2–120 K. The contribution CD₄ ΔC of the CD₄ molecules to the heat capacity C has been separated.
It is shown that at T ≈ 120 K the rotational motion of CD₄ molecules in the octahedral cavities of the C₆₀
lattice is weakly hindered. As the temperature decreases to 80 K, the rotational motion of the CD4 molecules
changes from weakly hindered rotation to libration. In the range T = 1.2–30 K CD₄ ΔC is described quite accurately
by the sum of contributions from the translational and librational vibrations and tunneling rotation of the
CD₄ molecules. The contribution of tunneling rotation to the heat capacity CD₄ ΔC T( ) is dominant below 5 K.
The effect of nuclear-spin conversion of the CD₄ molecules upon the heat capacity has been observed and the
characteristic times of nuclear spin conversion between the lowest levels of the A- and T-species of the CD₄
molecules at T < 5 K have been estimated. A feature observed in the curve CD₄ ΔC T( ) near T = 5.5 K is most
likely a manifestation of a first-order phase transition in the orientational glass of the solution.
|
| isbn |
PACS: 65.40.Ba, 65.80.–g66.35.+a, 81.05.ub |
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/116828 |
| citation_txt |
Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane / M.I. Bagatskii, V.V. Sumarokov, A.V. Dolbin // Физика низких температур. — 2012. — Т. 38, № 1. — С. 87-94. — Бібліогр.: 59 назв. — англ. |
| work_keys_str_mv |
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2025-12-07T13:10:58Z |
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2025-12-07T13:10:58Z |
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