Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II
The heat capacity CP of solid Kr–n CH₄ solutions with the CH₄ concentrations n = 0.82, 0.86, 0.90 as
 well as solutions with n = 0.90, 0.95 doped with 0.002 O₂ impurity has been investigated under equilibrium
 vapor pressure over the interval 1–24 K. The (T,n)-phase diagram was refin...
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| Published in: | Физика низких температур |
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| Date: | 2007 |
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| Format: | Article |
| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/121774 |
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| Cite this: | Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II / M.I. Bagatskii, D.A. Mashchenko, V.V. Dudkin // Физика низких температур. — 2007. — Т. 33, № 6-7. — С. 728-734. — Бібліогр.: 34 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862670085217320960 |
|---|---|
| author | Bagatskii, M.I. Mashchenko, D.A. Dudkin, V.V. |
| author_facet | Bagatskii, M.I. Mashchenko, D.A. Dudkin, V.V. |
| citation_txt | Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II / M.I. Bagatskii, D.A. Mashchenko, V.V. Dudkin // Физика низких температур. — 2007. — Т. 33, № 6-7. — С. 728-734. — Бібліогр.: 34 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | The heat capacity CP of solid Kr–n CH₄ solutions with the CH₄ concentrations n = 0.82, 0.86, 0.90 as
well as solutions with n = 0.90, 0.95 doped with 0.002 O₂ impurity has been investigated under equilibrium
vapor pressure over the interval 1–24 K. The (T,n)-phase diagram was refined and the region of two-phase
states was determined for Kr–n CH₄ solid solutions. The contribution of the rotational subsystem, Crot, to
the heat capacity of the solutions has been separated. Analysis of Crot(T) at T < 3 K made it possible to estimate
the effective conversion times τ and the energy gaps E₁ and E₂ between the tunnel levels of the A-, T- and A-, E-nuclear-spin species of CH₄ molecules in the orientationally ordered subsystem, and to determine
the effective energy gaps E₁ between the lowest levels of the A- and T- species. The relations τ(n) and E₁(n)
stem from changes of the effective potential field caused as the replacement of CH₄ molecules by Kr atoms
at sites of the ordered sublattices. The effective gaps EL between a group of tunnel levels of the ground-state
libration state and the nearest group of excited levels of the libration state of the ordered CH₄ molecules in
the solutions with n = 0.90 (EL = 52 K) and 0.95 (EL = 55 K) has been estimated.
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| first_indexed | 2025-12-07T15:30:10Z |
| format | Article |
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| id | nasplib_isofts_kiev_ua-123456789-121774 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T15:30:10Z |
| publishDate | 2007 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Bagatskii, M.I. Mashchenko, D.A. Dudkin, V.V. 2017-06-16T07:17:49Z 2017-06-16T07:17:49Z 2007 Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II / M.I. Bagatskii, D.A. Mashchenko, V.V. Dudkin // Физика низких температур. — 2007. — Т. 33, № 6-7. — С. 728-734. — Бібліогр.: 34 назв. — англ. 0132-6414 PACS: 65.60.–i; 64.60.Cn; 65.40.–b; 33.15.Mt https://nasplib.isofts.kiev.ua/handle/123456789/121774 The heat capacity CP of solid Kr–n CH₄ solutions with the CH₄ concentrations n = 0.82, 0.86, 0.90 as
 well as solutions with n = 0.90, 0.95 doped with 0.002 O₂ impurity has been investigated under equilibrium
 vapor pressure over the interval 1–24 K. The (T,n)-phase diagram was refined and the region of two-phase
 states was determined for Kr–n CH₄ solid solutions. The contribution of the rotational subsystem, Crot, to
 the heat capacity of the solutions has been separated. Analysis of Crot(T) at T < 3 K made it possible to estimate
 the effective conversion times τ and the energy gaps E₁ and E₂ between the tunnel levels of the A-, T- and A-, E-nuclear-spin species of CH₄ molecules in the orientationally ordered subsystem, and to determine
 the effective energy gaps E₁ between the lowest levels of the A- and T- species. The relations τ(n) and E₁(n)
 stem from changes of the effective potential field caused as the replacement of CH₄ molecules by Kr atoms
 at sites of the ordered sublattices. The effective gaps EL between a group of tunnel levels of the ground-state
 libration state and the nearest group of excited levels of the libration state of the ordered CH₄ molecules in
 the solutions with n = 0.90 (EL = 52 K) and 0.95 (EL = 55 K) has been estimated. The work was supported by the Ukraine Ministery
 of Education and Science (Project «New quantum and anharmonic
 effects in crystal solutions», No 02.07/00391-2001). en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Classical Cryocrystals Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II Article published earlier |
| spellingShingle | Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II Bagatskii, M.I. Mashchenko, D.A. Dudkin, V.V. Classical Cryocrystals |
| title | Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II |
| title_full | Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II |
| title_fullStr | Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II |
| title_full_unstemmed | Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II |
| title_short | Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II |
| title_sort | phase transitions in solid kr–ch₄ solutions and rotational excitations in phase ii |
| topic | Classical Cryocrystals |
| topic_facet | Classical Cryocrystals |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/121774 |
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