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 refined and the regio...
Gespeichert in:
| Veröffentlicht in: | Физика низких температур |
|---|---|
| Datum: | 2007 |
| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
|
| Schlagworte: | |
| Online Zugang: | https://nasplib.isofts.kiev.ua/handle/123456789/121774 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | 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. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
nasplib_isofts_kiev_ua-123456789-121774 |
|---|---|
| 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 |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Phase transitions in solid Kr–CH₄ solutions and rotational excitations in phase II |
| 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_short |
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_sort |
phase transitions in solid kr–ch₄ solutions and rotational excitations in phase ii |
| author |
Bagatskii, M.I. Mashchenko, D.A. Dudkin, V.V. |
| author_facet |
Bagatskii, M.I. Mashchenko, D.A. Dudkin, V.V. |
| topic |
Classical Cryocrystals |
| topic_facet |
Classical Cryocrystals |
| publishDate |
2007 |
| 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 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.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/121774 |
| 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. |
| work_keys_str_mv |
AT bagatskiimi phasetransitionsinsolidkrch4solutionsandrotationalexcitationsinphaseii AT mashchenkoda phasetransitionsinsolidkrch4solutionsandrotationalexcitationsinphaseii AT dudkinvv phasetransitionsinsolidkrch4solutionsandrotationalexcitationsinphaseii |
| first_indexed |
2025-12-07T15:30:10Z |
| last_indexed |
2025-12-07T15:30:10Z |
| _version_ |
1850863947756863488 |