Theory of rare gas alloys: heat capacity
Low-temperature heat capacity of cryocrystals, which contain impurity clusters has been investigated theoretically and experimentally. Such defects might essentially enrich low-frequency part of the phonon spectrum by introducing both localized and delocalized vibrations. The effect of both types...
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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/123456789/121776 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Theory of rare gas alloys: heat capacity / M.I. Bagatskii, S.B. Feodosyev, I.A. Gospodarev, O.V. Kotlyar, E.V. Manzhelii, A.V. Nedzvetskiy, E.S. Syrkin // Физика низких температур. — 2007. — Т. 33, № 6-7. — С. 741-746. — Бібліогр.: 33 назв. — англ. |
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Bagatskii, M.I. Feodosyev, S.B. Gospodarev, I.A. Kotlyar, O.V. Manzhelii, E.V. Nedzvetskiy, A.V. Syrkin, E.S. 2017-06-16T07:21:52Z 2017-06-16T07:21:52Z 2007 Theory of rare gas alloys: heat capacity / M.I. Bagatskii, S.B. Feodosyev, I.A. Gospodarev, O.V. Kotlyar, E.V. Manzhelii, A.V. Nedzvetskiy, E.S. Syrkin // Физика низких температур. — 2007. — Т. 33, № 6-7. — С. 741-746. — Бібліогр.: 33 назв. — англ. 0132-6414 PACS: 63.20.–e; 63.20.Mt; 63.50.+x; 63.70.+h https://nasplib.isofts.kiev.ua/handle/123456789/121776 Low-temperature heat capacity of cryocrystals, which contain impurity clusters has been investigated theoretically and experimentally. Such defects might essentially enrich low-frequency part of the phonon spectrum by introducing both localized and delocalized vibrations. The effect of both types of the vibrations on the temperature dependence of the heat capacity is analyzed. Heat capacity of the disordered solid solution Kr–Ar (Ar concentration is ~25%) is studied as an example of the effect of the light weakly connected impurities on the low-temperature thermodynamic characteristics of the system. The mass defect of such an impurity induces «phonon pumping» from the low-frequency part of the spectrum into the high-frequency part and decreasing the low-temperature heat capacity, while the weakened interaction between the impurity and the host atoms combined with even weaker interaction between the impurities leads to the formation of the low-temperature maximum on the heat capacity temperature dependence. The analysis performed shows that at rather high Ar concentrations, the nonmonotonous temperature dependence of the relative change in the heat capacity of solid Kr₁₋pArp solutions is determined by excitation of delocalized high-dispersion low-frequency phonons. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Classical Cryocrystals Theory of rare gas alloys: heat capacity Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Theory of rare gas alloys: heat capacity |
| spellingShingle |
Theory of rare gas alloys: heat capacity Bagatskii, M.I. Feodosyev, S.B. Gospodarev, I.A. Kotlyar, O.V. Manzhelii, E.V. Nedzvetskiy, A.V. Syrkin, E.S. Classical Cryocrystals |
| title_short |
Theory of rare gas alloys: heat capacity |
| title_full |
Theory of rare gas alloys: heat capacity |
| title_fullStr |
Theory of rare gas alloys: heat capacity |
| title_full_unstemmed |
Theory of rare gas alloys: heat capacity |
| title_sort |
theory of rare gas alloys: heat capacity |
| author |
Bagatskii, M.I. Feodosyev, S.B. Gospodarev, I.A. Kotlyar, O.V. Manzhelii, E.V. Nedzvetskiy, A.V. Syrkin, E.S. |
| author_facet |
Bagatskii, M.I. Feodosyev, S.B. Gospodarev, I.A. Kotlyar, O.V. Manzhelii, E.V. Nedzvetskiy, A.V. Syrkin, E.S. |
| 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 |
Low-temperature heat capacity of cryocrystals, which contain impurity clusters has been investigated
theoretically and experimentally. Such defects might essentially enrich low-frequency part of the phonon
spectrum by introducing both localized and delocalized vibrations. The effect of both types of the vibrations
on the temperature dependence of the heat capacity is analyzed. Heat capacity of the disordered solid solution
Kr–Ar (Ar concentration is ~25%) is studied as an example of the effect of the light weakly connected
impurities on the low-temperature thermodynamic characteristics of the system. The mass defect of such an
impurity induces «phonon pumping» from the low-frequency part of the spectrum into the high-frequency
part and decreasing the low-temperature heat capacity, while the weakened interaction between the impurity
and the host atoms combined with even weaker interaction between the impurities leads to the formation of
the low-temperature maximum on the heat capacity temperature dependence. The analysis performed shows
that at rather high Ar concentrations, the nonmonotonous temperature dependence of the relative change in
the heat capacity of solid Kr₁₋pArp solutions is determined by excitation of delocalized high-dispersion
low-frequency phonons.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/121776 |
| citation_txt |
Theory of rare gas alloys: heat capacity / M.I. Bagatskii, S.B. Feodosyev, I.A. Gospodarev, O.V. Kotlyar, E.V. Manzhelii, A.V. Nedzvetskiy, E.S. Syrkin // Физика низких температур. — 2007. — Т. 33, № 6-7. — С. 741-746. — Бібліогр.: 33 назв. — англ. |
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| first_indexed |
2025-11-28T01:11:36Z |
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2025-11-28T01:11:36Z |
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