Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions
The thermal conductivity of (CH4)1–c(CD4)c solid solutions with c = 0, 0.03, 0.065, 0.13, 0.22, 0.4, 0.78, and 1.0 has been measured in the region of existence of three orientational phases: disordered (phase I), partially ordered (phase II) and completely ordered (phase III). The temperature range...
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
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| Zitieren: | Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions / A.I. Krivchikov, P. Stachowiak, E. Pisarska, A. Jezowski // Физика низких температур. — 2007. — Т. 33, № 12. — С. 1393-1400. — Бібліогр.: 37 назв. — англ. |
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Krivchikov, A.I. Stachowiak, P. Pisarska, E. Jezowski, A. 2010-04-12T13:15:22Z 2010-04-12T13:15:22Z 2007 Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions / A.I. Krivchikov, P. Stachowiak, E. Pisarska, A. Jezowski // Физика низких температур. — 2007. — Т. 33, № 12. — С. 1393-1400. — Бібліогр.: 37 назв. — англ. 0132-6414 https://nasplib.isofts.kiev.ua/handle/123456789/7774 The thermal conductivity of (CH4)1–c(CD4)c solid solutions with c = 0, 0.03, 0.065, 0.13, 0.22, 0.4, 0.78, and 1.0 has been measured in the region of existence of three orientational phases: disordered (phase I), partially ordered (phase II) and completely ordered (phase III). The temperature range is 1.3–30 K. It is shown that the thermal conductivity has different temperature dependences k(T) in these phases. Its value increases with the degree of the orientational order in the phase. In phase I the thermal conductivity is independent of c and weakly dependent on T. The impurity effect in k(T) is much stronger in the low-temperature part of phase II than in phase III. As the concentration c grows, the k(T) curve of phase II approaches the dependence k(T) typical of phase I. There is a hysteresis in the vicinity of the II↔III phase transition. In phase III the impurity effect in k(T) can be considered as phonon scattering at rotational defects developing due to the difference between the moments of inertia of the CH4 and CD4 molecules. The obtained dependences of thermal conductivity on temperature and concentration can be explained qualitatively assuming that the dominant mechanism of phonon scattering is connected with the interaction of phonons with the rotational motion of the molecules in all of the three orientational phases of the CH4–CD4 system. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Динамика кристаллической решетки Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions |
| spellingShingle |
Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions Krivchikov, A.I. Stachowiak, P. Pisarska, E. Jezowski, A. Динамика кристаллической решетки |
| title_short |
Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions |
| title_full |
Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions |
| title_fullStr |
Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions |
| title_full_unstemmed |
Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions |
| title_sort |
orientational isotopic effects in the thermal conductivity of ch4/cd4 solid solutions |
| author |
Krivchikov, A.I. Stachowiak, P. Pisarska, E. Jezowski, A. |
| author_facet |
Krivchikov, A.I. Stachowiak, P. Pisarska, E. Jezowski, A. |
| topic |
Динамика кристаллической решетки |
| topic_facet |
Динамика кристаллической решетки |
| publishDate |
2007 |
| language |
English |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
The thermal conductivity of (CH4)1–c(CD4)c solid solutions with c = 0, 0.03, 0.065, 0.13, 0.22, 0.4, 0.78, and 1.0 has been measured in the region of existence of three orientational phases: disordered (phase I), partially ordered (phase II) and completely ordered (phase III). The temperature range is 1.3–30 K. It is shown that the thermal conductivity has different temperature dependences k(T) in these phases. Its value increases with the degree of the orientational order in the phase. In phase I the thermal conductivity is independent of c and weakly dependent on T. The impurity effect in k(T) is much stronger in the low-temperature part of phase II than in phase III. As the concentration c grows, the k(T) curve of phase II approaches the dependence k(T) typical of phase I. There is a hysteresis in the vicinity of the II↔III phase transition. In phase III the impurity effect in k(T) can be considered as phonon scattering at rotational defects developing due to the difference between the moments of inertia of the CH4 and CD4 molecules. The obtained dependences of thermal conductivity on temperature and concentration can be explained qualitatively assuming that the dominant mechanism of phonon scattering is connected with the interaction of phonons with the rotational motion of the molecules in all of the three orientational phases of the CH4–CD4 system.
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| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/7774 |
| citation_txt |
Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions / A.I. Krivchikov, P. Stachowiak, E. Pisarska, A. Jezowski // Физика низких температур. — 2007. — Т. 33, № 12. — С. 1393-1400. — Бібліогр.: 37 назв. — англ. |
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| first_indexed |
2025-11-28T08:59:24Z |
| last_indexed |
2025-11-28T08:59:24Z |
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