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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| Дата: | 2007 |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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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irk-123456789-77742010-04-13T12:01:48Z Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions Krivchikov, A.I. Stachowiak, P. Pisarska, E. Jezowski, A. Динамика кристаллической решетки 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. 2007 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/7774 en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Динамика кристаллической решетки Динамика кристаллической решетки |
| spellingShingle |
Динамика кристаллической решетки Динамика кристаллической решетки Krivchikov, A.I. Stachowiak, P. Pisarska, E. Jezowski, A. Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions |
| 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. |
| format |
Article |
| author |
Krivchikov, A.I. Stachowiak, P. Pisarska, E. Jezowski, A. |
| author_facet |
Krivchikov, A.I. Stachowiak, P. Pisarska, E. Jezowski, A. |
| author_sort |
Krivchikov, A.I. |
| title |
Orientational isotopic effects in the thermal conductivity of CH4/CD4 solid solutions |
| 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 |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2007 |
| topic_facet |
Динамика кристаллической решетки |
| url |
http://dspace.nbuv.gov.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 |
2023-10-18T16:38:18Z |
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2023-10-18T16:38:18Z |
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