Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases
The thermal conductivity к(T) of crystalline alcohols (methyl, ethyl and 1-propyl) within their thermodynamic equilibrium phases for T ≥ 2 K and under the equilibrium vapor pressures has been measured and analyzed. While such compounds usually exhibit a rich polymorphism including amorphous and part...
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| Опубліковано в: : | Физика низких температур |
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| Дата: | 2009 |
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| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2009
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases / A.I. Krivchikov, F.J. Bermejo, I.V. Sharapova, O.A. Korolyuk, O.O. Romantsova // Физика низких температур. — 2009. — Т. 35, № 11. — С. 1143-1150. — Бібліогр.: 32 назв. — англ. |
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Krivchikov, A.I. Bermejo, F.J. Sharapova, I.V. Korolyuk, O.A. Romantsova, O.O. 2017-05-25T05:50:53Z 2017-05-25T05:50:53Z 2009 Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases / A.I. Krivchikov, F.J. Bermejo, I.V. Sharapova, O.A. Korolyuk, O.O. Romantsova // Физика низких температур. — 2009. — Т. 35, № 11. — С. 1143-1150. — Бібліогр.: 32 назв. — англ. 0132-6414 PACS: 66.70.–f, 63.20.–e https://nasplib.isofts.kiev.ua/handle/123456789/117578 The thermal conductivity к(T) of crystalline alcohols (methyl, ethyl and 1-propyl) within their thermodynamic equilibrium phases for T ≥ 2 K and under the equilibrium vapor pressures has been measured and analyzed. While such compounds usually exhibit a rich polymorphism including amorphous and partially ordered crystals, the phases here explored correspond to crystals showing complete orientational order. The results show that the temperature dependence of к(T) above its maximum deviates from the expected decrease following a 1/T law with increasing temperature arising from anharmonic interactions involving acoustic excitations. Such a deviation is here attributed to the presence of a component кII(T) corresponding to the shortest-lifetime phonons (Cahill–Pohl model) additional to that кI(T) related to propagating phonons and thus: к(T) = кI(T) + кII(T). Above T = 40 K кI(T) does follow the law 1/T and кII(T) is basically temperature independent. The component кI(T) is well described by the Debye–Peierls model taking into account the phonon–phonon Umklapp processes and phonon scattering by dislocations. In turn, the contribution кII(T) is attributed to the effects of higher lying excitations which get thermally populated above some 40 K. Finally, a systematic trend is found concerning the strength of phonon–phonon scattering which is seen to diminish as the number of carbon atoms in the alcohol molecule increases. The authors are sincerely grateful to Yu.A. Dmitriev, V.A. Konstantinov, and Prof. V.G. Manzhelii for helpful discussions and interest in this study. The investigations is made on the competition terms for joint projects of NAS of Ukraine and Russian Foundation for Fundamental Research (Agreement N 9-2008, Subject: «Collective processes in metastable molecular solids»). en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Квантовые эффекты в полупpоводниках и диэлектриках Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases |
| spellingShingle |
Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases Krivchikov, A.I. Bermejo, F.J. Sharapova, I.V. Korolyuk, O.A. Romantsova, O.O. Квантовые эффекты в полупpоводниках и диэлектриках |
| title_short |
Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases |
| title_full |
Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases |
| title_fullStr |
Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases |
| title_full_unstemmed |
Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases |
| title_sort |
experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases |
| author |
Krivchikov, A.I. Bermejo, F.J. Sharapova, I.V. Korolyuk, O.A. Romantsova, O.O. |
| author_facet |
Krivchikov, A.I. Bermejo, F.J. Sharapova, I.V. Korolyuk, O.A. Romantsova, O.O. |
| topic |
Квантовые эффекты в полупpоводниках и диэлектриках |
| topic_facet |
Квантовые эффекты в полупpоводниках и диэлектриках |
| publishDate |
2009 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
The thermal conductivity к(T) of crystalline alcohols (methyl, ethyl and 1-propyl) within their thermodynamic equilibrium phases for T ≥ 2 K and under the equilibrium vapor pressures has been measured and analyzed. While such compounds usually exhibit a rich polymorphism including amorphous and partially ordered crystals, the phases here explored correspond to crystals showing complete orientational order. The results show that the temperature dependence of к(T) above its maximum deviates from the expected decrease following a 1/T law with increasing temperature arising from anharmonic interactions involving acoustic excitations. Such a deviation is here attributed to the presence of a component кII(T) corresponding to the shortest-lifetime phonons (Cahill–Pohl model) additional to that кI(T) related to propagating phonons and thus: к(T) = кI(T) + кII(T). Above T = 40 K кI(T) does follow the law 1/T and кII(T) is basically temperature independent. The component кI(T) is well described by the Debye–Peierls model taking into account the phonon–phonon Umklapp processes and phonon scattering by dislocations. In turn, the contribution кII(T) is attributed to the effects of higher lying excitations which get thermally populated above some 40 K. Finally, a systematic trend is found concerning the strength of phonon–phonon scattering which is seen to diminish as the number of carbon atoms in the alcohol molecule increases.
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| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/117578 |
| citation_txt |
Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases / A.I. Krivchikov, F.J. Bermejo, I.V. Sharapova, O.A. Korolyuk, O.O. Romantsova // Физика низких температур. — 2009. — Т. 35, № 11. — С. 1143-1150. — Бібліогр.: 32 назв. — англ. |
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2025-12-07T16:27:19Z |
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