Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases

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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Збережено в:
Бібліографічні деталі
Дата:2009
Автори: Krivchikov, A.I., Bermejo, F.J., Sharapova, I.V., Korolyuk, O.A., Romantsova, O.O.
Формат: Стаття
Мова:English
Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2009
Назва видання:Физика низких температур
Теми:
Квантовые эффекты в полупpоводниках и диэлектриках
Онлайн доступ:http://dspace.nbuv.gov.ua/handle/123456789/117578
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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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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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spelling irk-123456789-1175782017-05-26T03:02:31Z 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 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. 2009 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/117578 en Физика низких температур 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 Квантовые эффекты в полупpоводниках и диэлектриках
Квантовые эффекты в полупpоводниках и диэлектриках
spellingShingle Квантовые эффекты в полупpоводниках и диэлектриках
Квантовые эффекты в полупpоводниках и диэлектриках
Krivchikov, A.I.
Bermejo, F.J.
Sharapova, I.V.
Korolyuk, O.A.
Romantsova, O.O.
Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases
Физика низких температур
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.
format Article
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.
author_sort Krivchikov, A.I.
title Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases
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
publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
publishDate 2009
topic_facet Квантовые эффекты в полупpоводниках и диэлектриках
url http://dspace.nbuv.gov.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.
series Физика низких температур
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first_indexed 2023-10-18T20:30:08Z
last_indexed 2023-10-18T20:30:08Z
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