Deuteration effects in the thermal conductivity of molecular glasses

Автор(и)

  • A.I. Krivchikov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave, Kharkov 61103, Ukraine
  • F.J. Bermejo Instituto de Estructura de la Materia, CSIC, and Dept. Electricidad y Electrуnica-Unidad Asociada CSIC, Facultad de Ciencia y Tecnologнa, Universidad del Paнs Vasco/EHU, P.O. Box 644, E-48080-Bilbao, Spain
  • I.V. Sharapova B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave, Kharkov 61103, Ukraine
  • O.A. Korolyuk B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave, Kharkov 61103, Ukraine
  • O.O. Romantsova B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave, Kharkov 61103, Ukraine

DOI:

https://doi.org/10.1063/1.3622630

Ключові слова:

thermal conductivity, crystals, glasses, deuterated ethanol, simple monoatomic alcohols, phonon scattering, disordering, soft potential model, Boson peak.

Анотація

The thermal conductivity κ(T) of pure deuterated ethanol has been measured under its equilibrium vapor pressure in its orientationally-ordered crystal (T = 2 K – Tm), orientational glass and the glass state (T = 2 K – Tg, Tg is the glass transition temperature) solid phases. The temperature dependence of the conductivity is well described by a sum of two contributions: κ(T) = κI(T) + κII(T), where κI(T) account for the heat transport by acoustic phonons and κII(T) for the heat transfer by localized high-frequency excitations respectively. The thermal conductivities of deuterated and hydrogenated ethanols are compared in different phases. The phonon scattering mechanisms in the glasses have been analyzed. In the investigated glasses the effect of complete deuteration shows up as a contribution κII(T).

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Опубліковано

2011-04-20

Як цитувати

(1)
Krivchikov, A.; Bermejo, F.; Sharapova, I.; Korolyuk, O.; Romantsova, O. Deuteration Effects in the Thermal Conductivity of Molecular Glasses. Fiz. Nizk. Temp. 2011, 37, 651-658.

Номер

Том 37 № 6 (2011)

Розділ

Квантові ефекти в напівпровідниках та діелектриках

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