Thermal conductivity of molecular crystals of monoatomic alcohols: from methanol to butanol

• Дата: 2011
• Автор: Korolyuk, O.A.
• Формат: Стаття
• Мова: English
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2011
• Назва видання: Физика низких температур
• Теми: 8th International Conference on Cryocrystals and Quantum Crystals
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/118547
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Thermal conductivity of molecular crystals of monoatomic alcohols: from methanol to butanol / O.A. Korolyuk // Физика низких температур. — 2011. — Т. 37, № 5. — С. 526–530. — Бібліогр.: 29 назв. — англ.

Experimental data on the thermal conductivity κ(T) of some simple alcohols have been compared, analyzed and generalized. The objects of investigation were methyl, protonated and deuterated ethyl, 1-propyl and 1-butyl alcohols in the thermodynamically equilibrium phase with a complete orientational order. The temperature interval was from 2 K to the melting point under the equilibrium vapor pressure. It is found that in the region above the temperature of the maximum thermal conductivity κ(T) deviates from the 1/Т law. This is because the total thermal conductivity has an extra contribution κII(T) of short-lived phonons in addition to κI(T) contributed by propagating phonons: κ(T) = κI(T) + κII(T). The contribution κI(T) is well described by the Debye–Peierls model allowing for the phonon–phonon processes and scattering of phonons by dislocations. At Т > 40 K the contribution κI(T) obeys the law A/Т and κII(T) is practically temperature-independent. It is shown that the Debye temperature ΘD of alcohol is dependent on the molecular mass as ΘD = 678М⁻⁰.⁴² K and the coefficient А characterizing the intensity of the phonon–phonon scattering increases with the molecular mass of the simple monoatomic alcohol by the law А = 0.85М⁰.⁸ W/m, which suggests a decreasing intensity of the phonon–phonon process.