Heat transfer in solid methyl alcohol

Heat transfer in solid methyl alcohol

Korolyuk, O.A. ; Krivchikov, A.I. ; Sharapova, I.V. ; Romantsova, O.O.

Тема: 7th International Conference on Cryocrystals and Quantum Crystals

Інший ID: PACS: 66.70.–f, 63.20.–e, 63.50.–x

URI: http://dspace.nbuv.gov.ua/handle/123456789/117111

Посилання: Heat transfer in solid methyl alcohol / O.A. Korolyuk, A.I. Krivchikov, I.V. Sharapova, O.O. Romantsova // Физика низких температур. — 2009. — Т. 35, № 4. — С. 380-384. — Бібліогр.: 34 назв. — англ.

Підтримка: The authors are sincerely grateful to B.Ya. Gorodilov, Prof. V.G. Manzhelii and Prof. F.J. Bermejo 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»).

Дата: 2009

Завантажень: 577

Heat transfer in solid methyl alcohol

Анотація:

Thermal conductivity coefficient к(T) of two crystalline (orientationally-ordered and orientationally-disordered) phases of pure methanol (at temperatures from 2 K to Tm , Tm is the melting temperature), CH₃OH + 6.6 % H₂O glass from 2 K to Tg , Tg is the glass transition temperature and a supercooled liquid from Tg to 120 K has been measured under equilibrium vapor pressure. The dependence к(T) is described approximately as a sum of two contributions: кI(T) describing heat transport by acoustic phonons and кII(T) —by localized high-frequency excitations. The temperature dependences of the thermal conductivity of primary monoatomic alcohols CH₃OH, C₂H₅OH, and C₃H₇OH in the glass state have been compared. Different mechanisms of phonon scattering in the crystalline phases and glass have been analyzed. The кII(T) has been calculated within the Cahill–Pohl model. There is an anomaly of the thermal conductivity of the glass state near Tg (a smeared minimum in the к(T) — curve).

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