Low Temperature Physics: 35, 307 (2009); https://doi.org/10.1063/1.3115817 (4 pages)
Физика Низких Температур: Том 35, Выпуск 4 (Апрель 2009), c. 401-404 ( к оглавлению , назад )
The thermal conductivity jump at crystal-liquid phase transition in CHCl3, C6H6, and CCl4: the action of rotational molecular motion
I.O. Pursky1, V.A. Konstantinov2, and V.V. Bulakh1
1T. Shevchenko National University of Kyiv, Faculty of Physics, 6 Glushkova Ave., Kyiv 03680, Ukraine
2B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
Received January 4, 2009
The thermal conductivity of liquid CHCl3, C6H6, and CCl4 was measured by steady-state method under saturated vapour pressure in the temperature areas that correspond to pre-crystallization temperatures. Based on the obtained experimental results, we have investigated the isobaric thermal conductivity jump ΔΛp at crystal–liquid phase transition in CHCl3, C6H6, and CCl4. The contributions of the phonon–phonon and phonon–rotational interaction to the total thermal resistance, in solid and liquid state, are specified using modified method of reduced coordinates. A reduction in the thermal conductivity ΔΛp at crystal–liquid phase transition is explained by a combined effect of variations in positional distribution of molecules and in form of rotational molecular motion.
PACS: 66.70.–f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves;
Key words: thermal conductivity, phonon–phonon and phonon–rotational scattering, thermal resistance.