Lattice dynamics and phase transitions

Effect of thermal expansion on the heat transfer in hexafluoroethane $\beta$-C$_2$F$_6$

O. I. Purskii^a, V. A. Konstantinov^b, V. M. Sysoev<sup>a

a</sup> National Taras Shevchenko University of Kyiv
^b B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Khar'kov

Abstract: The thermal conductivity of solid hexafluoroethane C$_2$F$_6$ has been investigated by the plane-layer steady-state method under saturated vapor pressure at temperatures ranging from 80 K to the onset of melting. The thermal conductivity decreases with increasing temperature over the entire temperature range. The jump in the thermal conductivity upon the $\alpha$ $\to$ $\beta$ transition is approximately 6.5%. The effect of thermal expansion on the heat transfer processes in the $\beta$ phase of C$_2$F$_6$ has been studied using the modified method of reduced coordinates. The translational and translational-orientational contributions to the total thermal resistance are separated for the isobaric and isochoric cases.

Received: 07.04.2009

 English version: Physics of the Solid State, 2010, 52:1, 148–152

Bibliographic databases:

•