Low Temperature Physics: 32, 1076 (2006); https://doi.org/10.1063/1.2389015 (2 pages)
Физика Низких Температур: Том 32, Выпуск 11 (Ноябрь 2006), c. 1414-1416    ( к оглавлению , назад )

Extraordinary temperature dependence of isochoric thermal conductivity of crystalline CO2 doped with inert gases

V.A. Konstantinov, V.G. Manzhelii, V.P. Revyakin, and V.V. Sagan

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: konstantinov@ilt.kharkov.ua

Received June 22, 2006


The isochoric thermal conductivities of solid (CO2)0.905Kr0.095 and (CO2)1–xXex(x = 0.052 and 0.097) solution of different densities was investigated in the temperature interval from 150 K to the onset of melting. An unusual effect of point defects on the thermal conductivity has been detected. In pure CO2 at T >150 K the isochoric thermal conductivity decreases smoothly with increasing temperature. In contrast, the thermal conductivity of solid CO2/Kr and CO2/Xe solutions first decreases passing through a minimum at 200–210 K and then starts to increase with temperature up to the onset of melting. This behavior of the isochoric thermal conductivity is attributed to the rotation of the CO2 molecules which gains more freedom as the spherically symmetrical inert gas atoms dissolve in CO2.

66.70.+f - Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves (for thermal conduction in metals and alloys, see 72.15.Cz and 72.15.Eb)
63.20.Ls - Phonon interactions with other quasiparticles

Ключевые слова: isochoric thermal conductivity, point defects, solid CO2, rotational correlation.