Low Temperature Physics: 32, 1076 (2006); https://doi.org/10.1063/1.2389015 (2 pages)
Fizika Nizkikh Temperatur: Volume 32, Number 11 (November 2006), p. 1414-1416 ( to contents , go back )
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
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.
Key words: isochoric thermal conductivity, point defects, solid CO2, rotational correlation.