Low Temperature Physics: 29, 527 (2003); https://doi.org/10.1063/1.1582336 (3 pages)
Физика Низких Температур: Том 29, Выпуск 6 (Июнь 2003), c. 706-709    ( к оглавлению , назад )

Thermal conductivity of solid parahydrogen with methane admixtures

A.I. Krivchikov

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

V.V. Sumarokov, J. Mucha, P. Stachowiak, A. Jezowski

W. Trzebiatowski Institute for Low Temperature Physics and Structure Research of the Polish Academy of Sciences, P.O. Box 937, 50-950 Wroclaw, Poland

O.A. Korolyuk

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47, Ave. Lenin, Kharkov, 61103, Ukraine

Received December 19, 2002

Аннотация

The thermal conductivity of solid parahydrogen crystal with methane admixtures has been measured in the temperature range 1.5 to 8 K. Solid samples were grown from the gas mixture at 13 K. Concentration of CH4 admixture molecules in the gas varied from 5 to 570 ppm. A very broad maximum of thermal conductivity with absolute value of about 110 W/(m×K) is observed at 2.6 K. The data are interpreted by Callaway model considering phonons resonant scattering on quasi-local vibrations of CH4 molecules, phonon-grain boundary and phonon-phonon scattering processes. The increase of grain boundary scattering leads to the decrease of the maximum broadening. The analysis shows that the solid mixture of p-H2 and CH4 is a heterogeneous solution for CH4 concentration higher than 0.1 ppm.

PACS:
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)
67.80.Gb - Thermal properties
67.80.Mg - Defects, impurities, and diffusion