Thermal conductivity of solid parahydrogen with methane admixtures

• Published in: Физика низких температур
• Date: 2003
• Main Authors: Krivchikov, A.I., Sumarokov, V.V., Mucha, J., Stachowiak, P., Jezowski, A., Korolyuk, O.A.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2003
• Subjects: 3-й Международный семинар по физике низких температур в условиях микрогравитации
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/128871
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Thermal conductivity of solid parahydrogen with methane admixtures / A.I. Krivchikov, V.V. Sumarokov, J. Mucha, P. Stachowiak, A. Jezowski, O.A. Korolyuk // Физика низких температур. — 2003. — Т. 29, № 6. — С. 706-709. — Бібліогр.: 18 назв. — англ.

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.