Thermal conductivity of solid parahydrogen with methane admixtures

Thermal conductivity of solid parahydrogen with methane admixtures

Krivchikov, A.I. ; Sumarokov, V.V. ; Mucha, J. ; Stachowiak, P. ; Jezowski, A. ; Korolyuk, O.A.

Тема: 3-й Международный семинар по физике низких температур в условиях микрогравитации

Інший ID: PACS: 66.70.+f, 67.80.Gb, 67.80.Mg

URI: http://dspace.nbuv.gov.ua/handle/123456789/128871

Посилання: 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.

Підтримка: We are grateful to Prof. V.G. Manzhelii, Dr. B.Ya. Gorodilov for helpful discussions. The study described in this publication was made possible in part Grant N 2M/78-2000 of Ukrainian Min. of Education and Science.

Дата: 2003

Завантажень: 457

Thermal conductivity of solid parahydrogen with methane admixtures

Анотація:

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.

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