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Thermal conductivity of solid parahydrogen with methane admixtures

A. I. Krivchikov·V. V. Sumarokov·J. Mucha·P. Stachowiak·A. Jezowski·O. A. Korolyuk
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Abstract

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 form 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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A. I. Krivchikov, V. V. Sumarokov, J. Mucha, P. Stachowiak, A. Jezowski, O. A. Korolyuk. 2002-12-28. Thermal conductivity of solid parahydrogen with methane admixtures. https://doi.org/10.1063/1.1582336

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