The peculiarities of heat transfer in CO₂ and N₂O solids at low temperatures

• Veröffentlicht in: Физика низких температур
• Datum: 2007
• ISSN: 0132-6414
• Hauptverfasser: Sumarokov, V.V., Stachowiak, P., Jeżowski, A.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2007
• Schlagworte: Classical Cryocrystals
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/121794
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: The peculiarities of heat transfer in CO₂ and N₂O solids at low temperatures / V.V. Sumarokov, P. Stachowiak, A. Jeżowski // Физика низких температур. — 2007. — Т. 33, № 6-7. — С. 778-782. — Бібліогр.: 23 назв. — англ.

The thermal conductivities of CO₂ and N₂O solids have been investigated in the low-temperature range
 1–40 K. The thermal conductivities of CO₂ and N₂O are large compared with those of simple molecular crystals
 such as N₂, CO, or O₂ in the whole investigated temperature range. Analysis of the experimental data by
 the Callaway method shows that relatively large size of crystalline grains, low density of dislocations and
 weak phonon–phonon interaction might be the reasons for the good thermal conduction in these crystals at
 temperatures near the maxima. A comparison between calculated values of the intensity of normal phonon
 scattering processes and experiment gives evidence that in N₂O there is an additional (in comparison with
 CO₂) giant scattering of phonons. This scattering is described in the frameworks of soft potential model by
 the resonance phonon scattering on tunnel states and low-energy vibratons.