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<p>The thermal conductivity <i>κ</i> of solid CO<sub>2</sub> was studied in the temperature <i>T</i> range of 100–220&#xa0;K and at pressures up to 200&#xa0;MPa using the transient hot-wire method. The results are consistent with those expected for a polycrystal composed of small molecules, with <i>κ</i> increasing significantly as the temperature decreases and as pressure and density increase. The variation in <i>κ</i> with temperature is primarily attributed to changes in phonon–phonon scattering and density. The thermal conductivity behaviour is described using a two-basis model, where heat is transported by both phonons and diffuse modes. The density <i>ρ</i> dependence of the thermal conductivity, represented by the Bridgman parameter <i>g</i> = (d ln <i>κ</i>/d ln <i>ρ</i>)<sub><i>T</i></sub>, was found to be <i>g</i> = 6.7 at 190&#xa0;K, increasing to 9.4 at 110&#xa0;K as the temperature decreases. This increase is attributed to an enhanced phonon contribution to the total <i>κ</i>.</p>

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Thermal Conductivity of Solid Carbon Dioxide

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月20日

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  • Md Saiduzzaman,
  • Viacheslav A. Konstantinov,
  • Ove Andersson

摘要

The thermal conductivity κ of solid CO2 was studied in the temperature T range of 100–220 K and at pressures up to 200 MPa using the transient hot-wire method. The results are consistent with those expected for a polycrystal composed of small molecules, with κ increasing significantly as the temperature decreases and as pressure and density increase. The variation in κ with temperature is primarily attributed to changes in phonon–phonon scattering and density. The thermal conductivity behaviour is described using a two-basis model, where heat is transported by both phonons and diffuse modes. The density ρ dependence of the thermal conductivity, represented by the Bridgman parameter g = (d ln κ/d ln ρ)T, was found to be g = 6.7 at 190 K, increasing to 9.4 at 110 K as the temperature decreases. This increase is attributed to an enhanced phonon contribution to the total κ.