期刊
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
卷 127, 期 3, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022JE007180
关键词
thermal conductivity; CO2; planetary interior; high pressure; TDTR
资金
- Natural Sciences and Engineering Research Council of Canada [RGPIN/06818-2019]
- Ministry of Science and Technology (MOST) of Taiwan
- Foundation for the Advancement of Outstanding Scholarship, Taiwan
- [AS-CDA-106-M02]
- [AS-IA-111-M02]
- [MOST 107-2628-M-001-004-MY3]
- [110-2628-M-001-001-MY3]
- [MOST 107-2112-M-008-022-MY3]
- [110-2112-M-008-033]
In this study, the thermal conductivity of CO2 at different pressures was determined using experimental measurements and first-principles calculations. The results show that the thermal conductivity of liquid and solid CO2 varies with pressure, which has significant implications for heat flow and temperature distribution in planetary and satellite interiors.
Carbon dioxide is commonly found in terrestrial planets and its thermal property is relevant to the dynamics and evolution of those terrestrial planets. In this work, we combine time-domain thermoreflectance measurements and first-principles calculations to determine the thermal conductivity of CO2 up to 70 GPa at room temperature. Our results show that the thermal conductivity of liquid CO2 is similar to 0.22 W m(-1) K-1 at 0.3-0.5 GPa and increases to similar to 0.28 W m(-1) K-1 when the liquid CO2 transforms into molecular solid phase I (dry ice). Upon further compression, the mean value of thermal conductivity of phase I increases to 1.4-2.1 W m(-1) K-1 at similar to 10 GPa and then slightly drops across the phase I-III boundary. Phase III exhibits a gentle increase of thermal conductivity with pressure and reaches to a maximum value of similar to 4 W m(-1) K-1 at similar to 45 GPa, but shows an abrupt drop when transforming into a non-molecular amorphous solid. The pressure evolution of CO2 thermal conductivity across different phases may have significant implications for the heat flow and temperature distribution in the interiors of planets and moons containing CO2.
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