Thermal Conductivity of Helium and Argon at High Pressure and High Temperature.

ABSTRACT: Helium (He) and argon (Ar) are important rare gases and pressure media used in diamond-anvil cell (DAC) experiments. Their thermal conductivity at high pressure-temperature (P-T) conditions is a crucial parameter for modeling heat conduction and temperature distribution within a DAC. Here we report the thermal conductivity of He and Ar over a wide range of high P-T conditions using ultrafast time-domain thermoreflectance coupled with an externally heated DAC. We find that at room temperature the thermal conductivity of liquid and solid He shows a pressure dependence of P^0.86 and P^0.72, respectively; upon heating the liquid, He at 10.2 GPa follows a T^0.45 dependence. By contrast, the thermal conductivity of solid Ar at room

SUBMITTER: Hsieh WP 

PROVIDER: S-EPMC9573036 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature