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Thermal conductivity of argon at high pressures and high temperatures
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Image of FIG. 1.
FIG. 1.

The DAC sample schematic. Ar sample fills the volume above and below the Ir foil (coupler). Since the coupler has a rectangular shape, Ar can freely move between the upper and the lower pockets.

Image of FIG. 2.
FIG. 2.

Representative radiometric time-resolved temperature measurements. The temperature is determined as an inverse slope of the linear lines fitted to the data. The data represent the thermal emission spectra (Iλ) transformed as shown and plotted as a function of an energetic variable. C 1 and C 2 are first and second radiation constant with values of C 1 = 119.1044 (Wnm2), C 2 = 1.4388 × 107 (nm K), respectively.

Image of FIG. 3.
FIG. 3.

The distances between the Ir foil and diamond culets measured using the spectral distance between the interference fringes. The fits applied to the data are used for the sample cavity dimensions in the FE calculations.

Image of FIG. 4.
FIG. 4.

Temperature history of the DAC for pulse laser heating at 43 GPa. Many such plots were constructed for pressures up to 50 GPa. Radiometric data from the Wien’s fits (the error bars are the temperature determination uncertainties) illustrate an increase in the sample temperature corresponding to the front edge of the laser pulse and then plateaus before decaying below the detection limit. The thick solid line is the results of the FE calculations, which represent the best fit to these data yielding the following parameters for the temperature dependent thermal conductivity of Ar: K300 = 72 W/(K m), m = 1.35—see Table I for the description of parameters. The best fit to the data calculated in the assumption that the emissivity of Ir decreased by 10% at 43 GPa essentially coincides with this curve (not shown); the parameters yielded are K300 = 79 W/(K m), m = 1.7. The thermal history, calculated taking into account the isobaric changes in density of Ar and Ir and the isobaric change in the thermal heat capacity of Ir with temperature, is shown by a thin dashed line. The temporal profile (a.u. of intensity) of the incident laser pulse (measured via a photodiode) is also included.

Image of FIG. 5.
FIG. 5.

Thermal conductivity as a function of temperature. Dashed lines show the uncertainty interval. The points indicate thermal conductivity results from MD simulations from Ref. 22 and the corresponding line is the fit to these results.

Image of FIG. 6.
FIG. 6.

Thermal conductivity as a function of pressure at 300 K. The data points (closed circles) are those determined in this work at 300 K with the corresponding errors. The separate solid and dashed lines show the results of the MD calculations using the Green-Kubo method and kinetic theory, respectively.22 The squares and the thin dashed line show the Leibfried-Schlömann equation (1) fit to our data.


Generic image for table
Table I.

Thermochemical parameters of materials used in model FE calculations.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermal conductivity of argon at high pressures and high temperatures