Thermodynamic Properties of Sulfur Hexafluoride |
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Authors: | J J Hurly D R Defibaugh M R Moldover |
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Affiliation: | (1) Physical and Chemical Properties Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899-8380, U.S.A. |
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Abstract: | We present new vapor phase speed-of-sound data u(P, T), new Burnett density–pressure–temperature data (P, T), and a few vapor pressure measurements for sulfur hexafluoride (SF6). The speed-of-sound data spanned the temperature range 230 K T 460 K and reached maximum pressures that were the lesser of 1.5 MPa or 80% of the vapor pressure of SF6. The Burnett (P, T) data were obtained on isochores spanning the density range 137 mol·m–3![le](/content/x8q6pv7nt4350673/xxlarge8804.gif) ![rgr](/content/x8q6pv7nt4350673/xxlarge961.gif) 4380 mol·m–3 and the temperature range 283 K T 393 K. (The corresponding pressure range is 0.3 MPa P 9.0 MPa.) The u(P, T) data below 1.5 MPa were correlated using a model hard-core, Lennard–Jones intermolecular potential for the second and third virial coefficients and a polynomial for the perfect gas heat capacity. The resulting equation of state has very high accuracy at low densities; it is useful for calibrating mass flow controllers and may be extrapolated to 1000 K. The new u(P, T) data and the new (P, T) data were simultaneously correlated with a virial equation of state containing four terms with the temperature dependences of model square-well potentials. This correlation extends nearly to the critical density and may help resolve contradictions among data sets from the literature. |
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Keywords: | Burnett measurements equation of state heat capacity intermolecular potential speed of sound sulfur hexafluoride SF6 thermodynamic properties vapor pressure virial coefficients |
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