Dielectric Properties of SF6–CClF3 Gas Mixtures at Nearly Liquid Densities

The second pressure virial coefficient and the second and third dielectric virial coefficients for SF₆, CClF₃, and mixtures of the two have been measured at 50°C and densities up to 5.3 mol l⁻¹. For pure SF₆, $B_{\epsilon }\text{\hspace{0.17em}=\hspace{0.17em}64.1}$ , for pure CClF₃, $B_{\epsilon }\text{\hspace{0.17em}=\hspace{0.17em}58.5}$ , both ± 0.4 cm⁶/mol². Analysis of the results using the Kielich multipole formalism gives a hexadecapole moment of 0.005 esu·nm⁴ for SF₆ and an octopole component corresponding to 0.01 esu·nm³ for CClF₃.