Critical behavior of electrical resistivity in polar + nonpolar binary liquid systems

Abstract

The behavior of electrical resistivity in the critical region of three polar + nonpolar binary liquid systems CS₂ +(CH₃CO)₂O, C₆H₁₂+(CH₃CO)₂O, and n‐C₇H₁₆+(CH₃CO)₂O is studied. For the mixtures with critical composition, the two phase region shows a conductivity behavior with σ₁−σ₂∼ (−ε)^β with β?0.35. In the one phase region dR/dT has a singularity ε^−b with b?0.35. A possible theory of the impurity conduction is given, which broadly explains these results. The possibility of dR/dT being positive or negative is also discussed.