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 σ ₁−σ ₂~ (σ ε )^β with β?0.35. In the one phase region dR/dT has a singularity β ^−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.