The electrical resistivity, ρ, was measured by the dc four probe method for some liquid alloys with critical mixing, that is Bi-Ga, Cd-Ga and Hg-Ga alloys. The maximum of temperature coefficient of ρ, dρ/dT, was found at the critical composition, Xc, on the isotherm for liquid Bi-Ga and Cd-Ga alloys. This tendency becomes far striking at the critical temperature Tc. However, an opposite minimum behavior of dρ/dT was found at Xc for liquid Hg-Ga alloys. The atomic volume, VM, was also measured by a picnometer method for liquid Bi-Ga alloys. The obtained VM is a linear function of composition. The value of thermal expansion coefficient, αp, near Xc is large and shows a strong temperature dependence. The critical exponent β for liquid Bi-Ga alloys is determined to be 0.365 ± 0.02 in the range, 5.6 × 10-5 ≤ ∈(=|T-Tc|/Tc) ≤ 7.5 × 10-2 from the binodal curve determined by resistivity measurements on heating with mixing by agitations.
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