THE ROLE OF FLUCTUATIONS ON THE ELECTRICAL-RESISTIVITY AND ATOMIC VOLUME FOR SOME LIQUID ALLOYS WITH CRITICAL MIXING

The electrical resistivity, rho, was measured by the de four probe met hod for some liquid alloys with critical mixing, that is Bi-Ga, Cd-Ga and HS-Ga alloys. The maximum of temperature coefficient of rho, d rho /dT, was found at the critical composition, X(c), on the isotherm for liquid Bi-Ga and Cd-Ga alloys. This tendency becomes far striking at t he critical temperature T-c. However, an opposite minimum behavior of d rho/dT was found at X(c) for liquid Hg-Ga alloys. The atomic volume, V-M, was also measured by a picnometer method for liquid Bi-Ga alloys . The obtained V-M is a linear function of composition. The value of t hermal expansion coefficient, alpha p, near X(c) is large and shows a strong temperature dependence. The critical exponent beta for liquid B i-Ga alloys is determined to be 0.365 +/- 0.02 in the range, 5.6 X 10( -5)less than or equal to epsilon(=\T-T-c\/T-c)less than or equal to 7. 5 X 10(-2) from the binodal curve determined by resistivity measuremen ts on heating with mixing by agitations.