The characteristic features of structures and physical properties of liquid eutectic alloy

The growth of concentration fluctuations in liquid eutectic alloys

Abstract

The electrical resistivity was studied for liquid semiconductor-metal systems with multi-eutectic points, Cd-Sb, Sb-Zn and Bi-Te and ideal eutectic system with no mutual solubility in solid phases, Bi-Cd. Similarly to previous results of compound forming eutectic systems(Ga-Sb etc.) and deep eutectic systems(Au-Si, etc.), anomalous behaviors of the temperature coefficient, dρ/dT, were found at almost all the eutectic compositions also for systems studied here. The electrical conduction was discussed for inhomogeneous systems containing concentration fluctuations in the homogeneous liquid phase. The concentration fluctuation amounts to be a few volume % for Bi-Te system. The large concentration fluctuation, which may be derived from the microscopic precipitation of solid phases, grows near the eutectic composition even in the homogeneous liquids.