Abstract:Electrical resistivity and viscosity of Pb-Sb alloys are measured to investigate Peierls distortion behavior in the melts. In Pb₃₀Sb₇₀, Pb₂₀Sb₈₀, and Pb₁₀Sb₉₀ melts, temperature dependence of resistivity deviates from linear dependence during cooling. At  663 °C, different trends in isothermal behavior between experimental and theoretical resistivities, are interpreted as the existence of Peierls distortion in Sb-rich melts. In Pb₃₀Sb₇₀ and Pb₂₀Sb₈₀ melts, abnormal viscosity results verify the existence of abnormal structure transition, which is attributed to the formation of large Sb clusters with Peierls distortion. In undercooled liquid Pb₂₀Sb₈₀, minute resistivity coefficient and quadratic resistivity behavior are interpreted as the rapid increase of cluster size of Sb clusters with Peierls distortion, which provides preferential nucleation sites for higher structure similarity to the crystalline and lower liquid-solid interfacial energy.

Key words: electrical resistivity; viscosity; Peierls distortion; undercooled liquid; Pb-Sb alloys