The electrical resistivity and thermopower S of pure liquid silicon and pure liquid germanium have been carefully measured. For silicon, a new containment material was used, namely high-density graphite. This graphite has a low thermopower ( at ) a high resistivity ( at ), and little or no reaction with Si, making it an ideal containment material. The results for each liquid show a metallic value of resistivity, a small but positive temperature coefficient of the resistivity and a small thermopower. In particular, for liquid Si, , and and, for liquid Ge, , and ; all values are for the respective melting temperatures of Si and Ge. We also report a calculation of the resistivity of each liquid, using the Ziman formalism, with a recent pseudopotential and an experimental structure factor. Both our experimental and our calculated results are compared with other work.

We present data, obtained by x-ray diffraction measurements, of the structure factors for pure liquid Si, and for liquid Ni-Si and Cu-Si alloys. We find it possible to analyse these data as well as data for Fe-Si by decomposition of rg(r) where g(r) is the pair distribution function; this analysis provides evidence for Si-Si covalency both in pure liquid Si and in the Si-rich liquid alloys. The degree of covalency in the Si-rich alloys appears to increase with changing species in the order Fe to Ni to Cu.

A method is described which permits direct measurement of the electrical resistivity, ρ, of liquid metals to temperatures above 1900°C. The method is applied to the measurement of ρ and dρ/dT for liquid Fe and liquid Pt. For liquid Fe we find ρ = 137.6 ± 1.0 and dρ/dT = .018 ± .003 ; for liquid Pt the results are ρ = 82.6 ± 2.0 and dρ/dT = 0.00 ± .01. The units are µΩ-cm and µΩ-cm/°C, respectively

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The authors have measured the electrical resistivity, rho , and the thermopower, S, for the liquid alloy MgZn across the entire concentration range. New data for rho and S for pure liquid Zn are also reported. Data for the liquid alloy are shown to be consistent with the Faber-Ziman theory, provided the pseudopotential for Zn is assumed to be energy dependent. A comparison of the data for the liquid alloy with data previously reported for the solid amorphous alloy indicate that this energy dependence should also be considered in the solid.