Abstract
In the last years the liquid alkali-Pb alloys have been studied extensively. The measurements made include resistivity, structure factor, and the specific heat capacity. These alloys show anomalous behavior at either the octet composition with 80 at. % alkalimetal or at the equiatomic composition. From the resistivity measurements follows that a shift in stoichiometry occurs between Na-Pb and K-Pb. Whereas liquid Na-Ph, just as Li-Ph forms an octet compound, the K-Pb, Rb-Pb and Cs-Pb systems form only an equiatomic compound. In this paper we present the results of neutron diffraction and specific heat measurements. Together they constitute evidence for the formation of (Pb{sub 4}){sup 4-}-ions in liquid K-Pb, Rb-Pb and Cs-Pb.
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