Na–Pb liquid alloy structure at low lead concentrations: Neutron-diffraction studies

Abstract Na–Pb liquid alloys with the lead concentration of 1.5 and 7.9 at.%, and pure sodium as a reference system are studied by neutron-diffraction at 700 K. A characteristic prepeak of static structure factor, S ( Q ), at Q ∼ 1.2 A −1 , known from neutron-diffraction studies of the Na–Pb alloys with the lead concentration of 20 at.% and higher, is not observed for the alloys under consideration. The experimental S ( Q ) values are compared with the results of molecular-dynamics simulations.