Magnetic Susceptibility Measurements on Liquid Metals and Alloys

摘要

The magnetic susceptibilities of the pure metals In, Hg, Zn, Pb, Sn and Bi and the alloy Hg-In as a function of concentration of In in Hg have been measured as a function of temperature through the melting point and well into the liquid state by a microbalance system using the Curie technique for the purpose of the investigation of the structure of liquid metals and alloys. The experimental system was evaluated by making measurements of the temperature dependence of the susceptibility of Cu where a comparison could be made with data available in the literature. Analysis of this data indicates that the average effective mass change is independent of volume change and that part of the temperature dependence of the susceptibility of Cu derives from the variation of the cyclotron effective mass and its influence on the diamagnetic component of the electronic susceptibility. The results for In and Hg suggest that the effective mass in liquid In differs from the free electron value to a greater extent (15%) than that in Hg (6%), however, the temperature dependence observations for In indicate a nearly free electron behavior, which to explain the temperature dependence of Hg requires an adjustment of the effective mass parameter. For the Hg-In system susceptibility anomalies observed at Hg4In and Hg-In suggest a change in electronic structure, and the temperature dependence at the Hg rich end of the alloy system indicates that a simple nearly free electron model is not obeyed. (Author)