The Hall Coefficients of Li–Mg Alloys

Abstract

The temperature and concentration dependences of the Hall coefficients in β-phase of lithium-magnesium alloys (0∼70 at.%Mg) have been measured from 77°K to the room temperature. In the temperature range investigated, Hall coefficient is almost independent of the temperature except pure lithium. The dependence of Hall coefficient (R_H) on electron-atom ratio (e/a) is approximately represented by a third-degree polynomial; R_H×10¹¹(m³⁄A.s)=85.58(e/a)³−333.31(e/a)²+443.00(e/a)−210.80. Although there is fluctuation to some extent in the experimental data, a distinct agreement is found between the experimental results and the prediction by four-OPW calculation. For this reason, the four-OPW model is thought to be a good approximation for this alloy phase. The experimental result suggests the contact of the Fermi surface to the {110} zone boundary at e/a=1.3. The result also suggests that overlap through {110} zone face does not occur in the measured range.