Magnetic properties of thorium and uranium borides and U1−xThxB4 solid solutions

The dependence of the magnetic susceptibility on the temperature in the compound UB4 and system U1−xThxB4 has been studied in the temperature range 140–1300°K. It has been established that the paramagnetic susceptibility does not obey the Curie-Weiss law. The experimental results are interpreted on the basis of the Stoner model of collectivized electrons which also makes it possible to explain the magnetic properties of other borides of thorium and uranium.