Magnetic properties of compounds

The structure and magnetic properties of the compounds (x = 0 - 1.0) have been investigated. All the compounds crystallize in -type structure. Substitution of Y for Pr led to a monotonic decrease in the lattice constants and the unit-cell volume. Samples in this alloy system exhibit a crossover from ferromagnetic ordering for to antiferromagnetic ordering for as a function of concentration. The low-temperature behaviours of samples in the range were studied using magnetic measurements. Based on the magnetic measurements the tentative magnetic phase diagram showing three concentration regions of qualitatively different magnetic behaviour has been determined. Increasing substitution of Y for Pr in shows a depression of ferromagnetic ordering and the gradual development of antiferromagnetic ordering. For compounds with the magnetization first shows a clear ferromagnetic transition at , followed by a gradual drop at lower temperature, and then increases again. For compounds with x < 0.4 or , only ferromagnetic ordering or antiferromagnetic ordering occurs respectively.