Abstract
Polycrystalline powders of Mn5-xFexSi3 (x = 2.5, 3.0, 3.5, 4.0) compounds (Mn5Si3-type, space group P63/mcm, No. 193) were prepared by solid state reaction of pure Mn, Fe and Si powders under High Vacuum (HV) conditions at T = 1000 °C. Samples were sintered at T = 1100 °C under HV as well as under Ar-4%H2 conditions. X-ray Diffraction (XRD) analysis revealed that the compounds crystallize with hexagonal symmetry in accordance with previous reports. The χac susceptibility measurements for the samples sintered under HV conditions show systematic strengthening of the ferromagnetic (FM) state upon increasing x. The electrical resistivity, ρ, remains metallic for all x, with a very weak temperature dependence at T > 300 K. At T < 300 K, ρ(T) shows a linear temperature dependence with a change of slope observed upon approaching the corresponding magnetic ordering temperature. For the samples sintered under flowing Ar-4%H2 atmosphere, the electrical properties are similar to those of the samples sintered under HV, while a strong enhancement of χac was observed.
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