Magnetic properties of the iron sublattice in the YFe12xMx compounds (M = Ti, Mo or V; x = 1–3.5)

摘要

The magnetic properties of the YFe12xMx compounds (M = Ti, Mo or V; x = 1–3.5) have been determined in the orde red ferromagnetic state as well as in the paramagnetic state. The iron magnetic moment has been determined from 4 K up to the Curie temperature whereas the analysis of the paramagnetic region has led to the determination of the effective iron magnetic moment. The number of spins has been calculated below and above the Curie temperature in order to discuss the degree of itinerancy of the Fe magnetic behavior in the YFe12xMx compounds. All the YFe12xMx compounds (M = Ti, Mo or V; x = 1–3.5) have very similar crystalline properties: they crystallize in the same crystal structure and all the M elements used here are known to substitute for iron on the same crystal site. In contrast, they exhibit a wide range of magnetic behavior; the Curie temperature varies from 63 to 539 K and the mean magnetic moment per iron atom is also very dependent upon the M element used and its concentration. Furthermore the degree of itinerancy of the iron is not preserved along YFe12xMx compounds but is found to depend significantly upon the nature of the substituting element M and its concentration. The results are discussed and compared to earlier published results obtained on binary R–Fe and ternary R–Fe–B compounds.