Structure and magnetic properties of Sm2Fe17−xMox compounds

In this work, the Rietveld analysis shows that for Sm2Fe17−xMox,x≤0.58, the structure is rhombohedral of Th2Zn17 type, for x=1 the structure is tetragonal of ThMn12 type. For x=0.6 the most suitable space group for the structure description is P21/c of Nd3(FeTi)29 type. The solubility of Mo in the 2/17 structure predicted by atomistic simulation has been demonstrated. The Mössbauer spectra analysis corroborates the X-ray structure results for which Mo atoms are located in the 6c position (dumbbell site) unlike Si and Ga located in 18h site.Thermomagnetic measurements indicate that the Curie temperature (TC) of the 2/17 phase increase up to 429 K, for the 3/29 and 1/12 phases, TC is, respectively, equal to 459 K and 538 K.