The structure and magnetic properties of the non-equilibrium Fe100−xGex (x=5-40 at%) system produced by mechanical alloying

Mössbauer study of a Fe–Zr–B–Cu–(Ge, Co) nanocrystalline alloy series

“…The observed values are consistent with the previously proposed compositions [10], considering the effect of Co [14] and Ge [15] in the -Fe phase and the error bar of our experiments.…”

“…In the cases in which the crystalline contribution is clearly observed ( SITE C A >10 %), the average hyperfine field of the discrete sextets (crystalline sites contribution) is constant. Figure 3 The average value of the hyperfine field of the crystalline sites, <H> C , for Co20Ge5 alloy is slightly smaller than that of -Fe 80 Co 20 (36 T [14]), which could be justified by the presence of a small amount of Ge inside the nanocrystals [15], as it was shown previously [10].…”

“…However, the Co5Ge5 alloy shows a higher value of t. This could be due to an underestimation of the crystalline sites contribution which was restricted to values of H >32 T. If some Ge atoms were dissolved into the -Fe phase, and considering the low content of Co, it is possible to have crystalline sites with H<33 T [15] and which were fitted by the continuous distribution of hyperfine fields. In the case of Co20Ge5 alloy, the high content of Co yields to higher H values for the crystalline sites of Fe atoms.…”

Nanocrystalline Fe–Nb–(B,Ge) alloys from ball milling: Microstructure, thermal stability and magnetic properties

“…In all the studied cases, the main phase after milling is a bcc solid solution -Fe type In the case of Ge containing alloys, the lattice parameter is clearly larger than that of B alloy (2.895 and 2.8910.015 for Ge and Ge-B alloys respectively), in agreement with the effect of Ge in the lattice parameter of this phase [12,13,14]. The error bar does not allow to detect any difference between Ge-B alloy and Ge alloy (with twice the Ge content than that in Ge-B alloy), although the saturation value of Ge content inside the nanocrystals could be higher than 10 at.…”

Mössbauer spectroscopy of Fe-based nanomaterials

“…% Al at 1073 K [22]) of the equilibrium disordered bcc alloys. On the other hand, the bcc disordered nanocrystalline Fe-Ge and Fe-Al alloys can be easily produced by mechanical alloying (see, e.g., [23][24][25]). …”