J. Restrepo et Gap. Alcazar, Hyperfine magnetic field distributions of Fe0.8-qMnqAl0.2 disordered alloys: Interpretation in a local model, PHYS ST S-B, 220(1), 2000, pp. 395-399
In order to give an interpretation of the room temperature hyperfine magnet
ic field distributions of Fe0.8-qMnqAl0.2 (0 less than or equal to q less t
han or equal to 0.25) disordered alloys, we employ a local model based on a
binomial distribution method. In the model, the constituent atoms are assu
med to be randomly distributed in a b.c.c. lattice accordingly with the dis
ordered character of the system and its crystalline structure. Results show
that the substitution of an iron atom by an aluminum atom, in the first Fe
coordination shell, produces a reduction in the hyperfine field of 20.8 kO
e. Analogously, the substitution Fe by Mn originates a reduction of 24.1 kO
e. Differently from this, substitutions in the second coordination shell pr
oduce reductions of 6.6 kOe and 3.3 kOe for Al and Mn, respectively. The mo
del allows also obtaining the average hyperfine field as well as to determi
ne the most probable configurations (sites) of the system, involving neares
t and next nearest neighbors. Finally, results are compared with experiment
al results obtained by Mossbauer spectroscopy.