Abstract
Recently we have studies β-Al9Si(Mn1−x Fe x )3 using Mössbauer effect spectroscopy withx=0.28 and discovered a new transition at about 80 K. Neutron diffraction studies down to low temperatures reveal no structural changes, so that this transition at 80 K is indeed of magnetic origin. The magnetic susceptibility shows a small maximum near this temperature superimposed on a large Curie-like background. In addition to this transition, the Curie-like background shows a cusp near 4 K. We thus infer a magnetic double transition in this disordered alloy. These magnetic transitions have been followed to lower Fe concentrations (x=0.10 and 0.20) by both Mössbauer spectroscopy (T c ) and by magnetic susceptibility (T g). It is found thatT C decreases rapidly with decreasing Fe concentration, whileT g remains relatively constant. The saturation hyperfine fieldB hf(0) decreases rapidly with decreasingx, indicating that the Fe atoms loose their magnetic moments in the limit of infinite dilution, and the important role played by Fe−Fe nearest neighbors in determining the magnetic properties.
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Brand, R.A., Le Caër, G., Dubois, J.M. et al. The magnetic transition in Fe-substituted hexagonal β-Al9SiMn3 phase. Hyperfine Interact 54, 473–478 (1990). https://doi.org/10.1007/BF02396074
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DOI: https://doi.org/10.1007/BF02396074