Characterization of nanocrystalline FeSiCr powders prepared by ball milling |
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Authors: | Z Bensebaa B Bouzabata A Djekoun JM Grenèche |
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Institution: | a Laboratoire de Magnétisme et de Spectroscopie des Solides (LM2S), Département de Physique, Faculté des Sciences, Université de Annaba, B.P. 12, 23000 Annaba, Algérie b Laboratoire de Recherche en Physico-chimie des Surfaces et Interfaces, Facultés des Sciences, Université de Skikda, B.P. 26, Elhadack, Skikda, Algérie c Laboratoire de Physique de l’Etat Condensé, UMR CNRS 6087, Université du Maine, 72085 Le Mans, France |
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Abstract: | FeSi10Cr10 powder was mechanically alloyed by high energy planetary ball milling, starting from elemental powders. The microstructural and magnetic properties of the milled powders were characterized by scanning electron microscopy, X-ray diffraction, 57Fe Mössbauer spectrometry and a vibratory sample magnetometer.After 3 h of milling, the formation of two bcc solid solutions α-Fe1 (Si, Cr) and α-Fe2 (Si, Cr) is observed. Their grain sizes decrease with increase in milling time attaining, at 15 h of milling, 23 and 11 nm, respectively. Mössbauer spectra of the milled powder show the presence of two components. One is a ferromagnetic type with a broad sextuplet. Its distribution of hyperfine field is characterized by high and low hyperfine field’s peaks and a mean value of 26.5 T. The other is a single paramagnetic peak. Its low concentration increases to ∼4% at 15 h of milling. These results can be explained by different atomic environments affected by Si or/and Cr elements, as well as the increased disordered grain boundaries.Magnetic measurements of the milled FeSi10Cr10 alloy powder exhibit a soft ferromagnetic character with a decrease of both magnetization at saturation (Ms) and coercive force (Hc) with milling time attaining values of Ms=151 emu/g and Hc=2500 A/m at 30 h of milling time. |
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Keywords: | Nanocrystalline material Mechanical alloying FeCrSi alloy X-ray diffraction 57Fe Mö ssbauer spectrometry Magnetic property |
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