Magnetic and structural studies of mechanically alloyed (Fe50Co50)62Nb8B30 powder mixtures |
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| Authors: | S Alleg S Azzaza R Bensalem JJ Suol S Khene G Fillion |
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| Affiliation: | aLaboratoire de Magnétisme et Spectroscopie des Solides, Département de Physique, Faculté des Sciences, Université de Annaba, B.P. 12, 23000 Annaba, Algeria;bDep. de Fisica, Universitat de Girona, Campus Montilivi, Girona 17071, Spain;cDépartement de Physique, Université de Annaba, B.P. 12, 23000 Annaba, Algeria;dDépartement Nano, Institut Néel, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, France |
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| Abstract: | Amorphous (Fe50Co50)62Nb8B30 powder mixture was prepared by mechanical alloying from elemental Fe, Co, B and Nb powders in a planetary ball mill under argon atmosphere. Structural, thermal and magnetic properties were performed on the milled powders by means of X-ray diffraction, differential scanning calorimetry and magnetic measurements. The amorphous state is reached after 125 h of milling. The excess enthalpy due to the high density of defects is released at temperature below 300 °C. Crystallisation and growth of crystal domains are the dominating processes at high temperatures. The saturation magnetisation decreases rapidly during the first 25 h of milling to about 15.24 A m2/kg and remains nearly constant on further milling. Coercivity, Hc, value of about 160 Oe is obtained after 125 h of milling. |
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| Keywords: | Nanostructured materials Mechanical alloying Amorphization Magnetic measurements Calorimetry X-ray diffraction |
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