Structural and magnetic properties of nanocrystalline NiFeCuMo powders produced by wet mechanical alloying |
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Authors: | BV Neam?u O IsnardI Chicina? V Pop |
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Affiliation: | a Material Science and Technology Department, Technical University of Cluj-Napoca, 103-105 Muncii Ave., 400614 Cluj-Napoca, Romania b Institut Néel, CNRS, BP 166, University Joseph Fourier, 38042 Grenoble, Cédex 9, France c Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania |
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Abstract: | The NiFeCuMo nanocrystalline soft magnetic powders were successfully obtained by wet mechanical alloying route in a planetary ball mill using benzene (C6H6) as process control agent (PCA). The milling time used was ranging from 2 up to 20 h. The synthesis conditions and alloy formation have been investigated by X-ray and neutron diffraction as well as their influence on the intrinsic physical properties. Nanometer scale (≈10 nm) crystallites were obtained. A decrease of the samples magnetization has been observed and attributed to the stresses induced during the milling and to the benzene adsorbed on the powders surface. Differential scanning calorimetry investigation shows the presence of an exothermic peak related to the presence of benzene. The adsorbed benzene, internal stresses and crystalline defects removal took place during the heat treatment at 350 °C for 4 h, leading to an improvement of the powders magnetization. |
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Keywords: | Metals and alloys Nanostructured materials Mechanical alloying Magnetization Magnetic measurements X-ray diffraction |
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