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Title of Journal: J Supercond Nov Magn

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Abbravation: Journal of Superconductivity and Novel Magnetism

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Springer US

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DOI

10.1016/0009-2614(88)80405-6

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1557-1947

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Structural Thermal and Magnetic Properties of Nan

Authors: N Loudjani M Benchiheub M Bououdina
Publish Date: 2016/05/11
Volume: 29, Issue: 11, Pages: 2717-2726
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Abstract

Co80Ni20 powder mixture was mechanically alloyed by highenergy planetary ball milling starting from elemental Co and Ni metal powders The morphological microstructural thermal and magnetic properties of the milled powders were characterised respectively by scanning electron microscopy Xray diffraction differential scanning calorimetry and vibratory sample magnetometry In addition to a highly disordered phase two facecentred cubic FCC and hexagonal closepacked HCP solid solutions FCC CoNi FCC NiCo and HCP CoNi are observed after 3 h of milling Their grain sizes decrease with increase in milling time attaining at 48 h of milling 12 nm 25 nm and 10 nm respectively Beyond a certain milling time no further refinement of the microstructure occurs and the morphological equilibrium is usually given by a bimodal particle size distribution Magnetic measurements of the milled Co80Ni20 alloy powder exhibit a soft ferromagnetic character where the magnetic parameters are sensitive to the milling time mainly due to the particle size refinement as well as the formation of CoNi and NiCo solid solutions Both the saturation magnetisation M s and coercivity H c were found to decrease with milling time attaining the values of M s = 126 emu/g and H c = 60 Oe after 48 h of milling

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