Structural and magnetic properties of Co50Ni50 powder mixtures
Identifieur interne : 000545 ( Main/Exploration ); précédent : 000544; suivant : 000546Structural and magnetic properties of Co50Ni50 powder mixtures
Auteurs : N. Loudjani [Algérie] ; N. Bensebaa [Algérie] ; L. Dekhil [Algérie] ; S. Alleg [Algérie] ; J. J. Sunol [Espagne]Source :
- Journal of magnetism and magnetic materials [ 0304-8853 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Paramètre cristallin, Alliage mécanique, Broyeur satellite, Broyeur boulet, Microscopie électronique balayage, Diffraction RX, Calorimétrie différentielle balayage, Force coercitive, Aimantation saturation, Dimension particule, Transformation allotropique, Relation fabrication propriété, Hystérésis magnétique, Nanocristal, Réseau cubique face centrée, Réseau hexagonal compact, Nickel alliage, Cobalt alliage, Métal transition alliage.
English descriptors
- KwdEn :
- Allotropic transformation, Ball mill, Cobalt alloys, Coercive force, Differential scanning calorimetry, FCC lattices, Fabrication property relation, HCP lattices, Lattice parameters, Magnetic hysteresis, Mechanical alloying, Nanocrystal, Nickel alloys, Particle size, Planetary mill, Saturation magnetization, Scanning electron microscopy, Transition element alloys, XRD.
Abstract
In the present work, morphological, structural, thermal and magnetic properties of nanocrystalline Co50Ni50 alloy prepared by high energy planetary ball milling have been studied by means of scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry. The coercivity and the saturation magnetization of alloyed powders were measured at room temperature by a vibration sample magnetization. Morphological observations indicated a narrow distribution in the particle and homogeneous shape form with mean average particle size around 130 μm2. The results show that an allotropic Co transformation hcp→fcc occurs within the three first hours of milling and contrary to what expected, the Rietveld refinement method reveals the formation of two fcc solid solutions (SS): fcc Co(Ni) and Ni(Co) beside a small amount of the undissolved Co hcp. Thermal measurement, as a function of milling time was carried out to confirm the existence of the hcp phase and to estimate its amount. Magnetic measurement indicated that the 48 h milled powders with a steady state particles size have the highest saturation (105.3 emu/g) and the lowest coercivity (34.5 Oe).
Affiliations:
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Loudjani</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Magnétisme et Spectroscopie des solides, Département de Physique, Faculté des Sciences, Université Badji Mokhtar, B.P. 12</s1><s2>23000 Annaba</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>23000 Annaba</wicri:noRegion></affiliation></author><author><name sortKey="Bensebaa, N" sort="Bensebaa, N" uniqKey="Bensebaa N" first="N." last="Bensebaa">N. Bensebaa</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Magnétisme et Spectroscopie des solides, Département de Physique, Faculté des Sciences, Université Badji Mokhtar, B.P. 12</s1><s2>23000 Annaba</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>23000 Annaba</wicri:noRegion></affiliation></author><author><name sortKey="Dekhil, L" sort="Dekhil, L" uniqKey="Dekhil L" first="L." last="Dekhil">L. Dekhil</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Magnétisme et Spectroscopie des solides, Département de Physique, Faculté des Sciences, Université Badji Mokhtar, B.P. 12</s1><s2>23000 Annaba</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>23000 Annaba</wicri:noRegion></affiliation></author><author><name sortKey="Alleg, S" sort="Alleg, S" uniqKey="Alleg S" first="S." last="Alleg">S. Alleg</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Magnétisme et Spectroscopie des solides, Département de Physique, Faculté des Sciences, Université Badji Mokhtar, B.P. 12</s1><s2>23000 Annaba</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>23000 Annaba</wicri:noRegion></affiliation></author><author><name sortKey="Sunol, J J" sort="Sunol, J J" uniqKey="Sunol J" first="J. J." last="Sunol">J. J. Sunol</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Dep. de Fisica, Universitat de Girona, Campus Montilivi</s1><s2>Girona 17071</s2><s3>ESP</s3><sZ>5 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Catalogne</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of magnetism and magnetic materials</title><title level="j" type="abbreviated">J. magn. magn. mater.</title><idno type="ISSN">0304-8853</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of magnetism and magnetic materials</title><title level="j" type="abbreviated">J. magn. magn. mater.</title><idno type="ISSN">0304-8853</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Allotropic transformation</term><term>Ball mill</term><term>Cobalt alloys</term><term>Coercive force</term><term>Differential scanning calorimetry</term><term>FCC lattices</term><term>Fabrication property relation</term><term>HCP lattices</term><term>Lattice parameters</term><term>Magnetic hysteresis</term><term>Mechanical alloying</term><term>Nanocrystal</term><term>Nickel alloys</term><term>Particle size</term><term>Planetary mill</term><term>Saturation magnetization</term><term>Scanning electron microscopy</term><term>Transition element alloys</term><term>XRD</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Paramètre cristallin</term><term>Alliage mécanique</term><term>Broyeur satellite</term><term>Broyeur boulet</term><term>Microscopie électronique balayage</term><term>Diffraction RX</term><term>Calorimétrie différentielle balayage</term><term>Force coercitive</term><term>Aimantation saturation</term><term>Dimension particule</term><term>Transformation allotropique</term><term>Relation fabrication propriété</term><term>Hystérésis magnétique</term><term>Nanocristal</term><term>Réseau cubique face centrée</term><term>Réseau hexagonal compact</term><term>Nickel alliage</term><term>Cobalt alliage</term><term>Métal transition alliage</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In the present work, morphological, structural, thermal and magnetic properties of nanocrystalline Co<sub>50</sub>Ni<sub>50</sub> alloy prepared by high energy planetary ball milling have been studied by means of scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry. The coercivity and the saturation magnetization of alloyed powders were measured at room temperature by a vibration sample magnetization. Morphological observations indicated a narrow distribution in the particle and homogeneous shape form with mean average particle size around 130 μm<sup>2</sup>. The results show that an allotropic Co transformation hcp→fcc occurs within the three first hours of milling and contrary to what expected, the Rietveld refinement method reveals the formation of two fcc solid solutions (SS): fcc Co(Ni) and Ni(Co) beside a small amount of the undissolved Co hcp. Thermal measurement, as a function of milling time was carried out to confirm the existence of the hcp phase and to estimate its amount. Magnetic measurement indicated that the 48 h milled powders with a steady state particles size have the highest saturation (105.3 emu/g) and the lowest coercivity (34.5 Oe).</div></front></TEI><affiliations><list><country><li>Algérie</li><li>Espagne</li></country><region><li>Catalogne</li></region></list><tree><country name="Algérie"><noRegion><name sortKey="Loudjani, N" sort="Loudjani, N" uniqKey="Loudjani N" first="N." last="Loudjani">N. Loudjani</name></noRegion><name sortKey="Alleg, S" sort="Alleg, S" uniqKey="Alleg S" first="S." last="Alleg">S. Alleg</name><name sortKey="Bensebaa, N" sort="Bensebaa, N" uniqKey="Bensebaa N" first="N." last="Bensebaa">N. Bensebaa</name><name sortKey="Dekhil, L" sort="Dekhil, L" uniqKey="Dekhil L" first="L." last="Dekhil">L. Dekhil</name></country><country name="Espagne"><region name="Catalogne"><name sortKey="Sunol, J J" sort="Sunol, J J" uniqKey="Sunol J" first="J. J." last="Sunol">J. J. 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