High Magnetic Moment of FeCo Nanoparticles Produced in Polyol Medium
Identifieur interne : 000196 ( Main/Exploration ); précédent : 000195; suivant : 000197High Magnetic Moment of FeCo Nanoparticles Produced in Polyol Medium
Auteurs : Karim Zehani [France] ; Riadh Bez [France, Tunisie] ; Jacques Moscovici [France] ; Frédéric Mazaleyrat [France] ; Najeh Mliki [Tunisie] ; Lotfi Bessais [France]Source :
- IEEE transactions on magnetics [ 0018-9464 ] ; 2014.
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Abstract
High magnetization Fe55Co45 alloy nanoparticles have been successfully synthesized by the polyol reduction process followed by annealing under argon. The diethylene glycol was used as solvent and reducing agent simultaneously in this process. All the synthesized samples of FeCo nanoparticles were annealed at 873 K for different times. The alloy formation processes, the evolution of the microstructure, and the magnetic properties have been investigated before and after samples annealing. The X-ray diffraction (XRD) of the synthesized product before annealing shows that a cobalt ferrite is spinel structure of crystallite size of about 10 nm. XRD analysis of the samples annealed at 873 K for different times also shows that of the FeCo alloy has been obtained by reducing the cobalt ferrite. It has been confirmed that the formation of a body-centered cubic (bcc) single-phase structure where the wt% increases with annealing times leading to a pure phase after annealing during 4 h. These results are confirmed by transmission electron microscopy study. The saturation magnetization of the Fe-Co alloys increases with annealing time, indicating an increasing homogeneity in composition and the single bcc FeCo phase formation. The highest saturation magnetization of 235 Am2 .kg-1 with a low coercivity of 7.5 mT was obtained for the Fe55Co45 nanoparticles annealed during 4 h. The anisotropy constant K has been extracted and we have shown that increases with the annealing time.
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El Manar</orgName><placeName><settlement type="city">Tunis</settlement><region type="region" nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Moscovici, Jacques" sort="Moscovici, Jacques" uniqKey="Moscovici J" first="Jacques" last="Moscovici">Jacques Moscovici</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>CMTR, Department of M2I, ICMPE, Université Paris Est Créteil</s1><s2>Thiais 94320</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region></placeName></affiliation></author><author><name sortKey="Mazaleyrat, Frederic" sort="Mazaleyrat, Frederic" uniqKey="Mazaleyrat F" first="Frédéric" last="Mazaleyrat">Frédéric Mazaleyrat</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>SATIE, ENS Cachan, CNRS</s1><s2>Cachan 94235</s2><s3>FRA</s3><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region></placeName></affiliation></author><author><name sortKey="Mliki, Najeh" sort="Mliki, Najeh" uniqKey="Mliki N" first="Najeh" last="Mliki">Najeh Mliki</name><affiliation wicri:level="4"><inist:fA14 i1="03"><s1>LMOP, Faculté des Sciences de Tunis, Université de Tunis El Manar</s1><s2>Tunis 2092</s2><s3>TUN</s3><sZ>2 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName><orgName type="university">Université de Tunis - El Manar</orgName><placeName><settlement type="city">Tunis</settlement><region type="region" nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Bessais, Lotfi" sort="Bessais, Lotfi" uniqKey="Bessais L" first="Lotfi" last="Bessais">Lotfi Bessais</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>CMTR, Department of M2I, ICMPE, Université Paris Est Créteil</s1><s2>Thiais 94320</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region></placeName></affiliation></author></analytic><series><title level="j" type="main">IEEE transactions on magnetics</title><title level="j" type="abbreviated">IEEE trans. magn.</title><idno type="ISSN">0018-9464</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">IEEE transactions on magnetics</title><title level="j" type="abbreviated">IEEE trans. magn.</title><idno type="ISSN">0018-9464</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Magnetic anisotropy</term><term>Magnetic moments</term><term>Magnetic properties</term><term>Microstructure</term><term>Nanoparticles</term><term>Synthesis</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Moment magnétique</term><term>Propriété magnétique</term><term>Nanoparticule</term><term>Anisotropie magnétique</term><term>Synthèse</term><term>Microstructure</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">High magnetization Fe<sub>55</sub>Co<sub>45</sub> alloy nanoparticles have been successfully synthesized by the polyol reduction process followed by annealing under argon. The diethylene glycol was used as solvent and reducing agent simultaneously in this process. All the synthesized samples of FeCo nanoparticles were annealed at 873 K for different times. The alloy formation processes, the evolution of the microstructure, and the magnetic properties have been investigated before and after samples annealing. The X-ray diffraction (XRD) of the synthesized product before annealing shows that a cobalt ferrite is spinel structure of crystallite size of about 10 nm. XRD analysis of the samples annealed at 873 K for different times also shows that of the FeCo alloy has been obtained by reducing the cobalt ferrite. It has been confirmed that the formation of a body-centered cubic (bcc) single-phase structure where the wt% increases with annealing times leading to a pure phase after annealing during 4 h. These results are confirmed by transmission electron microscopy study. The saturation magnetization of the Fe-Co alloys increases with annealing time, indicating an increasing homogeneity in composition and the single bcc FeCo phase formation. The highest saturation magnetization of 235 Am<sup>2</sup> .kg<sup>-1</sup> with a low coercivity of 7.5 mT was obtained for the Fe<sub>55</sub>Co<sub>45</sub> nanoparticles annealed during 4 h. The anisotropy constant K has been extracted and we have shown that increases with the annealing time.</div></front></TEI><affiliations><list><country><li>France</li><li>Tunisie</li></country><region><li>Gouvernorat de Tunis</li><li>Île-de-France</li></region><settlement><li>Tunis</li></settlement><orgName><li>Université de Tunis - El Manar</li></orgName></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Zehani, Karim" sort="Zehani, Karim" uniqKey="Zehani K" first="Karim" last="Zehani">Karim Zehani</name></region><name sortKey="Bessais, Lotfi" sort="Bessais, Lotfi" uniqKey="Bessais L" first="Lotfi" last="Bessais">Lotfi Bessais</name><name sortKey="Bez, Riadh" sort="Bez, Riadh" uniqKey="Bez R" first="Riadh" last="Bez">Riadh Bez</name><name sortKey="Mazaleyrat, Frederic" sort="Mazaleyrat, Frederic" uniqKey="Mazaleyrat F" first="Frédéric" last="Mazaleyrat">Frédéric Mazaleyrat</name><name sortKey="Moscovici, Jacques" sort="Moscovici, Jacques" uniqKey="Moscovici J" first="Jacques" last="Moscovici">Jacques Moscovici</name></country><country name="Tunisie"><region name="Gouvernorat de Tunis"><name sortKey="Bez, Riadh" sort="Bez, Riadh" uniqKey="Bez R" first="Riadh" last="Bez">Riadh Bez</name></region><name sortKey="Mliki, Najeh" sort="Mliki, Najeh" uniqKey="Mliki N" first="Najeh" last="Mliki">Najeh Mliki</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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