Serveur d'exploration sur le cobalt au Maghreb

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Structural, magnetic, and electronic properties of high moment FeCo nanoparticles

Identifieur interne : 000003 ( PascalFrancis/Checkpoint ); précédent : 000002; suivant : 000004

Structural, magnetic, and electronic properties of high moment FeCo nanoparticles

Auteurs : K. Zehani [France] ; R. Bez [France, Tunisie] ; A. Boutahar [Maroc] ; E. K. Hlil [France] ; H. Lassri [Maroc] ; J. Moscovici [France] ; N. Mliki [Tunisie] ; L. Bessais [France]

Source :

RBID : Pascal:14-0168622

Descripteurs français

English descriptors

Abstract

Soft-magnetic Fe55Co45 alloy nanoparticles have been successfully synthesized by the polyol reduction process followed by annealing under argon. The diethylene glycol (DEG) was used as solvent and reducing agent simultaneously in this process. The synthesized samples of nanoparticles were annealed at 873 K for different times. The alloy formation processes, the evolution of the microstructure, the magnetic properties, and the DOS calculation have been investigated before and after samples annealing. The X-ray diffraction of the synthesized product before annealing shows that a cobalt ferrite is spinel structure of crystallite size of about 10 nm. X-ray diffraction 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 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 emu g-1with a low coercivity of 76 Oe was obtained for the Fe55Co45nanoparticles annealed during 4 h. The local random anisotropy constant KL has been extracted. This work presents also detailed information about total, and atom projected density of state functions, as well as the magnetic moment for different atoms in Fe55Co45 alloys and cobalt ferrite.


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<term>Microstructure</term>
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<div type="abstract" xml:lang="en">Soft-magnetic 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 (DEG) was used as solvent and reducing agent simultaneously in this process. The synthesized samples of nanoparticles were annealed at 873 K for different times. The alloy formation processes, the evolution of the microstructure, the magnetic properties, and the DOS calculation have been investigated before and after samples annealing. The X-ray diffraction of the synthesized product before annealing shows that a cobalt ferrite is spinel structure of crystallite size of about 10 nm. X-ray diffraction 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 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 emu g
<sup>-1</sup>
with a low coercivity of 76 Oe was obtained for the Fe
<sub>55</sub>
Co
<sub>45</sub>
nanoparticles annealed during 4 h. The local random anisotropy constant K
<sub>L</sub>
has been extracted. This work presents also detailed information about total, and atom projected density of state functions, as well as the magnetic moment for different atoms in Fe
<sub>55</sub>
Co
<sub>45</sub>
alloys and cobalt ferrite.</div>
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Co
<sub>45</sub>
alloy nanoparticles have been successfully synthesized by the polyol reduction process followed by annealing under argon. The diethylene glycol (DEG) was used as solvent and reducing agent simultaneously in this process. The synthesized samples of nanoparticles were annealed at 873 K for different times. The alloy formation processes, the evolution of the microstructure, the magnetic properties, and the DOS calculation have been investigated before and after samples annealing. The X-ray diffraction of the synthesized product before annealing shows that a cobalt ferrite is spinel structure of crystallite size of about 10 nm. X-ray diffraction 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 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 emu g
<sup>-1</sup>
with a low coercivity of 76 Oe was obtained for the Fe
<sub>55</sub>
Co
<sub>45</sub>
nanoparticles annealed during 4 h. The local random anisotropy constant K
<sub>L</sub>
has been extracted. This work presents also detailed information about total, and atom projected density of state functions, as well as the magnetic moment for different atoms in Fe
<sub>55</sub>
Co
<sub>45</sub>
alloys and cobalt ferrite.</s0>
</fC01>
<fC02 i1="01" i2="3">
<s0>001B70C22</s0>
</fC02>
<fC02 i1="02" i2="3">
<s0>001B80A16</s0>
</fC02>
<fC02 i1="03" i2="3">
<s0>001B80A20</s0>
</fC02>
<fC03 i1="01" i2="3" l="FRE">
<s0>Moment magnétique</s0>
<s5>02</s5>
</fC03>
<fC03 i1="01" i2="3" l="ENG">
<s0>Magnetic moments</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="3" l="FRE">
<s0>Densité état électron</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="3" l="ENG">
<s0>Electronic density of states</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="3" l="FRE">
<s0>Recuit</s0>
<s5>04</s5>
</fC03>
<fC03 i1="03" i2="3" l="ENG">
<s0>Annealing</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="3" l="FRE">
<s0>Microstructure</s0>
<s5>05</s5>
</fC03>
<fC03 i1="04" i2="3" l="ENG">
<s0>Microstructure</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE">
<s0>Synthèse nanomatériau</s0>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG">
<s0>Nanomaterial synthesis</s0>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA">
<s0>Síntesis nanomaterial</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE">
<s0>Synthèse chimique</s0>
<s5>07</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG">
<s0>Chemical synthesis</s0>
<s5>07</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA">
<s0>Síntesis química</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE">
<s0>Aimantation saturation</s0>
<s5>09</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG">
<s0>Saturation magnetization</s0>
<s5>09</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA">
<s0>Imanación saturación</s0>
<s5>09</s5>
</fC03>
<fC03 i1="08" i2="3" l="FRE">
<s0>Force coercitive</s0>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="3" l="ENG">
<s0>Coercive force</s0>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="3" l="FRE">
<s0>Nanoparticule</s0>
<s5>15</s5>
</fC03>
<fC03 i1="09" i2="3" l="ENG">
<s0>Nanoparticles</s0>
<s5>15</s5>
</fC03>
<fC03 i1="10" i2="3" l="FRE">
<s0>Matériau magnétique doux</s0>
<s5>16</s5>
</fC03>
<fC03 i1="10" i2="3" l="ENG">
<s0>Soft magnetic materials</s0>
<s5>16</s5>
</fC03>
<fC03 i1="11" i2="3" l="FRE">
<s0>Fer alliage</s0>
<s5>17</s5>
</fC03>
<fC03 i1="11" i2="3" l="ENG">
<s0>Iron alloys</s0>
<s5>17</s5>
</fC03>
<fC03 i1="12" i2="3" l="FRE">
<s0>Cobalt alliage</s0>
<s5>18</s5>
</fC03>
<fC03 i1="12" i2="3" l="ENG">
<s0>Cobalt alloys</s0>
<s5>18</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE">
<s0>Particule magnétique</s0>
<s5>19</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG">
<s0>Magnetic particles</s0>
<s5>19</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE">
<s0>Nanomatériau magnétique</s0>
<s5>20</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG">
<s0>Magnetic nanomaterial</s0>
<s5>20</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA">
<s0>Nanomaterial magnético</s0>
<s5>20</s5>
</fC03>
<fC03 i1="15" i2="3" l="FRE">
<s0>Métal transition alliage</s0>
<s5>48</s5>
</fC03>
<fC03 i1="15" i2="3" l="ENG">
<s0>Transition element alloys</s0>
<s5>48</s5>
</fC03>
<fN21>
<s1>209</s1>
</fN21>
</pA>
</standard>
</inist>
<affiliations>
<list>
<country>
<li>France</li>
<li>Maroc</li>
<li>Tunisie</li>
</country>
<region>
<li>Auvergne-Rhône-Alpes</li>
<li>Gouvernorat de Tunis</li>
<li>Rhône-Alpes</li>
<li>Île-de-France</li>
</region>
<settlement>
<li>Grenoble</li>
<li>Thiais</li>
<li>Tunis</li>
</settlement>
<orgName>
<li>Université Joseph Fourier</li>
<li>Université de Tunis - El Manar</li>
</orgName>
</list>
<tree>
<country name="France">
<region name="Île-de-France">
<name sortKey="Zehani, K" sort="Zehani, K" uniqKey="Zehani K" first="K." last="Zehani">K. Zehani</name>
</region>
<name sortKey="Bessais, L" sort="Bessais, L" uniqKey="Bessais L" first="L." last="Bessais">L. Bessais</name>
<name sortKey="Bez, R" sort="Bez, R" uniqKey="Bez R" first="R." last="Bez">R. Bez</name>
<name sortKey="Hlil, E K" sort="Hlil, E K" uniqKey="Hlil E" first="E. K." last="Hlil">E. K. Hlil</name>
<name sortKey="Moscovici, J" sort="Moscovici, J" uniqKey="Moscovici J" first="J." last="Moscovici">J. Moscovici</name>
</country>
<country name="Tunisie">
<region name="Gouvernorat de Tunis">
<name sortKey="Bez, R" sort="Bez, R" uniqKey="Bez R" first="R." last="Bez">R. Bez</name>
</region>
<name sortKey="Mliki, N" sort="Mliki, N" uniqKey="Mliki N" first="N." last="Mliki">N. Mliki</name>
</country>
<country name="Maroc">
<noRegion>
<name sortKey="Boutahar, A" sort="Boutahar, A" uniqKey="Boutahar A" first="A." last="Boutahar">A. Boutahar</name>
</noRegion>
<name sortKey="Lassri, H" sort="Lassri, H" uniqKey="Lassri H" first="H." last="Lassri">H. Lassri</name>
</country>
</tree>
</affiliations>
</record>

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