CobaltMaghrebV1, Main, Exploration, bibRecord, 000787

Magnetic properties of Cofe1.9RE0.1O4 nanoparticles (RE = La, Ce, Nd, Sm, Eu, Gd, Tb, Ho) prepared in polyol

Identifieur interne : 000787 ( Main/Exploration ); précédent : 000786; suivant : 000788

Magnetic properties of Cofe1.9RE0.1O4 nanoparticles (RE = La, Ce, Nd, Sm, Eu, Gd, Tb, Ho) prepared in polyol

Auteurs : L. Ben Tahar [Tunisie] ; M. Artus [France] ; S. Ammar [France] ; L. S. Smiri [Tunisie] ; F. Herbst [France] ; M.-J. Vaulay [France] ; V. Richard [France] ; J.-M. Greneche [France] ; F. Villain [France] ; F. Fievet [France]

Source :

Journal of magnetism and magnetic materials [ 0304-8853 ] ; 2008.

RBID : Pascal:08-0518493

Descripteurs français

Pascal (Inist)
- Propriété magnétique, Composition chimique, Diffraction RX, Microscopie électronique transmission, Spectre perte énergie électron, Effet Mössbauer, Spectre absorption RX, Substitution ion, Microstructure, Fer Cobalt Lanthanide Oxyde Mixte, Nanoparticule, Ferrites, Particule magnétique.

English descriptors

KwdEn :
- Chemical composition, Electron energy loss spectra, Ferrites, Ion substitution, Iron Cobalt Rare earths Oxides Mixed, Magnetic particles, Magnetic properties, Microstructure, Moessbauer effect, Nanoparticles, Transmission electron microscopy, X-ray absorption spectra, XRD.

Abstract

Highly crystalline Cofe_1.9RE_0.1O₄ ferrite nanoparticles, where RE = La, Ce, Nd, Sm, Eu, Gd, Tb, and Ho, have been synthesized by forced hydrolysis in polyol. X-ray diffraction (XRD), transmission electron microscopy (TEM), electron energy-loss spectroscopy (EELS), ⁵⁷ Fe Mossbauer spectrometry, Co K-edge X-ray absorption spectroscopy and magnetic measurements using a SQUID magnetometer were employed to investigate the effect of the substitution RE³⁺ ions for Fe³⁺ ones on the structure, the microstructure, the chemical homogeneity, and the magnetic properties of the cobalt ferrite system. All the produced particles are superparamagnetic at room temperature. Nevertheless, the substitution causes reduction of the blocking temperature which is mainly ascribed to partial cation exchange among the spinel-like sublattices of CoFe₂O₄ induced by the insertion of the relatively large RE³⁺ ions. The low-temperature saturation magnetization and coercivity appear to be greatly affected by the nature of RE³⁺ ions-maxima values were found for Gd³⁺ and Eu³⁺, respectively.

Affiliations:

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Le document en format XML

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 nanoparticles (RE = La, Ce, Nd, Sm, Eu, Gd, Tb, Ho) prepared in polyol</title>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Magnetic properties of Cofe<sub>1.9</sub>
RE<sub>0.1</sub>
O<sub>4</sub>
 nanoparticles (RE = La, Ce, Nd, Sm, Eu, Gd, Tb, Ho) prepared in polyol</title>
<author><name sortKey="Ben Tahar, L" sort="Ben Tahar, L" uniqKey="Ben Tahar L" first="L." last="Ben Tahar">L. Ben Tahar</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Unité de Recherche 99/UR12-30, Faculté des Sciences de Bizerte</s1>
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<author><name sortKey="Smiri, L S" sort="Smiri, L S" uniqKey="Smiri L" first="L. S." last="Smiri">L. S. Smiri</name>
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<author><name sortKey="Herbst, F" sort="Herbst, F" uniqKey="Herbst F" first="F." last="Herbst">F. Herbst</name>
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<author><name sortKey="Vaulay, M J" sort="Vaulay, M J" uniqKey="Vaulay M" first="M.-J." last="Vaulay">M.-J. Vaulay</name>
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<author><name sortKey="Villain, F" sort="Villain, F" uniqKey="Villain F" first="F." last="Villain">F. Villain</name>
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<s2>75251 Paris</s2>
<s3>FRA</s3>
<sZ>9 aut.</sZ>
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<placeName><region type="region" nuts="2">Île-de-France</region>
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</placeName>
</affiliation>
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<author><name sortKey="Fievet, F" sort="Fievet, F" uniqKey="Fievet F" first="F." last="Fievet">F. Fievet</name>
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<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>
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</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Chemical composition</term>
<term>Electron energy loss spectra</term>
<term>Ferrites</term>
<term>Ion substitution</term>
<term>Iron Cobalt Rare earths Oxides Mixed</term>
<term>Magnetic particles</term>
<term>Magnetic properties</term>
<term>Microstructure</term>
<term>Moessbauer effect</term>
<term>Nanoparticles</term>
<term>Transmission electron microscopy</term>
<term>X-ray absorption spectra</term>
<term>XRD</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Propriété magnétique</term>
<term>Composition chimique</term>
<term>Diffraction RX</term>
<term>Microscopie électronique transmission</term>
<term>Spectre perte énergie électron</term>
<term>Effet Mössbauer</term>
<term>Spectre absorption RX</term>
<term>Substitution ion</term>
<term>Microstructure</term>
<term>Fer Cobalt Lanthanide Oxyde Mixte</term>
<term>Nanoparticule</term>
<term>Ferrites</term>
<term>Particule magnétique</term>
</keywords>
</textClass>
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<front><div type="abstract" xml:lang="en">Highly crystalline Cofe<sub>1.9</sub>
RE<sub>0.1</sub>
O<sub>4</sub>
 ferrite nanoparticles, where RE = La, Ce, Nd, Sm, Eu, Gd, Tb, and Ho, have been synthesized by forced hydrolysis in polyol. X-ray diffraction (XRD), transmission electron microscopy (TEM), electron energy-loss spectroscopy (EELS), <sup>57</sup>
 Fe Mossbauer spectrometry, Co K-edge X-ray absorption spectroscopy and magnetic measurements using a SQUID magnetometer were employed to investigate the effect of the substitution RE<sup>3+</sup>
 ions for Fe<sup>3+</sup>
 ones on the structure, the microstructure, the chemical homogeneity, and the magnetic properties of the cobalt ferrite system. All the produced particles are superparamagnetic at room temperature. Nevertheless, the substitution causes reduction of the blocking temperature which is mainly ascribed to partial cation exchange among the spinel-like sublattices of CoFe<sub>2</sub>
O<sub>4</sub>
 induced by the insertion of the relatively large RE<sup>3+</sup>
 ions. The low-temperature saturation magnetization and coercivity appear to be greatly affected by the nature of RE<sup>3+</sup>
 ions-maxima values were found for Gd<sup>3+</sup>
 and Eu<sup>3+</sup>
, respectively.</div>
</front>
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<li>Tunisie</li>
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<region><li>Pays de la Loire</li>
<li>Île-de-France</li>
</region>
<settlement><li>Le Mans</li>
<li>Paris</li>
<li>Villetaneuse</li>
</settlement>
<orgName><li>Université du Maine</li>
</orgName>
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<tree><country name="Tunisie"><noRegion><name sortKey="Ben Tahar, L" sort="Ben Tahar, L" uniqKey="Ben Tahar L" first="L." last="Ben Tahar">L. Ben Tahar</name>
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<name sortKey="Smiri, L S" sort="Smiri, L S" uniqKey="Smiri L" first="L. S." last="Smiri">L. S. Smiri</name>
</country>
<country name="France"><region name="Île-de-France"><name sortKey="Artus, M" sort="Artus, M" uniqKey="Artus M" first="M." last="Artus">M. Artus</name>
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<name sortKey="Ammar, S" sort="Ammar, S" uniqKey="Ammar S" first="S." last="Ammar">S. Ammar</name>
<name sortKey="Fievet, F" sort="Fievet, F" uniqKey="Fievet F" first="F." last="Fievet">F. Fievet</name>
<name sortKey="Greneche, J M" sort="Greneche, J M" uniqKey="Greneche J" first="J.-M." last="Greneche">J.-M. Greneche</name>
<name sortKey="Herbst, F" sort="Herbst, F" uniqKey="Herbst F" first="F." last="Herbst">F. Herbst</name>
<name sortKey="Richard, V" sort="Richard, V" uniqKey="Richard V" first="V." last="Richard">V. Richard</name>
<name sortKey="Vaulay, M J" sort="Vaulay, M J" uniqKey="Vaulay M" first="M.-J." last="Vaulay">M.-J. Vaulay</name>
<name sortKey="Villain, F" sort="Villain, F" uniqKey="Villain F" first="F." last="Villain">F. Villain</name>
</country>
</tree>
</affiliations>
</record>

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Magnetic properties of Cofe1.9RE0.1O4 nanoparticles (RE = La, Ce, Nd, Sm, Eu, Gd, Tb, Ho) prepared in polyol

Magnetic properties of Cofe1.9RE0.1O4 nanoparticles (RE = La, Ce, Nd, Sm, Eu, Gd, Tb, Ho) prepared in polyol

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