Magnetic properties of Cofe1.9RE0.1O4 nanoparticles (RE = La, Ce, Nd, Sm, Eu, Gd, Tb, Ho) prepared in polyol
Identifieur interne : 000149 ( France/Analysis ); précédent : 000148; suivant : 000150Magnetic 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.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Highly crystalline Cofe1.9RE0.1O4 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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Pascal:08-0518493Le document en format XML
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RE<sub>0.1</sub>
O<sub>4</sub>
nanoparticles (RE = La, Ce, Nd, Sm, Eu, Gd, Tb, Ho) prepared in polyol</title>
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<author><name sortKey="Greneche, J M" sort="Greneche, J M" uniqKey="Greneche J" first="J.-M." last="Greneche">J.-M. Greneche</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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<series><title level="j" type="main">Journal of magnetism and magnetic materials</title>
<title level="j" type="abbreviated">J. magn. magn. mater.</title>
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<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>
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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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<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="Villain, F" sort="Villain, F" uniqKey="Villain F" first="F." last="Villain">F. Villain</name>
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