CobaltMaghrebV1, Main, Exploration, bibRecord, 000782

Structure and magnetism in deficient La0.7-x□xSr0.3CoO3 (0 ≤ x ≤ 0.2) perovskite cobaltites

Identifieur interne : 000782 ( Main/Exploration ); précédent : 000781; suivant : 000783

Structure and magnetism in deficient La0.7-x□xSr0.3CoO3 (0 ≤ x ≤ 0.2) perovskite cobaltites

Auteurs : A. Ben Amor [Tunisie] ; M. Koubaa [Tunisie] ; W. Cheikhrouhou-Koubaa [Tunisie] ; A. Cheikhrouhou [Tunisie, France]

Source :

Journal of alloys and compounds [ 0925-8388 ] ; 2008.

RBID : Pascal:08-0248023

Descripteurs français

Pascal (Inist)
- Composition chimique, Valence mixte, Diffraction RX, Réaction état solide, Aimantation, Compensation charge, Lacune, Cobalt Lanthane Strontium Oxyde Mixte, Transition ferromagnétique paramagnétique, Effet température, Point Curie, Perovskites, Réseau rhomboédrique, Cobaltite.

English descriptors

KwdEn :
- Charge compensation, Chemical composition, Cobalt Lanthanum Strontium Oxides Mixed, Curie point, Ferromagnetic-paramagnetic transitions, Magnetization, Mixed valence, Perovskites, Solid state reaction, Temperature effects, Trigonal lattices, Vacancies, XRD.

Abstract

The lanthanum-deficient mixed valence cobaltites La_0.7-x□_xSr_0.3CoO₃ (0 ≤ x ≤ 0.2) have been elaborated and investigated by X-ray diffraction (XRD) and magnetic characterizations. All our samples have been synthesized by the solid state reaction method at high temperature. Redox titrations showed that all our samples are oxygen sub-stoichiometric. The oxygen sub-stoichiometry content increases with increasing lanthanum-deficient content. The charge compensation mechanism due to the lanthanum deficiency induces oxygen vacancy rather than Co³⁺ to Co⁴⁺ conversion. X-ray diffraction analysis using Rietveld refinement show that all our samples are single phase and crystallize in the rhombohedral structure with R3c space group. Lanthanum vacancy leads to a gradual decrease of the unit cell volume. Magnetic measurements show that all our deficient samples exhibit a paramagnetic to ferromagnetic transition with decreasing temperature. With increasing La-deficient amount, the Curie temperature T_C increases. A discrepancy between M(T) curves performed in field-cooled (FC) and zero-field-cooled (ZFC) modes has been observed at low temperature. Our results indicate that the higher the La-deficient amount the weaker the separation and the higher the magnetization.

Affiliations:

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Le document en format XML

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Sr<sub>0.3</sub>
CoO<sub>3</sub>
 (0 ≤ x ≤ 0.2) perovskite cobaltites</title>
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Sr<sub>0.3</sub>
CoO<sub>3</sub>
 (0 ≤ x ≤ 0.2) perovskite cobaltites</title>
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<series><title level="j" type="main">Journal of alloys and compounds</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Charge compensation</term>
<term>Chemical composition</term>
<term>Cobalt Lanthanum Strontium Oxides Mixed</term>
<term>Curie point</term>
<term>Ferromagnetic-paramagnetic transitions</term>
<term>Magnetization</term>
<term>Mixed valence</term>
<term>Perovskites</term>
<term>Solid state reaction</term>
<term>Temperature effects</term>
<term>Trigonal lattices</term>
<term>Vacancies</term>
<term>XRD</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Composition chimique</term>
<term>Valence mixte</term>
<term>Diffraction RX</term>
<term>Réaction état solide</term>
<term>Aimantation</term>
<term>Compensation charge</term>
<term>Lacune</term>
<term>Cobalt Lanthane Strontium Oxyde Mixte</term>
<term>Transition ferromagnétique paramagnétique</term>
<term>Effet température</term>
<term>Point Curie</term>
<term>Perovskites</term>
<term>Réseau rhomboédrique</term>
<term>Cobaltite</term>
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<front><div type="abstract" xml:lang="en">The lanthanum-deficient mixed valence cobaltites La<sub>0.7-x</sub>
□<sub>x</sub>
Sr<sub>0.3</sub>
CoO<sub>3</sub>
 (0 ≤ x ≤ 0.2) have been elaborated and investigated by X-ray diffraction (XRD) and magnetic characterizations. All our samples have been synthesized by the solid state reaction method at high temperature. Redox titrations showed that all our samples are oxygen sub-stoichiometric. The oxygen sub-stoichiometry content increases with increasing lanthanum-deficient content. The charge compensation mechanism due to the lanthanum deficiency induces oxygen vacancy rather than Co<sup>3+</sup>
 to Co<sup>4+</sup>
 conversion. X-ray diffraction analysis using Rietveld refinement show that all our samples are single phase and crystallize in the rhombohedral structure with R3c space group. Lanthanum vacancy leads to a gradual decrease of the unit cell volume. Magnetic measurements show that all our deficient samples exhibit a paramagnetic to ferromagnetic transition with decreasing temperature. With increasing La-deficient amount, the Curie temperature T<sub>C</sub>
 increases. A discrepancy between M(T) curves performed in field-cooled (FC) and zero-field-cooled (ZFC) modes has been observed at low temperature. Our results indicate that the higher the La-deficient amount the weaker the separation and the higher the magnetization.</div>
</front>
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Structure and magnetism in deficient La0.7-x□xSr0.3CoO3 (0 ≤ x ≤ 0.2) perovskite cobaltites

Structure and magnetism in deficient La0.7-x□xSr0.3CoO3 (0 ≤ x ≤ 0.2) perovskite cobaltites

Source :

Descripteurs français

English descriptors

Abstract

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