CobaltMaghrebV1, Main, Exploration, bibRecord, 000721

A-site deficiency effects on the structural and magnetic properties of La0.7Sr0.3-x□xCoO3 cobaltites

Identifieur interne : 000721 ( Main/Exploration ); précédent : 000720; suivant : 000722

A-site deficiency effects on the structural and magnetic properties of La0.7Sr0.3-x□xCoO3 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 ] ; 2009.

RBID : Pascal:09-0055184

Descripteurs français

Pascal (Inist)
- Moment magnétique, Réaction état solide, Composition chimique, Lacune, Effet thermomagnétique, Processus irréversible, Aimantation, Effet champ magnétique, Ordre longue distance, Point Curie, Verre spin, Cobalt Lanthane Strontium Oxyde Mixte, Etat spin, Réseau rhomboédrique, Matériau ferromagnétique, Cobaltite de lanthane et de strontium.

English descriptors

KwdEn :
- Chemical composition, Cobalt Lanthanum Strontium Oxides Mixed, Curie point, Ferromagnetic materials, Irreversible processes, Long-range order, Magnetic field effects, Magnetic moments, Magnetization, Solid state reaction, Spin glasses, Spin state, Thermomagnetic effects, Trigonal lattices, Vacancies.

Abstract

Structural and magnetic properties of La_0.7Sr_0.3-x□_xCoO₃ (0≤x≤0.15) samples have been investigated. Powder samples have been synthesized using the solid state reaction method at high temperature. All our samples crystallize in the rhombohedral structure with R3c space group. With increasing Sr-deficiency amount, the unit cell volume decreases from 341.4 Å³ (x=0) to 338.2 Å³ (x=0.15). Our samples exhibit thermo-magnetic irreversibility behavior in the magnetization data in a magnetic applied field of 50 mT, which indicates the absence of long range ferromagnetic order. The Curie temperature decreases from 225 K (x = 0) to 180 K (x=0.1). Sample with high deficient amount (x=0.15) becomes predominantly spin glass phase. The effective magnetic moments values obtained from the Curie constant are close to that of the Co³⁺ (intermediate spin configuration) and Co⁴⁺ (low spin configuration) for 0 < x ≤ 0.125 and Co³⁺ (low spin configuration) and Co⁴⁺ (low spin configuration) for x = 0.15.

Affiliations:

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Le document en format XML

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Sr<sub>0.3-x</sub>
□<sub>x</sub>
CoO<sub>3</sub>
 cobaltites</title>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">A-site deficiency effects on the structural and magnetic properties of La<sub>0.7</sub>
Sr<sub>0.3-x</sub>
□<sub>x</sub>
CoO<sub>3</sub>
 cobaltites</title>
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<series><title level="j" type="main">Journal of alloys and compounds</title>
<title level="j" type="abbreviated">J. alloys compd.</title>
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<imprint><date when="2009">2009</date>
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<term>Cobalt Lanthanum Strontium Oxides Mixed</term>
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<term>Ferromagnetic materials</term>
<term>Irreversible processes</term>
<term>Long-range order</term>
<term>Magnetic field effects</term>
<term>Magnetic moments</term>
<term>Magnetization</term>
<term>Solid state reaction</term>
<term>Spin glasses</term>
<term>Spin state</term>
<term>Thermomagnetic effects</term>
<term>Trigonal lattices</term>
<term>Vacancies</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Moment magnétique</term>
<term>Réaction état solide</term>
<term>Composition chimique</term>
<term>Lacune</term>
<term>Effet thermomagnétique</term>
<term>Processus irréversible</term>
<term>Aimantation</term>
<term>Effet champ magnétique</term>
<term>Ordre longue distance</term>
<term>Point Curie</term>
<term>Verre spin</term>
<term>Cobalt Lanthane Strontium Oxyde Mixte</term>
<term>Etat spin</term>
<term>Réseau rhomboédrique</term>
<term>Matériau ferromagnétique</term>
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<front><div type="abstract" xml:lang="en">Structural and magnetic properties of La<sub>0.7</sub>
Sr<sub>0.3-x</sub>
□<sub>x</sub>
CoO<sub>3</sub>
 (0≤x≤0.15) samples have been investigated. Powder samples have been synthesized using the solid state reaction method at high temperature. All our samples crystallize in the rhombohedral structure with R3c space group. With increasing Sr-deficiency amount, the unit cell volume decreases from 341.4 Å<sup>3</sup>
 (x=0) to 338.2 Å<sup>3</sup>
 (x=0.15). Our samples exhibit thermo-magnetic irreversibility behavior in the magnetization data in a magnetic applied field of 50 mT, which indicates the absence of long range ferromagnetic order. The Curie temperature decreases from 225 K (x = 0) to 180 K (x=0.1). Sample with high deficient amount (x=0.15) becomes predominantly spin glass phase. The effective magnetic moments values obtained from the Curie constant are close to that of the Co<sup>3+</sup>
 (intermediate spin configuration) and Co<sup>4+</sup>
 (low spin configuration) for 0 < x ≤ 0.125 and Co<sup>3+</sup>
 (low spin configuration) and Co<sup>4+</sup>
 (low spin configuration) for x = 0.15.</div>
</front>
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A-site deficiency effects on the structural and magnetic properties of La0.7Sr0.3-x□xCoO3 cobaltites

A-site deficiency effects on the structural and magnetic properties of La0.7Sr0.3-x□xCoO3 cobaltites

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

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Pour mettre un lien sur cette page dans le réseau Wicri