CobaltMaghrebV1, France, Analysis, bibRecord, 000152

Effects of sodium doping on physical properties of La0.75Sr0.25-xNaxCoO3 (0≤X≤0.2) cobaltites

Identifieur interne : 000152 ( France/Analysis ); précédent : 000151; suivant : 000153

Effects of sodium doping on physical properties of La0.75Sr0.25-xNaxCoO3 (0≤X≤0.2) cobaltites

Auteurs : M. Koubaa [Tunisie] ; W. Cheikhrouhou-Koubaa [Tunisie] ; A. Cheikhrouhou [Tunisie, France] ; L. Ranno [France]

Source :

Physica. B, Condensed matter [ 0921-4526 ] ; 2008.

RBID : Pascal:09-0024147

Descripteurs français

Pascal (Inist)
- Composition chimique, Effet thermomagnétique, Effet magnétocalorique, Réaction état solide, Transition ferromagnétique paramagnétique, Diffraction RX, Transition métal semiconducteur, Longueur liaison, Angle liaison, Fluctuation spin, Double échange, Amas magnétique, Cobalt Lanthane Sodium Strontium Oxyde Mixte, Réseau rhomboédrique, Semiconducteur, Matériau ferromagnétique, Cobaltite.

English descriptors

KwdEn :
- Bond angle, Bond lengths, Chemical composition, Cobalt Lanthanum Sodium Strontium Oxides Mixed, Double exchange, Ferromagnetic materials, Ferromagnetic-paramagnetic transitions, Magnetic cluster, Magnetocaloric effects, Semiconductor materials, Semiconductor metal transition, Solid state reaction, Spin fluctuations, Thermomagnetic effects, Trigonal lattices, XRD.

Abstract

The effects of Na doping on the crystallographic, magnetic, electrical and magnetocaloric properties of La_0.75Sr_0.25-xNa_xCoO₃ (0≤X≤0.2) samples, elaborated using the solid-state reaction method at high temperature, have been investigated. X-ray powder diffraction studies reveal that all our synthesized samples crystallize in the rhombohedral structure (R3c space group). Na substitution leads to an enhancement of the Co-O bond length and a reduction in the Co-O-Co bond angle and consequently to a weakening of the double exchange interaction between Co³⁺ and Co⁴⁺ ions. The zero field cooled (ZFC) and field cooled (FC) magnetization curves at 50 mT show thermomagnetic irreversibility. At low temperatures, with increasing Na amount, the samples change from ferromagnetic-like behavior (x = 0, 0.05 and 0.1) to spin-glass one (X=0.15 and 0.2). The ferromagnetic-paramagnetic transition temperature decreases with increasing Na amount from 235 to 200 K (x = 0.1). The critical exponent value, associated to the spontaneous magnetization, increases with increasing Na amount from 0.37 for x = 0 to 0.57 for x = 0.1. The temperature dependence of the electrical resistivity reveals three different regimes as a function of Na content: (i) for x = 0, a metallic behavior is observed in the whole temperature range, (ii) for x = 0.05, a metal-semiconducting transition is observed around 80 K and (iii) for x≥0.1, we observe a semiconducting behavior in the whole temperature range. The parent compound (x = 0) exhibits a maximum entropy change |ΔS^MAX_M| of 0.84 J kg^-1 K^-1 at 220 K in a magnetic applied field of2T. |ΔS^MAX_M| decreases to 0.47 J kg^-1 K^-1 at 185 K forx = 0.1 in the same field magnitude. Well above Tc, |ΔS^MAX_M| shows a linear dependence as a function of H² indicating the existence of spin fluctuations inside ferromagnetic clusters.

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Le document en format XML

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Sr<sub>0.25-x</sub>
Na<sub>x</sub>
CoO<sub>3</sub>
 (0≤X≤0.2) cobaltites</title>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Effects of sodium doping on physical properties of La<sub>0.75</sub>
Sr<sub>0.25-x</sub>
Na<sub>x</sub>
CoO<sub>3</sub>
 (0≤X≤0.2) cobaltites</title>
<author><name sortKey="Koubaa, M" sort="Koubaa, M" uniqKey="Koubaa M" first="M." last="Koubaa">M. Koubaa</name>
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<affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Institut NEEL, CNRS, B.P.166</s1>
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<series><title level="j" type="main">Physica. B, Condensed matter</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bond angle</term>
<term>Bond lengths</term>
<term>Chemical composition</term>
<term>Cobalt Lanthanum Sodium Strontium Oxides Mixed</term>
<term>Double exchange</term>
<term>Ferromagnetic materials</term>
<term>Ferromagnetic-paramagnetic transitions</term>
<term>Magnetic cluster</term>
<term>Magnetocaloric effects</term>
<term>Semiconductor materials</term>
<term>Semiconductor metal transition</term>
<term>Solid state reaction</term>
<term>Spin fluctuations</term>
<term>Thermomagnetic effects</term>
<term>Trigonal lattices</term>
<term>XRD</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Composition chimique</term>
<term>Effet thermomagnétique</term>
<term>Effet magnétocalorique</term>
<term>Réaction état solide</term>
<term>Transition ferromagnétique paramagnétique</term>
<term>Diffraction RX</term>
<term>Transition métal semiconducteur</term>
<term>Longueur liaison</term>
<term>Angle liaison</term>
<term>Fluctuation spin</term>
<term>Double échange</term>
<term>Amas magnétique</term>
<term>Cobalt Lanthane Sodium Strontium Oxyde Mixte</term>
<term>Réseau rhomboédrique</term>
<term>Semiconducteur</term>
<term>Matériau ferromagnétique</term>
<term>Cobaltite</term>
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<front><div type="abstract" xml:lang="en">The effects of Na doping on the crystallographic, magnetic, electrical and magnetocaloric properties of La<sub>0.75</sub>
Sr<sub>0.25-x</sub>
Na<sub>x</sub>
CoO<sub>3</sub>
 (0≤X≤0.2) samples, elaborated using the solid-state reaction method at high temperature, have been investigated. X-ray powder diffraction studies reveal that all our synthesized samples crystallize in the rhombohedral structure (R3c space group). Na substitution leads to an enhancement of the Co-O bond length and a reduction in the Co-O-Co bond angle and consequently to a weakening of the double exchange interaction between Co<sup>3+</sup>
 and Co<sup>4+</sup>
 ions. The zero field cooled (ZFC) and field cooled (FC) magnetization curves at 50 mT show thermomagnetic irreversibility. At low temperatures, with increasing Na amount, the samples change from ferromagnetic-like behavior (x = 0, 0.05 and 0.1) to spin-glass one (X=0.15 and 0.2). The ferromagnetic-paramagnetic transition temperature decreases with increasing Na amount from 235 to 200 K (x = 0.1). The critical exponent value, associated to the spontaneous magnetization, increases with increasing Na amount from 0.37 for x = 0 to 0.57 for x = 0.1. The temperature dependence of the electrical resistivity reveals three different regimes as a function of Na content: (i) for x = 0, a metallic behavior is observed in the whole temperature range, (ii) for x = 0.05, a metal-semiconducting transition is observed around 80 K and (iii) for x≥0.1, we observe a semiconducting behavior in the whole temperature range. The parent compound (x = 0) exhibits a maximum entropy change |ΔS<sup>MAX</sup>
<sub>M</sub>
| of 0.84 J kg<sup>-1</sup>
 K<sup>-1</sup>
 at 220 K in a magnetic applied field of2T. |ΔS<sup>MAX</sup>
<sub>M</sub>
| decreases to 0.47 J kg<sup>-1</sup>
 K<sup>-1</sup>
 at 185 K forx = 0.1 in the same field magnitude. Well above Tc, |ΔS<sup>MAX</sup>
<sub>M</sub>
| shows a linear dependence as a function of H<sup>2</sup>
 indicating the existence of spin fluctuations inside ferromagnetic clusters.</div>
</front>
</TEI>
<affiliations><list><country><li>France</li>
<li>Tunisie</li>
</country>
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<li>Rhône-Alpes</li>
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</region>
<name sortKey="Ranno, L" sort="Ranno, L" uniqKey="Ranno L" first="L." last="Ranno">L. Ranno</name>
</country>
</tree>
</affiliations>
</record>

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Effects of sodium doping on physical properties of La0.75Sr0.25-xNaxCoO3 (0≤X≤0.2) cobaltites

Effects of sodium doping on physical properties of La0.75Sr0.25-xNaxCoO3 (0≤X≤0.2) cobaltites

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Descripteurs français

English descriptors

Abstract

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Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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