CobaltMaghrebV1, PascalFrancis, Curation, bibRecord, 000165

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

Identifieur interne : 000165 ( PascalFrancis/Curation ); précédent : 000164; suivant : 000166

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.

A01	`01`	`1`		`@0 0925-8388`
A03		`1`		`@0 J. alloys compd.`
A05				`@2 457`
A06				`@2 1-2`
A08	`01`	`1`	`ENG`	`@1 Structure and magnetism in deficient La_0.7-x□_xSr_0.3CoO₃ (0 ≤ x ≤ 0.2) perovskite cobaltites`
A11	`01`	`1`		`@1 BEN AMOR (A.)`
A11	`02`	`1`		`@1 KOUBAA (M.)`
A11	`03`	`1`		`@1 CHEIKHROUHOU-KOUBAA (W.)`
A11	`04`	`1`		`@1 CHEIKHROUHOU (A.)`
A14	`01`			`@1 Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, B.P. 802 @2 Sfax @3 TUN @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 4 aut.`
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A21				`@1 2008`
A23	`01`			`@0 ENG`
A43	`01`			`@1 INIST @2 1151 @5 354000173775410050`
A44				`@0 0000 @1 © 2008 INIST-CNRS. All rights reserved.`
A45				`@0 22 ref.`
A47	`01`	`1`		`@0 08-0248023`
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A61				`@0 A`
A64	`01`	`1`		`@0 Journal of alloys and compounds`
A66	`01`			`@0 CHE`
C01	`01`		`ENG`	@0 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.
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C02	`02`	`3`		`@0 001B70E30K`
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C03	`01`	`3`	`FRE`	`@0 Composition chimique @5 02`
C03	`01`	`3`	`ENG`	`@0 Chemical composition @5 02`
C03	`02`	`X`	`FRE`	`@0 Valence mixte @5 03`
C03	`02`	`X`	`ENG`	`@0 Mixed valence @5 03`
C03	`02`	`X`	`SPA`	`@0 Valencia mixta @5 03`
C03	`03`	`3`	`FRE`	`@0 Diffraction RX @5 04`
C03	`03`	`3`	`ENG`	`@0 XRD @5 04`
C03	`04`	`X`	`FRE`	`@0 Réaction état solide @5 05`
C03	`04`	`X`	`ENG`	`@0 Solid state reaction @5 05`
C03	`04`	`X`	`SPA`	`@0 Reacción estado sólido @5 05`
C03	`05`	`3`	`FRE`	`@0 Aimantation @5 06`
C03	`05`	`3`	`ENG`	`@0 Magnetization @5 06`
C03	`06`	`3`	`FRE`	`@0 Compensation charge @5 08`
C03	`06`	`3`	`ENG`	`@0 Charge compensation @5 08`
C03	`07`	`3`	`FRE`	`@0 Lacune @5 09`
C03	`07`	`3`	`ENG`	`@0 Vacancies @5 09`
C03	`08`	`X`	`FRE`	`@0 Cobalt Lanthane Strontium Oxyde Mixte @2 NC @2 NA @5 11`
C03	`08`	`X`	`ENG`	`@0 Cobalt Lanthanum Strontium Oxides Mixed @2 NC @2 NA @5 11`
C03	`08`	`X`	`SPA`	`@0 Mixto @2 NC @2 NA @5 11`
C03	`09`	`3`	`FRE`	`@0 Transition ferromagnétique paramagnétique @5 12`
C03	`09`	`3`	`ENG`	`@0 Ferromagnetic-paramagnetic transitions @5 12`
C03	`10`	`3`	`FRE`	`@0 Effet température @5 13`
C03	`10`	`3`	`ENG`	`@0 Temperature effects @5 13`
C03	`11`	`3`	`FRE`	`@0 Point Curie @5 14`
C03	`11`	`3`	`ENG`	`@0 Curie point @5 14`
C03	`12`	`3`	`FRE`	`@0 Perovskites @5 15`
C03	`12`	`3`	`ENG`	`@0 Perovskites @5 15`
C03	`13`	`3`	`FRE`	`@0 Réseau rhomboédrique @5 17`
C03	`13`	`3`	`ENG`	`@0 Trigonal lattices @5 17`
C03	`14`	`3`	`FRE`	`@0 Cobaltite @4 INC @5 63`
N21				`@1 162`

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Le document en format XML

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CoO<sub>3</sub>
 (0 ≤ x ≤ 0.2) perovskite cobaltites</title>
<author><name sortKey="Ben Amor, A" sort="Ben Amor, A" uniqKey="Ben Amor A" first="A." last="Ben Amor">A. Ben Amor</name>
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<author><name sortKey="Koubaa, M" sort="Koubaa, M" uniqKey="Koubaa M" first="M." last="Koubaa">M. Koubaa</name>
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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>
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<keywords scheme="Pascal" xml:lang="fr"><term>Composition chimique</term>
<term>Valence mixte</term>
<term>Diffraction RX</term>
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<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>
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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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CoO<sub>3</sub>
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<sZ>2 aut.</sZ>
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<fC01 i1="01" l="ENG"><s0>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.</s0>
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<s5>08</s5>
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<s5>09</s5>
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<fC03 i1="08" i2="X" l="FRE"><s0>Cobalt Lanthane Strontium Oxyde Mixte</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>11</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Cobalt Lanthanum Strontium Oxides Mixed</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>11</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Mixto</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>11</s5>
</fC03>
<fC03 i1="09" i2="3" l="FRE"><s0>Transition ferromagnétique paramagnétique</s0>
<s5>12</s5>
</fC03>
<fC03 i1="09" i2="3" l="ENG"><s0>Ferromagnetic-paramagnetic transitions</s0>
<s5>12</s5>
</fC03>
<fC03 i1="10" i2="3" l="FRE"><s0>Effet température</s0>
<s5>13</s5>
</fC03>
<fC03 i1="10" i2="3" l="ENG"><s0>Temperature effects</s0>
<s5>13</s5>
</fC03>
<fC03 i1="11" i2="3" l="FRE"><s0>Point Curie</s0>
<s5>14</s5>
</fC03>
<fC03 i1="11" i2="3" l="ENG"><s0>Curie point</s0>
<s5>14</s5>
</fC03>
<fC03 i1="12" i2="3" l="FRE"><s0>Perovskites</s0>
<s5>15</s5>
</fC03>
<fC03 i1="12" i2="3" l="ENG"><s0>Perovskites</s0>
<s5>15</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE"><s0>Réseau rhomboédrique</s0>
<s5>17</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG"><s0>Trigonal lattices</s0>
<s5>17</s5>
</fC03>
<fC03 i1="14" i2="3" l="FRE"><s0>Cobaltite</s0>
<s4>INC</s4>
<s5>63</s5>
</fC03>
<fN21><s1>162</s1>
</fN21>
</pA>
</standard>
</inist>
</record>

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	Serveur d'exploration sur le cobalt au Maghreb
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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

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