Serveur d'exploration sur le cobalt au Maghreb

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Magnetic approach in some mixed Cobalt (II) hydroxynitrates compounds

Identifieur interne : 000945 ( Main/Exploration ); précédent : 000944; suivant : 000946

Magnetic approach in some mixed Cobalt (II) hydroxynitrates compounds

Auteurs : N. Izaoumen [Maroc] ; M. Cherrab [Maroc] ; K. Rissouli [Maroc] ; K. Benkhouja [Maroc] ; K. Jaafari [Maroc] ; M. Fahad [Maroc]

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RBID : Pascal:05-0188394

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English descriptors

Abstract

Among layered compounds, the transition metal hydroxynitrates M(OH)2-x(NO3)x.nH2O (with M= Co, Ni,Cu) are still currently investigated, since they are good precursors for the synthesis of simple or mixed metal oxides with interesting catalytic and electronic properties.From a structural point of view, the hydroxynitrates derive from the CdI2 type stucture of M (OH)2. They can be described as 2D triangular arrays of metal ions with large interplanar distances, and accordingly, they are good candidates for studying bidimensional magnetic systems. Knowing that from a magnetic point view, Co(OH)2 and Co2(OH)3(NO3) were shown to be a genuine examples of layered ferromagnetic systems, with the occurrence of 3d antiferromagnetic order at nearly the same temperature ; we report in this paper the preparation and magnetic properties of layered cobat mixed metal(II) hydroxynitrates CoM(OH)3(NO3) (M= Cu, Ba) hydrated or no which display, according to the metal ion, either ferro or antiferromagnetic interlayer interactions. We discuss the interest in these compounds named hybrid organic-inorganic compounds for the stabilizing ferromagnetic interactions.


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<term>Antiferromagnetism</term>
<term>Cobalt Hydroxides nitrates</term>
<term>Copper Hydroxides nitrates</term>
<term>Exchange interactions</term>
<term>Ferromagnetism</term>
<term>Hydrates</term>
<term>Layered crystals</term>
<term>Magnetic ordering</term>
<term>Magnetic properties</term>
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<term>Interaction échange</term>
<term>Ferromagnétisme</term>
<term>Hydrate</term>
<term>Cobalt Hydroxynitrate</term>
<term>Cristal lamellaire</term>
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<div type="abstract" xml:lang="en">Among layered compounds, the transition metal hydroxynitrates M(OH)
<sub>2-x</sub>
(NO
<sub>3</sub>
)
<sub>x</sub>
.nH
<sub>2</sub>
O (with M= Co, Ni,Cu) are still currently investigated, since they are good precursors for the synthesis of simple or mixed metal oxides with interesting catalytic and electronic properties.From a structural point of view, the hydroxynitrates derive from the CdI
<sub>2</sub>
type stucture of M (OH)
<sub>2</sub>
. They can be described as 2D triangular arrays of metal ions with large interplanar distances, and accordingly, they are good candidates for studying bidimensional magnetic systems. Knowing that from a magnetic point view, Co(OH)
<sub>2</sub>
and Co
<sub>2</sub>
(OH)
<sub>3</sub>
(NO
<sub>3</sub>
) were shown to be a genuine examples of layered ferromagnetic systems, with the occurrence of 3d antiferromagnetic order at nearly the same temperature ; we report in this paper the preparation and magnetic properties of layered cobat mixed metal(II) hydroxynitrates CoM(OH)
<sub>3</sub>
(NO
<sub>3</sub>
) (M= Cu, Ba) hydrated or no which display, according to the metal ion, either ferro or antiferromagnetic interlayer interactions. We discuss the interest in these compounds named hybrid organic-inorganic compounds for the stabilizing ferromagnetic interactions.</div>
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