CobaltMaghrebV1, Main, Exploration, bibRecord, 000A64

Elaboration and characterization of glassy cobalt phosphomolybdates

Identifieur interne : 000A64 ( Main/Exploration ); précédent : 000A63; suivant : 000A65

Elaboration and characterization of glassy cobalt phosphomolybdates

Auteurs : N. Mouhsine [Maroc] ; L. Bih [Maroc] ; N. Allali [Maroc] ; A. Nadiri [Maroc] ; A. Yacoubi [Maroc] ; M. Haddad [Maroc] ; M. Danot [France]

Source :

Solid state sciences [ 1293-2558 ] ; 2003.

RBID : Pascal:03-0309436

Descripteurs français

Pascal (Inist)
- Etude expérimentale, Préparation chimique, Spectre IR, Spectre RPE, Structure état amorphe, Verre, Système ternaire, Cobalt oxyde, Molybdène oxyde, Phosphore oxyde, 6143F, Système CoO MoO3 P2O5, Co Mo O P, Cobalt phosphomolybdate.
Wicri :
- topic : Verre.

English descriptors

KwdEn :
- Amorphous state structure, Chemical preparation, Cobalt oxides, EPR spectra, Experimental study, Glass, Infrared spectra, Molybdenum oxides, Phosphorus oxides, Ternary systems.

Abstract

Selecting two series of P₂O₅-based oxide glasses containing at the same time the MoO₃ and CoO oxides, an investigation of structural properties has been undertaken by infrared (IR) and electron paramagnetic resonance (EPR) spectroscopies. The structure of glasses inside the CoO-MoO₃-P₂O₅ system may be considered as made of several types of molybdenum and phosphorous structural groups, the ratios of which depend on composition. The EPR spectra of Mo(V) ions are characterized by the large anisotropy of g- and A-tensors along the local z axis. The values of the covalency parameters k∥ and k⊥ determined for some glasses are correlated to the axial distortion of (Mo^VO₆) octahedron along the z axis. EPR spectra carried out at lower temperatures show additional broad line near g 4 and a narrow one at g 2. The former is attributed to the HS form of cobalt(II) in octahedral site. The latter is associated with LS electron configuration of Co²⁺ ions andlor Mo⁵⁺ centers. The existence of Co²⁺ in octahedral environment in both HS and LS forms is interpreted in term of a spin-crossover for Co(II) in these glasses.

Affiliations:

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Le document en format XML

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<author><name sortKey="Haddad, M" sort="Haddad, M" uniqKey="Haddad M" first="M." last="Haddad">M. Haddad</name>
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<sZ>6 aut.</sZ>
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<country>Maroc</country>
<wicri:noRegion>Beni M'hamed</wicri:noRegion>
</affiliation>
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<author><name sortKey="Danot, M" sort="Danot, M" uniqKey="Danot M" first="M." last="Danot">M. Danot</name>
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<series><title level="j" type="main">Solid state sciences</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Amorphous state structure</term>
<term>Chemical preparation</term>
<term>Cobalt oxides</term>
<term>EPR spectra</term>
<term>Experimental study</term>
<term>Glass</term>
<term>Infrared spectra</term>
<term>Molybdenum oxides</term>
<term>Phosphorus oxides</term>
<term>Ternary systems</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term>
<term>Préparation chimique</term>
<term>Spectre IR</term>
<term>Spectre RPE</term>
<term>Structure état amorphe</term>
<term>Verre</term>
<term>Système ternaire</term>
<term>Cobalt oxyde</term>
<term>Molybdène oxyde</term>
<term>Phosphore oxyde</term>
<term>6143F</term>
<term>Système CoO MoO3 P2O5</term>
<term>Co Mo O P</term>
<term>Cobalt phosphomolybdate</term>
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<front><div type="abstract" xml:lang="en">Selecting two series of P<sub>2</sub>
O<sub>5</sub>
-based oxide glasses containing at the same time the MoO<sub>3</sub>
 and CoO oxides, an investigation of structural properties has been undertaken by infrared (IR) and electron paramagnetic resonance (EPR) spectroscopies. The structure of glasses inside the CoO-MoO<sub>3</sub>
-P<sub>2</sub>
O<sub>5</sub>
 system may be considered as made of several types of molybdenum and phosphorous structural groups, the ratios of which depend on composition. The EPR spectra of Mo(V) ions are characterized by the large anisotropy of g- and A-tensors along the local z axis. The values of the covalency parameters k∥ and k⊥ determined for some glasses are correlated to the axial distortion of (Mo<sup>V</sup>
O<sub>6</sub>
) octahedron along the z axis. EPR spectra carried out at lower temperatures show additional broad line near g  4 and a narrow one at g  2. The former is attributed to the HS form of cobalt(II) in octahedral site. The latter is associated with LS electron configuration of Co<sup>2+</sup>
 ions andlor Mo<sup>5+</sup>
 centers. The existence of Co<sup>2+</sup>
 in octahedral environment in both HS and LS forms is interpreted in term of a spin-crossover for Co(II) in these glasses.</div>
</front>
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<name sortKey="Bih, L" sort="Bih, L" uniqKey="Bih L" first="L." last="Bih">L. Bih</name>
<name sortKey="Haddad, M" sort="Haddad, M" uniqKey="Haddad M" first="M." last="Haddad">M. Haddad</name>
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<country name="France"><region name="Pays de la Loire"><name sortKey="Danot, M" sort="Danot, M" uniqKey="Danot M" first="M." last="Danot">M. Danot</name>
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Elaboration and characterization of glassy cobalt phosphomolybdates

Elaboration and characterization of glassy cobalt phosphomolybdates

Source :

Descripteurs français

English descriptors

Abstract

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

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri