CobaltMaghrebV1, France, Analysis, bibRecord, 000458

Diffusion du cobalt et du magnésium dans Ni1-δO monocristallin

Identifieur interne : 000458 ( France/Analysis ); précédent : 000457; suivant : 000459

Diffusion du cobalt et du magnésium dans Ni1-δO monocristallin

Auteurs : H. Boussetta [Tunisie] ; N. Tabet ; C. Monty [France]

Source :

Journal de physique. 3 : (Les Ulis) [ 1155-4320 ] ; 1992.

RBID : Pascal:92-0690350

Descripteurs français

Pascal (Inist)
- Etude expérimentale, Hétérodiffusion, Coefficient diffusion, Température, Haute température, Pression partielle, Lacune, Energie activation, Enthalpie, Composé minéral, Nickel Oxyde, Cobalt, Magnésium.
Wicri :
- topic : Composé minéral, Cobalt, Magnésium.

English descriptors

KwdEn :
- Activation energy, Cobalt, Diffusion coefficient, Enthalpy, Experimental study, High temperature, Impurity diffusion, Inorganic compound, Magnesium, Nickel Oxides, Partial pressure, Temperature, Vacancy.

Abstract

Co and Mg diffusion coefficients have been measured in NiO as a function of temperature at constant oxygen partial pressures p_o2=0.21 atm and 10^-4 atm and as a function of p_o2 at T=1 245^oC. The results are well represented by the relations: D_Mg(cm²s^-1)=1.45x10^-2p_O2 (atm)^0.172 exp [-2.58 (eV)/kT]; D_Co(cm²s^-1)=5. 5x10^-2p_O2 (atm)^0.175exp [-2.54 (eV)/kT]. Analyzing these results by comparison to nickel self-diffusion and to data on vacancy/impurity binding enthalpies, on correlation factors and on migration enthalpies, leads to a detailed analysis of the impurity/vacancy interaction. It shows that cobalt and magnesium interact rather tightly with V_Ni^'' during the exchange jumps and pratically no when they are in stable positions

Affiliations:

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

to stream PascalFrancis, to step Corpus: 000378
to stream PascalFrancis, to step Curation: 000325
to stream PascalFrancis, to step Checkpoint: 000373
to stream Main, to step Merge: 001412
to stream Main, to step Curation: 001359
to stream Main, to step Exploration: 001359
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Links to Exploration step

Pascal:92-0690350

Le document en format XML

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O monocristallin</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Activation energy</term>
<term>Cobalt</term>
<term>Diffusion coefficient</term>
<term>Enthalpy</term>
<term>Experimental study</term>
<term>High temperature</term>
<term>Impurity diffusion</term>
<term>Inorganic compound</term>
<term>Magnesium</term>
<term>Nickel Oxides</term>
<term>Partial pressure</term>
<term>Temperature</term>
<term>Vacancy</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term>
<term>Hétérodiffusion</term>
<term>Coefficient diffusion</term>
<term>Température</term>
<term>Haute température</term>
<term>Pression partielle</term>
<term>Lacune</term>
<term>Energie activation</term>
<term>Enthalpie</term>
<term>Composé minéral</term>
<term>Nickel Oxyde</term>
<term>Cobalt</term>
<term>Magnésium</term>
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<front><div type="abstract" xml:lang="en">Co and Mg diffusion coefficients have been measured in NiO as a function of temperature at constant oxygen partial pressures p<sub>o2</sub>
=0.21 atm and 10<sup>-4</sup>
 atm and as a function of p<sub>o2</sub>
 at T=1 245<sup>o</sup>
C. The results are well represented by the relations: D<sub>Mg</sub>
(cm<sup>2</sup>
s<sup>-1</sup>
)=1.45x10<sup>-2</sup>
p<sub>O2</sub>
 (atm)<sup>0.172</sup>
 exp [-2.58 (eV)/kT]; D<sub>Co</sub>
(cm<sup>2</sup>
s<sup>-1</sup>
)=5. 5x10<sup>-2</sup>
p<sub>O2</sub>
 (atm)<sup>0.175</sup>
exp [-2.54 (eV)/kT]. Analyzing these results by comparison to nickel self-diffusion and to data on vacancy/impurity binding enthalpies, on correlation factors and on migration enthalpies, leads to a detailed analysis of the impurity/vacancy interaction. It shows that cobalt and magnesium interact rather tightly with V<sub>Ni</sub>
<sup>''</sup>
 during the exchange jumps and pratically no when they are in stable positions</div>
</front>
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Diffusion du cobalt et du magnésium dans Ni1-δO monocristallin

Diffusion du cobalt et du magnésium dans Ni1-δO monocristallin

Source :

Descripteurs français

English descriptors

Abstract

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

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri