Impurity diffusion of Ni in Co1− x O single crystals
Identifieur interne : 000510 ( France/Analysis ); précédent : 000509; suivant : 000511Impurity diffusion of Ni in Co1− x O single crystals
Auteurs : R. Gomri [France] ; H. Boussetta [France] ; C. Bahezre [France] ; C. Monty [France]Source :
- Solid State Ionics [ 0167-2738 ] ; 1984.
Abstract
Nickel diffusion coefficients have been measured in cobalt oxide Co1−xO, under oxygen partial pressures of 0.21 atm and 1.5×10−5 atm in a large temperature range (1000–1600°C). NiO has been deposited as a thin film on the surface of CoO single crystals by rf sputtering. Concentration-penetration curves have been obtained by electron beam microanalysis and by secondary ion mass spectrometry. The results can be described by the relations: DCoONi (cm2/s) = 2.78×10−2 exp (-2.02 eV/kT), PO2=0.21 atm; andDuCoONi (cm2/s)=1.22×10−2 exp (-2.15 eV/ kT), PO2=1.5×10−5 atm. We discuss these results and particularly the dependence on oxygen partial pressure. The PO2 exponent is smaller for impurity diffusion than for self-diffusion. This has been interpreted as evidence for an interaction between Ni atoms and doubly charged vacancies.
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DOI: 10.1016/0167-2738(84)90151-6
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NiO has been deposited as a thin film on the surface of CoO single crystals by rf sputtering. Concentration-penetration curves have been obtained by electron beam microanalysis and by secondary ion mass spectrometry. The results can be described by the relations: DCoONi (cm2/s) = 2.78×10−2 exp (-2.02 eV/kT), PO2=0.21 atm; andDuCoONi (cm2/s)=1.22×10−2 exp (-2.15 eV/ kT), PO2=1.5×10−5 atm. We discuss these results and particularly the dependence on oxygen partial pressure. The PO2 exponent is smaller for impurity diffusion than for self-diffusion. This has been interpreted as evidence for an interaction between Ni atoms and doubly charged vacancies.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Île-de-France</li></region><settlement><li>Meudon</li></settlement></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Gomri, R" sort="Gomri, R" uniqKey="Gomri R" first="R." last="Gomri">R. 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