First-principles calculations of the diffusion of atomic oxygen in nickel: thermal expansion contribution.
Identifieur interne : 000057 ( Ncbi/Curation ); précédent : 000056; suivant : 000058First-principles calculations of the diffusion of atomic oxygen in nickel: thermal expansion contribution.
Auteurs : E H Megchiche [Algérie] ; M. Amarouche ; C. MijouleSource :
- Journal of physics. Condensed matter : an Institute of Physics journal [ 0953-8984 ] ; 2007.
Abstract
Within the framework of density functional theory using the projector augmented-wave (PAW) method, we present some energetic properties of atomic oxygen interstitials in crystalline Ni, i.e. the insertion and activation energies of the O diffusion. Concerning the activation energy, two pathways for the migration process are studied. The charge transfer process between atomic oxygen and nickel atoms is analysed in the interstitial sites. We find that the interstitial octahedral site (O site) is lower in energy than the tetrahedral site (T site). The most favourable pathway for the migration between two octahedral sites corresponds to an intermediate metastable state located in a tetrahedral site. Concerning the charge transfers we find that the atomic oxygen ionizes as O(-) and that the electron migrates essentially from the Ni nearest neighbours of atomic oxygen. In addition, the thermal expansion contribution through the dilatation of the solid is studied. When the thermal expansion is introduced, we show that the insertion process is stabilized and that the tetrahedral insertion energy becomes nearly equal to the octahedral ones. However, the activation energy decreases with the dilatation. Taking into account the thermal expansion effects, our results are consistent with the more reliable experimental data.
DOI: 10.1088/0953-8984/19/29/296201
PubMed: 21483072
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Laboratoire de Physique et Chimie Quantique (LPCQ), Université Mouloud Mammeri, Tizi-Ouzou</wicri:regionArea><orgName type="university">Université Toulouse III - Paul Sabatier</orgName><placeName><settlement type="city">Toulouse</settlement><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region></placeName></affiliation></author><author><name sortKey="Amarouche, M" sort="Amarouche, M" uniqKey="Amarouche M" first="M" last="Amarouche">M. Amarouche</name></author><author><name sortKey="Mijoule, C" sort="Mijoule, C" uniqKey="Mijoule C" first="C" last="Mijoule">C. 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Laboratoire de Physique et Chimie Quantique (LPCQ), Université Mouloud Mammeri, Tizi-Ouzou, Algeria.</nlm:affiliation><country xml:lang="fr">Algérie</country><wicri:regionArea>Laboratoire de Physique Quantique, IRSAMC (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062, Toulouse Cedex 4, France. Laboratoire de Physique et Chimie Quantique (LPCQ), Université Mouloud Mammeri, Tizi-Ouzou</wicri:regionArea><orgName type="university">Université Toulouse III - Paul Sabatier</orgName><placeName><settlement type="city">Toulouse</settlement><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region></placeName></affiliation></author><author><name sortKey="Amarouche, M" sort="Amarouche, M" uniqKey="Amarouche M" first="M" last="Amarouche">M. Amarouche</name></author><author><name sortKey="Mijoule, C" sort="Mijoule, C" uniqKey="Mijoule C" first="C" last="Mijoule">C. Mijoule</name></author></analytic><series><title level="j">Journal of physics. Condensed matter : an Institute of Physics journal</title><idno type="ISSN">0953-8984</idno><imprint><date when="2007" type="published">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Within the framework of density functional theory using the projector augmented-wave (PAW) method, we present some energetic properties of atomic oxygen interstitials in crystalline Ni, i.e. the insertion and activation energies of the O diffusion. Concerning the activation energy, two pathways for the migration process are studied. The charge transfer process between atomic oxygen and nickel atoms is analysed in the interstitial sites. We find that the interstitial octahedral site (O site) is lower in energy than the tetrahedral site (T site). The most favourable pathway for the migration between two octahedral sites corresponds to an intermediate metastable state located in a tetrahedral site. Concerning the charge transfers we find that the atomic oxygen ionizes as O(-) and that the electron migrates essentially from the Ni nearest neighbours of atomic oxygen. In addition, the thermal expansion contribution through the dilatation of the solid is studied. When the thermal expansion is introduced, we show that the insertion process is stabilized and that the tetrahedral insertion energy becomes nearly equal to the octahedral ones. However, the activation energy decreases with the dilatation. Taking into account the thermal expansion effects, our results are consistent with the more reliable experimental data.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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