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First-principles calculations of the vacancy formation energy in nickel

Megchiche, El Hocine and Mijoule, Claude and Amarouche, Mohand and Barthelat, Jean-Claude First-principles calculations of the vacancy formation energy in nickel. (2006) Algerian Journal of Advanced Materials, vol. 81 (n° 3). pp. 81-86. ISSN 1111-625X

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Abstract

Within the framework of density functional theory, we investigate with the VASP code three key properties of a vacancy in crystalline nickel: the formation, migration and activation energy. We use Blochl's all-electron-like projector augmented wave method (PAW) to perform self-consistent total-energy structure calculations in the supercell approximation and pseudopotentials to describe the computationally expensive core-valence interaction. All calculations have been carried out using either the local spin density approximation (LSDA) or the generalized gradient approximations (GGA). In a first step we show that the inclusion of non local effects improves significantly the détermination of various well known experimental properties of the bulk (lattice parameter, magnetic moment, bulk modulus, cohesion energy ...). Thus, we conclude that the non local approach leads to a better estimation of vacancy formation (1.4 eV), migration (1.28 eV) and activation (2.65 eV) énergies at 0 K.

Item Type:Article
Additional Information:ISSN : 1111-625X/06/$18
Audience (journal):National peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université Mouloud Mammeri Tizi Ouzou - UMMTO (ALGERIA)
Laboratory name:
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Deposited By: Leila Abdelouhab
Deposited On:16 Sep 2011 09:37

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