Journal ArticleDOI
A quantitative demonstration of the grain boundary diffusion mechanism for the oxidation of metals
TLDR
In this article, the authors report measurements of the oxide scale thickness and oxide grain size as a function of time during the oxidation of high-purity nickel in the temperature range 500-800°C.Abstract:
Below 1000°C the oxidation of nickel cannot be controlled by the diffusion of ions through the bulk crystal lattice of the pure oxide, because the measured oxidation rates are several orders of magnitude faster than would be predicted on this basis. Short-circuit diffusion through oxide grain boundaries or dislocations has usually been held responsible, but there has hitherto been no proper quantitative confirmation of this mechanism. We report measurements of the oxide scale thickness and oxide grain size as a function of time during the oxidation of high-purity nickel in the temperature range 500–800°C. All the oxidation experiments were carried out in pure oxygen at a pressure of one atmosphere. The measured parabolic oxidation rate constants have been compared with those calculated from grain boundary diffusion data obtained in our previous work, using a grain boundary diffusion model for the oxidation process. The quantitative agreement between measured and calculated oxidation rates shows c...read more
Citations
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Prediction of two-dimensional bismuth-based chalcogenides Bi2X3(X = S, Se, Te) monolayers with orthorhombic structure: a first-principles study
Asadollah Bafekry,M. Faraji,Mohamed M. Fadlallah,Hamad Rahman Jappor,Nguyen N. Hieu,M. Ghergherehchi,Seyed Amir Hossein Feghhi,Daniela Gogova +7 more
Journal ArticleDOI
First-principles calculations of the structural, mechanical, electronic and bonding properties of (CrB2)n CrAl with n = 1, 2, 3
Xiao-Hong Li,Xiao-Hong Li,Xiao-Hong Li,Mauricio Chagas da Silva,Dennis R. Salahub,Dennis R. Salahub +5 more
TL;DR: In this paper, the crystal structure, the electronic structure and the mechanical properties were investigated for (CrB2)nCrAl with n = 1, 2, 3 by using the all-electron projector augmented wave method with the Perdew-Burke Ernzerhof functional.
Journal ArticleDOI
An investigation of oxidation effects on hysteresis heating of nickel particles
TL;DR: In this paper, the authors investigated the oxidation kinetics of nickel particles with approximate diameters of 79 nm, 0.7 micron and 3 micron, at temperatures between 250°C and 350°C in air.
Journal ArticleDOI
Prediction study of the structural, elastic and high pressure properties of Yttrium chalcogenide
TL;DR: In this article, the authors used the fullpotential linearized augmented plane wave plus local orbitals method with the generalized gradient approximation for the exchange correlation potential (FP-APW + lo-GGA) to predict the structural, elastic and high pressure properties of polycrystalline YX with X = S, Se and Te.
Journal ArticleDOI
Structural, electronic and thermodynamic properties of BiF3-type Mg3Gd compound: A first-principle study
TL;DR: In this paper, first-principle calculations based on density functional theory are adopted to investigate the structural, electronic and thermodynamic properties of BiF 3 -type Mg 3 Gd compound.
References
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Journal ArticleDOI
Beitrag zur Theorie des Anlaufvorgangs
TL;DR: The Mechanismus des Diffusionsvorgangs is still weitgehend unbekannt as discussed by the authors, i.e., the Diffusion of mindestens einem der beiden Bestandteile durch die Anlaufschicht is notwendig.
Journal ArticleDOI
The diffusion of 63Ni along grain boundaries in nickel oxide
A. Atkinson,R. I. Taylor +1 more
TL;DR: The product of the grain boundary diffusion coefficient and width, D′δ, has been measured directly for the diffusion of 63Ni along grain boundaries in high-purity NiO as discussed by the authors.
Journal ArticleDOI
The role of oxide microstructure and growth stresses in the high-temperature scaling of nickel
F. N. Rhines,J. S. Wolf +1 more
TL;DR: In this article, the formation of new nickel oxide upon boundaries of columnar grains where nickel diffusing through the oxide crystals, meets oxygen, diffusing along grain boundaries is identified as the primary cause of this stress.
Journal ArticleDOI
The diffusion of Ni in the bulk and along dislocations in NiO single crystals
A. Atkinson,R. I. Taylor +1 more
TL;DR: In this paper, diffusion profiles of 63Ni tracer in single crystals of NiO following anneals at 522°-1000°C have been determined by a radio-frequency sputter-sectioning technique.
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