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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First Principles Investigation of the Elastic, Optoelectronic and Thermal Properties of XRuSb: (X = V, Nb, Ta) Semi-Heusler Compounds Using the mBJ Exchange Potential
K. Bencherif,A. Yakoubi,N. Della,O. Miloud Abid,Houari Khachai,Rashid Ahmed,Rabah Khenata,S. Bin Omran,Sanjeev K. Gupta,Ghulam Murtaza +9 more
TL;DR: In this article, the structural, electronic, elastic, thermal and optical properties of VRuSb, NbRuSb and TaSb semi-Heusler compounds were investigated using density functional theory.
Journal ArticleDOI
First-principle calculations to investigate the elastic and thermodynamic properties of RBRh 3 (R =Sc, y and La) perovskite compounds
TL;DR: In this article, the structural, elastic and thermodynamic properties of cubic perovskite RBRh3 compounds were investigated using the full-potential linear augmented plane wave (FP-LAPW) method within density functional theory.
Journal ArticleDOI
First-principles investigations on structural, elastic and electronic properties of SnO2 under pressure
TL;DR: In this paper, the structural, elastic, and electronic properties of rutile-type SnO2 were investigated by plane-wave pseudopotential density functional theory method, and the lattice constants, bulk modulus and its pressure derivative were all calculated.
Journal ArticleDOI
Elastic properties of perovskite-type hydride NaMgH3 for hydrogen storage
TL;DR: In this paper, the elastic constants of NaMgH3 were calculated for the first time and the linear bulk modulus along crystallographic axes of single crystals have been derived using elastic constants.
Journal ArticleDOI
Computational study of structural, elastic and electronic properties of lithium disilicate (Li(2)Si(2)O(5)) glass-ceramic.
TL;DR: The calculated structural properties namely the equilibrium lattice parameters and cell volume are in good agreement with the available experimental results, but for the LD crystal elastic moduli: Shear modulus G, Young's modulus E and Poisson's ratio ν there is a discrepancy between theoretical values and experimental results.
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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