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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Journal ArticleDOI
Systematic study of optoelectronic and transport properties of cesium lead halide (Cs2PbX6; X=Cl, Br, I) double perovskites for solar cell applications
Journal ArticleDOI
Diffusion induced recrystallization of NiO
T.A. Parthasarathy,Paul Shewmon +1 more
TL;DR: In this article, it was shown that changing the composition of a sample of NiO from that in equilibrium with air at 1200°C to one that is equilibrium with oxygen saturated Ni at 800-900°C will recrystallize the surface to a much finer grain size.
Journal ArticleDOI
Cr5Si3B and Hf5Si3B: New MAB phases with anisotropic electrical, mechanical properties and damage tolerance
TL;DR: In this paper, a combination of electronic structure, chemical bonding and mechanical property investigations, anisotropic electrical and mechanical properties, and damage tolerant ability of MAB phases Cr 5 Si 3 B and Hf 5 Si3 B were predicted.
Journal ArticleDOI
Elastic properties and indentation cracking behavior of Na2O-TiO2-SiO2 glasses
TL;DR: In this article, the effects of composition on indentation deformation and cracking behavior of Na2O-TiO2-SiO2 glasses were studied in the light of structural considerations and parameters such as the atomic packing density (Cg) and the network energy, using a combination of elastic measurements and micro-hardness indentation experiments.
Journal ArticleDOI
Structural, mechanical, thermal, and optical properties of inverse-Heusler alloys Cr2CoZ (Z = Al, In): A first-principles investigation
Md. Rasheduzzaman,Khandaker Monower Hossain,S.K. Mitro,M. A. Hadi,Jibon Krishna Modak,Md. Zahid Hasan +5 more
TL;DR: In this paper, the structural, mechanical, thermal, and optical properties of Cr2CoZ (Z = Al, In) inverse-Heuslers for the first time using density functional theory were investigated.
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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