Interfacial reaction of NiO with Al2O3(112̄0) and polycrystalline α-Al2O3
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Cited by (15)
Influence of NiAl<inf>2</inf>O<inf>4</inf> spinel formation on the oxidation behavior of the Ni50Al alloy at 1273 K in air
2019, Surface and Coatings TechnologyCitation Excerpt :In the NiO/Al2O3 system, the interdiffusion of Ni2+ and Al3+ was found to occur much faster in NiO/γ-Al2O3 than in NiO/α-Al2O3 samples [34]. Because of its much higher grain boundary density, its ‘‘defect spinel structure’’, which closely resembled the structure of the reaction product, and its thermodynamic metastability, γ-Al2O3 was expected to react faster to aluminates than α-Al2O3 [34,35]. The thicknesses of the oxide scales were measured using the cross-sectional images in Fig. 6 and change in the oxide scales' thickness compared against the oxidation time is shown in Fig. 9.
Hydrogen from synthetic biogas by catalyzed MDR and SIP: Screening of catalyst and iron oxide mixtures
2015, FuelCitation Excerpt :Also, the interaction between metal and support produces loss of active phase, as in the formation of NiAl2O4 in catalyst of nickel supported on γ-Al2O3 [18]. A proposal for working out this issue consists of producing a layer of nickel aluminate between the support and the metal particle through double impregnation and calcination [19,20]. Another alternative involves the synthesis of a non-stoichiometric NiAl2O4.
Structure, surface morphology and electrical properties of evaporated Ni thin films: Effect of substrates, thickness and Cu underlayer
2014, Thin Solid FilmsCitation Excerpt :It seems that the appearance of these kinds of grains is due to the crystalline structure of the substrate (Al2O3) which has a rhomboid structure. Similar observations were made by Bolt et al. [27] for Ni films (in the 35 to 100 nm thickness range) evaporated onto α-Al2O3. In Table 1.,
Reaction between NiO and Al <inf>2</inf> O <inf>3</inf> in NiO/γ-Al <inf>2</inf> O <inf>3</inf> catalysts probed by positronium atom
2013, Applied Surface ScienceCitation Excerpt :This indicates that the reaction is not complete. Reaction between NiO and γ-Al2O3 has also been reported by several other researchers [7,8,18,19]. Positron lifetime spectra were measured for NiO/γ-Al2O3 catalysts with NiO content of 9 wt% and 24 wt% together with a pure γ-Al2O3.