Showing papers on "Nickel published in 1976"
TL;DR: In this paper, two steps of the overall mechanism have been identified, namely, dissociation of CO and hydrogenation of deposited carbon by adsorbed hydrogen, and they have been studied on Ni and Ni-Cu alloy films at low pressures, at temperatures of 250-350 °C.
465 citations
TL;DR: Sebertia acuminata (Sapotaceae) from New Caledonia has been shown to be a hyperaccumulator of nickel, easily the highest nickel concentration ever found in living material.
Abstract: Sebertia acuminata (Sapotaceae) from New Caledonia has been shown to be a hyperaccumulator of nickel. The nickel content of the latex (25.74 percent on a dry weight basis) is easily the highest nickel concentration ever found in living material. The nickel is in the form of a low-molecular-weight, water-soluble organic complex.
377 citations
TL;DR: In this paper, a study of the chemistry involved in preparation, pretreatment, and reduction of Ni Al 2 O 3 catalysts was carried out using hydrogen chemisorption, thermal gravimetric analysis, and chromatographic analysis.
347 citations
324 citations
TL;DR: In this article, the theoretical basis for the two-band model with spin-mixing which has been widely applied to the analysis of the transport properties of ferromagnetic metals is discussed in detail.
Abstract: The theoretical basis for the two-band model with spin-mixing which has been widely applied to the analysis of the transport properties of ferromagnetic metals is discussed in detail. This model is shown to have much more general validity than the original presentation suggested. The model is then applied to resistivity data in Ni and Fe based alloys to obtain a consistent set of parameters for the scattering within each spin band for various impurities, together with temperature dependent pure metal scattering rates.
282 citations
TL;DR: In this article, the catalytic behavior of unsupported nickel and nickel dispersed on a variety of supports has been studied in the CO H 2 synthesis reaction, and the catalysts were characterized by chemisorption and X-ray diffraction measurements.
179 citations
TL;DR: In this paper, the electron-donor effects of boron and phosphorus are clearly seen for the first time; each atom of these metalloids gives ∼1.6 and 2.4 electrons, respectively, to the TM d bands.
Abstract: Continuously cast metallic glasses [METGLASR (trademark of the Allied Chemical Corporation) alloys] based on the transition metals (TM) iron, cobalt, and nickel can now be synthesized containing boron as the only metalloid. The different electron‐donor effects of boron and phosphorus are clearly seen for the first time; each atom of these metalloids gives ∼1.6 and 2.4 electrons, respectively, to the TM d bands. Extrapolation of the available magnetic moment data suggests a nonzero moment on nickel in (TM)80B20 glasses. The boron‐containing metallic glasses generally show higher Curie temperatures and room‐temperature saturation magnetizations than mixed‐metalloid glassy alloys of the same TM content.
161 citations
134 citations
TL;DR: Trans-Alkenylalanes, readily obtainable via hydroaluminiation of acetylenes, react readily with aryl bromides and iodides in the presence of catalytic amounts of nickel complexes, to produce arylated alkenes in high yields, the stereochemistry of the products being >99%trans.
Abstract: trans-Alkenylalanes, readily obtainable via hydroaluminiation of acetylenes, react readily with aryl bromides and iodides in the presence of catalytic amounts of nickel complexes, such as tetrakis(triphenylphosphine)- nickel, to produce arylated alkenes in high yields, the stereochemistry of the products being >99%trans.
125 citations
TL;DR: Nickel surfaces were prepared by a combination of high temperature oxidation, argon ion bombardment and hydrogen reduction as discussed by the authors, and the surface was found to chemisorb oxygen to produce a coverage of 0.014 micro g cm 2 in an ordered c(2 × 2) structure.
122 citations
TL;DR: In this paper, a calculation of the in-depth distribution of atomic concentration at the surface is presented on the basis of Palmberg's physical mechanism by utilizing the difference in escape length of the Auger electrons with different energies.
TL;DR: In this article, the effects of various transition metal additions on the sintering of a well-characterized, fine tungsten powder were analyzed using both isothermal and constant heating rate experiments in the temperature range 900 to 1400°C.
Abstract: The effects of various transition metal additions on the sintering of a well-characterized, fine tungsten powder were analyzed using both isothermal and constant heating rate experiments in the temperature range 900 to 1400°C. Approximately four atomic mono-layers of palladium on the tungsten powder surface were found to be the optimal enhancer, followed by nickel, cobalt, platinum, and iron. The addition of Cu to the tungsten had no appreciable effect on the sintering kinetics. Sintering enhancement by these transition metals is related to their periodic chart position (i.e., electron structure). An overall non-Arrhenius shrinkage temperature dependence is attributed to grain growth in the activator-treated specimens. The activation energy for tungsten densification was determined to be 430 to 450 kJ/mol, which is in general agreement with a grain boundary diffusion process.
TL;DR: In this paper, a liquid transition-metal theory is applied to the Ni-P alloys and the heat capacity results support the use of that theory and also show that a "sinking band" model is appropriate for this system.
TL;DR: In this paper, the adsorption of CO and CO 2 on platinum, nickel and copper was studied by X-ray and UV photoelectron spectroscopy, and the results indicated that CO 2 is physisorbed on platinum and copper and that the bonding of CO on all three metals involves the metal d-electrons and particularly the 5σ level of CO.
Patent•
27 Dec 1976
TL;DR: A class of amorphous metal alloys is provided in this paper in which the alloys are rich in iron, nickel, cobalt, chromium and/or manganese.
Abstract: A class of amorphous metal alloys is provided in which the alloys are rich in iron, nickel, cobalt, chromium and/or manganese. These alloys contain at least one element from each of three groups of elements and are low in metalloids compared to previously known liquid quenched amorphous alloys rich in iron, nickel, cobalt, chromium and/or manganese. The alloys can be readily formed in the amorphous state and are characterized by high hardness, high elastic limit and, for selected compositions, good corrosion resistance. Products made from these alloys include cutting tools, such as razor blades.
TL;DR: In this paper, the time evolution of the KLL Auger spectrum of carbon as a function of temperature is used to derive the kinetics of the surface diffusion and bulk-to-surface precipitation of carbon on polycrystalline nickel.
TL;DR: In this article, the stacking fault energies of the fee alloy series Fe-28 Ni to pure Ni were investigated using X-ray diffraction line profile analysis, and anomalous reductions of the lattice parameter after cold work were found for the low nickel alloys; this was interpreted as evidence for Fe3Ni ordering.
Abstract: The stacking fault energies of the fee alloy series Fe-28 Ni to pure Ni were investigated using X-ray diffraction line profile analysis. A minimum stacking fault energy of about 70 mJ/m2 occurs at the approximate composition of Fe-40 pct Ni. From this point, the lower nickel alloys rapidly increase to a very high stacking fault energy, estimated to be 200 mJ/m2, while the energies of the high Ni alloys rise linearly to the Ni value of 214 mJ/m2. Anomalous reductions of the lattice parameter after cold work were found for the low nickel alloys; this was interpreted as evidence for Fe3Ni ordering and corrections to the stacking fault energy were made.
Patent•
30 Dec 1976TL;DR: A coating composition for producing high temperature, wear-resistant coatings on a metallic substrate, such as a nickel, cobalt, or iron base alloy, consisting of a cobalt base alloy with chromium, tantalum and carbon additions thereto, was proposed in this paper.
Abstract: A coating composition for producing high temperature, wear-resistant coatings on a metallic substrate, such as a nickel, cobalt, or iron base alloy, consisting of a cobalt base alloy with chromium, tantalum and carbon additions thereto. The basic composition may also contain one or more of aluminum, yttrium or the rare earth metals, silicon, manganese, or a dispersion of a metal oxide, such as alumina (Al 2 O 3 ).
TL;DR: In this article, the anodic behavior of nickel in acidic media is carried out by steady state polarization curves and faradaic impedance measurements as a function of various parameters related to the electrolyte: pH, concentration and the nature of the anions.
TL;DR: In this article, the nature of argon-ion bombarded nickel surfaces and their subsequent interaction with oxygen at ordinary temperatures have been studied using X-ray and UV photoelectron spectroscopy, including angular variation measurements and the determination of work function changes, in combination in the same apparatus.
TL;DR: In this article, a study of the magnetic and electric properties suggests the delocalization of the nickel e g electron in a partly filled σ* d x 2 − y 2 band.