Materials Literature
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The rates of the H2–D2 exchange, the o-p H2 and p-o D2 conversions were measured on the surfaces of a very pure alumina, with and without a portion of the sites selectively poisoned with CO2. These data were supplemented with results obtained from surface dehydroxylated to different extents. When the alumina was dehyd…
This paper gives a theoretical analysis of the distribution of potential and current density on the surface of a coplanar galvanic cell in which the polarization parameters for cathode and anode are unequal. The potential at any point can be represented as a Fourier series, in which the coefficients themselves are inf…
This paper deals mainly with the condensation of trace concentrations of radioactive vapor onto spherical particles of a substrate. For this situation the relation between the engineering approach, the molecular approach, and the fluid-dynamic approach are illustrated for several different cases of rate limitation. Fr…
On étudie par des mesures de diffraction de neutrons, de rayons X et de magnétisme les échantillons spinelles cubiques Co3-xMn xO4 avec 0,6 ≤ x ≤ 1,2. Toutes les mesures sont faites sur des poudres. On détermine l'inversion. Les mesures de rayons X à 4,2 °K ne mettent en évidence aucun changement de système cristallin…
Abstract The dislocation structure of high‐purity molybdenum single crystals after tensile deformation at 293° K is studied by transmission electron microscopy. Dislocation and debris densities were determined as function of strain. The stress–strain curve is characterized by a high initial work‐hardening rate and a s…
The dependence of the ionic current density J on the mean field E ¯ in oxides grown on tantalum in H 3 PO 4 electrolyte was studied using ellipsometry to estimate the thickness. The field in the outer layer which is believed to grow due to metal ion motion is higher because of phosphate incorporation. The field in thi…
Abstract Several low energy Auger transitions have been detected in lithium fluoride. These all have energies below 50 eV and cannot be indexed in terms of transitions involving the electronic levels of fluorine ions alone. A model is proposed to explain the experimental results in terms of an ionisation of a lithium…
The behaviour of the Zimm model for flexible chain dynamics is illustrated by the dielectric response for arbitrary field strength and by a calculation of the intrinsic viscosity from an appropriate time correlation function. The stochastic dynamics of a chain with constant bond lengths and weak correlations between a…
Methyl-, acetyl-, and phenyl-pentacarbonylmanganese undergo cis-addition reactions with the acetylenes PhC⋮CH, RO2C·C⋮C·CO2R (R = Me or H), MeO2C·C⋮CH, or CH⋮C·CHO to afford stable (vinyl ketone) tetracarbonylmanganese derivatives, in which the keto-group is co-ordinated to a manganese atom. The reactions with phenyla…
Two rare earth materials, La2O2S:Tb and Gd2O2S:Tb, have significant potential as inputscreen phosphors for x-ray image intensifier use. These materials exhibit high luminescent efficiencies and high x-ray absorption. In this paper we present a detailed discussion of the properties of these new phosphors and suggestion…
Abstract Previous theoretical work dealt with polymer adsorption in which the adsorbed segments (trains) interact in the surface layer only. In this work the treatment is extended to Include also interaction between the loops dangling in solution. Fortunately, the excluded volume effects for adsorbed polymer chains ar…
A comparative study of tracer self-diffusion and creep has been carried out for the high-temperature plastic phase of succinonitrile. The results indicate that, as for other plastic solids, plastic deformation is self-diffusion controlled. Self-diffusion rates varied with temperature according to D=(4.3±1.3)× 10–4 exp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic Properties of a Model Reinforced Elastomer. Styrene-Butadiene Reinforced with PolystyreneGerard Kraus, K. W. Rollmann, and J. T. GruverCite this: Macromolecules 1970, 3, 1, 92–96Publication Date (Print):January 1, 1970Publication History Published online1 May 2002Pub…
The crystal structures of triphenylgallium and triphenylindium have been determined. Both compounds crystallise with Z= 4 in a unit cell of space group Pbcn, but they are not iso-structural. In the indium compound short intermolecular contacts suggest that weak association occurs by donation of electrons from a phenyl…
The polarised single-crystal electronic spectra of CaCu(AcO)4,6H2O are assigned in S4 and D2d symmetries, with a dxy ground state and yield the one-electron orbital sequence: dxy > dz2 > dxz, dyz > dx2–y2. The e.s.r. spectra yield the orbital reduction factors r⊥= 0·78 and r∥= 0·926 . That r∥ > r⊥ indicates substantia…
The crystal structure of synthetic α-dimorphite, As4S3, has been determined by a three-dimensional single-crystal X-ray examination. The crystals, of space group Pnma, have Z= 4 in a unit cell of dimensions a= 9·12, b= 7·99, and c= 10·10 Å. The structure was determined by application of Sayre's equation and electron-d…
Description The papers in the Symposium on Impact Testing of Metals were given at the Seventy-second Annual Meeting of the American Society for Testing and Mater als held in Atlantic City, N. J., 22-27 June 1969. The sponsors of this symposium were Committee E01 on Methods of Testing, Subcommittee 7 on Impact Testing,…
SummaryBy electroforming a copper or nickel surface to give mechanical keying, its adhesion to epoxide laminates can be increased from a peel strength of 4 lb/in to 12 lb/in. By oxidation or chemical treatment of the metal surface an improvement in peel strength of about 1 lb/in is obtained.
Although anodization of zirconium and its alloys generally results in the formation of barrier‐type films, porous anodic oxide films can be produced in some electrolytes and by some preparation techniques. A survey of common electrolytes reveals that those containing nitrate, chromate, dichromate, and phosphate ions c…
Cancrinite has been synthesized in the sodalite crystallization field at 80° by addition of sodium nitrate, chromate, or molybdate. The crystals then contain these salts as guest species in place of the carbonate often found in natural cancrinites.This promotion of the formation of cancrinite was ascribed to associati…