Materials Literature
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The Raman spectra of HgX2(X = Cl, Br, or l), ZnX2, and HgXY (X,Y= Cl, Br, or l) are reported for the gaseous monomeric species. In no case was a deformation mode identified, although formally this mode is active for linear HgXY. When the compound ‘GaCl2’ was examined in the gas phase only bands due to GaCl and GaCl3 w…
Nous proposons une notation harmonique cohérente pour les énergies élastique, magnétoélastique et magnéto-cristalline et pour la magnétostriction des cristaux de symétrie cubique, quadratique, orthorhombique et hexagonale. Nous limitons notre description aux déformations externes des ferromagnétiques et des ferrimagné…
The information which can be derived from rhombic g values is discussed, and the g values reported for a number of copper complexes of known structure are used to calculate ground-state wavefunctions of the form ψ≈|cx2+ey2+fz2〉. In several low-symmetry complexes the ground-state can only adequately be described in ter…
For the complex di-µ-hydroxybis(bipyridyl)-dicopper(II) sulphate pentahydrate the effective magnetic moment per copper atom rises from 1·94 B.M. to 2·04 B.M. as the temperature is lowered from 298 to 84 K; the binuclear nature of the complex has been confirmed by a crystal structure determination.
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The influence of current density, flow rate, and electrolyte composition on the stoichiometry of anodic copper dissolution was investigated under conditions comparable to those of electrochemical machining. Weight loss measurements, x‐ray diffraction, and chemical analysis were used for the characterization of the dis…
The electrochemical behavior of Armco iron in in the absence and presence of ring‐substituted benzoic acids have been investigated by the measurement of the corrosion potentials, open‐circuit capacitances, potential‐current polarization characteristics, potential transients, and corrosion rates. Anomalous behavior was…
Abstract A study of the lattice dynamics of cuprite at the centre of the Brillouin zone is made and the force constants and the effective charge deduced. The energies of the optically inactive phonons are calculated and their symmetry determined. The symmetry of the upper valence band of the crystal is identified.
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…