Luminescent Properties of Eu2+ and Eu2+ + Mn2+ Activated BaMg[sub 2]Si[sub 2]O[sub 7]
Abstract not Available.
Materials Literature
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Thermal Conductivity of Reinforced Plastics
The addition of reinforcing fillers to thermoplastics can produce composite materials which combine enhanced physical properties with ease of processing. For many materials applications, the design engineer needs information on thermal properties, such as thermal conductivity and heat capacity. Published data on therm…
Gas-phase Raman spectra of some dihalides of zinc and mercury, of ‘GaCl 2 ’ and of GaCl 2 Br and GaBr 2 Cl
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…
Les coefficients de magnétostriction
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 interpretation of rhombic g tensors in copper complexes
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…
The novel magnetism and crystal structure of the complex di-µ-hydroxybis(bipyridyl)dicopper( II ) sulphate pentahydrate
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.
Stereoscan observations on the pollen genus Classopollis Pflug 1953
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Stoichiometry of Anodic Copper Dissolution at High Current Densities
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…
Electrochemical Characteristics of Iron in Acidic Solutions Containing Ring-Substituted Benzoic Acids
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…
Lattice Vibrations of Cu2O at the Long Wave Limit
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.
Studies of the hydrogen held by solids. Part 17.—The ortho-para H 2 Conversion and H 2 –D 2 exchange reactions over a transition alumina
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…
Mathematical Study of Galvanic Corrosion Equal Coplanar Anode and Cathode with Unequal Polarization Parameters
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…
Radionuclides in the Environment
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…
Etude par des mesures de diffraction de neutrons et de magnétisme des propriétés cristallines et magnétiques de composés cubiques spinelles Co3-xMnxO4(0,6 ≤ x ≤ 1,2)
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…
The correlation between dislocation structure and work‐hardening behaviour of molybdenum single crystals deformed at 293° K
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…
High Field Ionic Conduction in Tantalum Anodic Oxide Films with Incorporated Phosphate
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…
Low Energy Auger Emission from Lithium Fluoride
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…
Dynamic properties of solutions. Models for chain molecule dynamics in dilute solution
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…
Reactions between methyl-, acetyl-, and phenyl-pentacarbonylmanganese and acetylenes
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…
Rare Earth Oxysulfide X-Ray Phosphors
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…