Strength and Energy Absorption Capablities of Plain Concrete Under Dynamic and Static Loadings
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Solid-State Electrochemical Cells Based on Charge Transfer Complexes
Solid‐state electrochemical cells have been devised using a variety of metals as anodes and electronically conducting charge‐transfer complexes as cathodes. The product of the electrochemical reaction, the electrolyte, was formed in situ . Data are reported for halogen complexes as well as for complexes containing nit…
Crystal nucleation in polyethylene: The droplet experiment
Abstract The droplet technique was utilized to obtain estimates of the isothermal rate of homogeneous crystal nucleation in highly supercooled melts of unfractionated linear polyethylene. In a typical experiment a cell containing a suspension of several hundred micron‐size spherical droplets of the polymer was placed…
The Mechanism of Deformation of the Ordered CuAu Alloy
Abstract Electron microscopy techniques are used to study the domain structure and the mechanism of deformation of the ordered CuAu alloy. Investigations are made into the factors impeding the passage of dislocations across the boundary between domains with differently orientated c ‐axes. Experiments indicate that the…
Boron nitride fibers
Abstract The structure and properties of boron nitride fibers were examined. The fibers are polycrystalline consisting of a major phase of turbostratic boron nitride and a three‐dimensional ordered phase which is not hexagonal. The density of the fibers is determined by the amount of internal microporosity and crystal…
Topochemistry. Part XXIV. The luminescence properties of N-salicylideneaniline and related anils in solution
The N-salicylideneanilines studied all luminesce in solution on irradiation with near-ultraviolet light. The intensity of the emission is very low at room temperature in most cses, but becomes appreciable at low temperatures (e.g., below –100°) even when the solvent is still fluid. The intensity is greater in polar th…
Structure and Luminescence of the Phosphate-Vanadates of Yttrium, Gadolinium, Lutetium, and Lanthanum
Phosphate‐vanadates of Y, Gd, Lu, and La, formed from powders at 1000 °C, were solid solutions having the structure of either xenotime or monazite. Compositions containing 25–50 mole % , , or exhibited intense blue photoluminescence arising from absorption and fluorescence within the vanadate groups. The fluorescence…
Mass spectrometric determination of the dissociation energies of the molecules GeS, ScS, YS, LaS and CeS
The dissociation energies of the gaseous monosulphides GeS, ScS, YS, LaS and CeS were determined : D°0(GeS)= 130.9±0.6; D°0(ScS)= 113.4±2.5; D°0(YS)= 125.7±2.5; D°0(LaS)= 137.5±2.5; and D°0(CeS)= 136.0±3.0 kcal/mole. In an appendix, selected values for the dissociation energies of the monoxides ScO, LaO, YO, CeO and V…
Tautomerism and Geometric Isomerism in Arylazo‐Phenols and Naphthols. Part III. Orthohydroxy Derivatives and their Reversible Photochemical Reactions
Abstract Solutions of o‐hydroxy or o‐methoxy azobenzene and phenylazonaphthalenes were studied spectroscopically and photochemically in a wide range of temperatures and solvents. All the hydroxy derivatives exist in solution in the azo form, except for (I) and (IV) which show an equilibrium between the azo and hydrazo…
Thermal Decomposition of Brucite: II, Kinetics of Decomposition in Vacuum
Polycrystalline samples, thin single crystals, and—325 mesh powders of brucite decomposed according to a first‐order rate equation consistent with a random nucleation process in beds of micron‐sized particles formed by disruption during the very early stages of the process and consistent with electron and optical micr…
Some aspects of vapor‐induced crystallization of polycarbonate of bisphenol A
Abstract A method is presented to crystallize polycarbonate of bisphenol A under constant vapor pressure of solvents at near ambient temperatures. Methylene chloride and acetone were used as crystallizing liquids. Acetone is more powerful in inducing crystallization but the final degree of crystallinity does not depen…
A Method for Describing a Flexible Dislocation
Abstract A procedure for determining the equilibrium shape of a dislocation under the influence of both internal and external stress fields is described. The method, which is an extension of that used by Brown to determine the shape of extended nodes, does not require the explicit numerical integration of line integra…
The Effects of Double Insulating Layers on the Electroluminescence of Evaporated ZnS:Mn Films
The performance of electroluminescent layers deposited between double insulating films is described. The dependence of emission properties on and film thickness and Mn content are outlined. The relatively bright (700 ft‐L) and efficient (1 lpw) emission is interpreted in terms of excursions from equilibrium trap occup…
Atomie Arrangement in the Homogeneity Range of the Laves Phases ZrFe2 and TiFe2
Abstract The Laves phases ZrFe 2 (MgCu 2 type) and TiFe 2 (MgZn 2 type) have a homogeneity range of several atomic percent (mainly on the side rich in iron). An investigation is made of the modifications to this type of AB 2 lattice which result from an excess of B‐atoms. X‐ray and neutron diffraction measurements sho…
On the Passivity of Iron-Chromium Alloys
Electrochemical studies, as well as microscope observations, on an Fe‐24% Cr alloy in have shown that at least two distinct, potential‐dependent films are formed. The primary film, which is responsible for the initial passivation, is stable only within a few millivolts of the primary activation potential. A secondary…
Diffusion of liquids in crosslinked rubbers. Part 1
The diffusion of various liquids in natural rubber vulcanizates has been studied by following the kinetics of the mass uptake of a sheet of rubber while immersed in the liquid. An anomaly in the mass uptake-time relation is due to the stresses set up in the sheet during swelling and to their variation as the swelling…
A Study of the Energy Levels in Benzene and Some Fluorobenzenes by Photoelectron Spectroscopy
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Study of the Energy Levels in Benzene and Some Fluorobenzenes by Photoelectron SpectroscopyI. D. Clark and D. C. FrostCite this: J. Am. Chem. Soc. 1967, 89, 2, 244–247Publication Date (Print):January 1, 1967Publication History Published online1 May 2002Published inissue 1…
Raman studies on species in aqueous solutions. Part II. Oxy-species of metals of Groups VIA, VA, and IVA
Raman and infrared spectra have been measured of solutions of oxides of metals of Groups VIA, VA, and IVA in aqueous hydrofluoric, hydrochloric, and perchloric acids. Evidence was obtained for the existence in such solutions of fluoro- and chloro-complexes of molybdenum and tungsten with cis-dioxo-ligands, of mono-oxo…
Relationship of structure and ionic mobility in solid MAg4I5
The crystal structure of MAg4I5(M = K, Rb, NH4) is cubic with a= 11.2 Å, z= 4 and space group of the enantiomorphic pair P4132 and P4332. The locations of the I– and M+ ions have been deduced from symmetry and packing considerations. The Ag+ ions do not occupy distinct single sites, but are distributed randomly over a…
Structure and Physical Properties of Solid and Liquid Vanadium Pentoxide
The electrical resistivity of near-stoichiometric crystalline V2O5 has been measured as a function of crystal orientation and oxygen partial pressure from 25° to 300°C. Conductivity is insensitive to ambient atmosphere. The activation energy for conduction is 0.20 eV. Molten V2O5, however, is sensitive to oxygen parti…