Materials Literature
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Solid solutions of BiFeO3 and PbZrO3 were investigated for crystallographic and dielectric properties. A new pseudocubic perovskite phase was found, which has been tentatively indexed as orthorhombic with the same unit cell as PbZrO3 but with dielectric properties characteristic of a ferroelectric substance. The Curie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnthalpy, heat capacity, and heat of fusion of aluminum from 366.degree. to 1647.degree.KRichard Addison McDonaldCite this: J. Chem. Eng. Data 1967, 12, 1, 115–118Publication Date (Print):January 1, 1967Publication History Published online1 May 2002Published inissue 1 Januar…
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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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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 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…
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…
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…
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…
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 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…