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Thin film deposits of Cu, Ni, and Rh were obtained by hydrogen reduction of , , , and from the gas phase (tfa = trifluoroacetylacetonate anion; hfa = hexafluoroacetylacetonate anion). The chelates are well suited for gas plating purposes by virtue of their high volatility and ease of reduction by hydrogen. The deposit…
Electronic currents in insulators are strongly controlled by trap sites and therefore trapping can account for long-term charge and discharge currents. Some general calculations are carried out for the discharge of disorderly insulators; in most cases the discharge current decreases inversely with time. Measurements a…
The vibrational spectra of four isotopic nitric acid molecules including the 15N and D species have been obtained in the vapor and solid phases. The Raman spectra of anhydrous and wet normal nitric acid were also studied. Previous assignment of the fundamental modes has been revised, and the spectra in the three phase…
The generalized equations of state governing the attainment of equilibrium have been formulated for bubbles (holes containing gas under pressure) and for voids (holes containing no gas). The equilibrium shape of bubbles is shown to be that which produces the minimum surface energy (γ) for a specific volume, and is uni…
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Techniques for physical and chemical evaluation of silicon oxide films formed by a wide variety of techniques have been developed. It has been established that by the use of infrared absorption spectroscopy, preferential etching procedures, precise optical measurements of thickness, density, and refractive indices, an…
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Abstract In this review paper, these types of molecular weight distribution found in typical polymers are described. It is pointed out that procedures for fractionating polymers usually yield incomplete information on molecular weight distribution unless the fractions are characterized for molecular weight. In additio…
Abstract Durch eine Erweiterung der Symmetrietransformationen für die Spindichte in Kristallen wird erreicht, daß neue Symmetriegruppen entstehen. Diese Gruppen stellen eine Verallgemeinerung der Shubnikov‐Gruppen oder magnetischen Raumgruppen dar und ermöglichen auch eine Beschreibung der Symmetrie von ebenen und räu…
The large differences in the activity of platinum‐on‐carbon anodes that could be produced by the choice of carbon indicated that an important chemical interaction existed between the platinum and the carbon surface. A chemical interaction was also indicated by electron‐spin‐resonance measurements on plain and platiniz…
Using a recently proposed concept of cell wall structure based on a multiplicity of lamellae coaxial with the cell, the effect of drying on the structure of the cell wall of bleached spruce sulphite tracheids has been examined by means of nitrogen adsorption. The data suggest that in the fully water-swollen wall there…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Interconversions of Octahedral, Planar, and Tetrahedral Nickel(II) ComplexesA. Chakravorty, J. P. Fennessey, and R. H. HolmCite this: Inorg. Chem. 1965, 4, 1, 26–33Publication Date (Print):January 1, 1965Publication History Published online1 May 2002Published inis…
Relative values of the diffusion coefficients of the systems He–Ar, Ar–Xe, and He–Xe have been determined over the temperature range 0° to 120°C by a two-bulb method. The experimental diffusion coefficients, at 1 atm pressure, can be described by the following equations: He–Ar: log10D=1.684log10T−4.2902,Ar–Xe: log10D=…
In an effort to develop new and improved polymeric materials for space application, a new series of polymers has been prepared. Some of these have shown outstanding thermal stability and good stability when exposed to ultraviolet radiation in a vacuum environment. High molecular weight polymers of the general type, ha…
With the availability of the ‘free ion’ spectrum of trivalent praseodymium, a closer analysis of the nephelauxetic effect in praseodymium complexes is made. An explanation for the greater decrease of F 2 parameter compared to F 4 and F 6 has been presented. A theoretical explanation of the two slopes resulting for the…
Abstract In an atomistic description of thermal diffusion atomic jump probabilities up and down the temperature gradient are different because of the non‐equilibrium phonon distribution. Starting from Rice's dynamical theory of diffusion this picture is applied to a one‐dimensional model (linear chain). The scattering…
Abstract The const rainment of the noncrystalline regions in polyethylene samples with various thermal and mechanical histories has been determined from measurements of the degree to which the activity of para ‐xylene sorbed in the polymer is enhanced relative to its hypothetical value in the absence of crystallites.…
Abstract The temperature dependence of the electrical conductivity and of the Seebeck coefficient of NiO samples with various Ni 3+ concentrations is determined. These samples are obtained from a nickel salt, using various decomposition temperatures. The temperature dependence of the hole concentration, p α , is calcu…
D. Nicholson, Trans. Faraday Soc., 1965, 61, 990 DOI: 10.1039/TF9656100990
The solubilities in the system CaSO 4 –NaCl–H 2 O, at 1 atm pressure and 35°, 50°, and 70°C, have been determined by approaching the solubility curves from both the undersaturation and supersaturation sides. The experimental runs are of long duration, as much as 3 months; these rates should be commensurate with those…