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The permeation process consists of the steps: adsorption, solution, diffusion, and desorption. These are discussed for glasses, polymers, and metals. There are two generalizations: (1) All gases go through all polymers. (2) No rare gas permeates any metal. Criteria are given for measurements of the permeation process.…
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Abstract not Available.
Anderson's treatment of super-exchange yields a qualitative rule for the dependence of interaction on angle Me—O—Me. Using this rule, and assuming a longer distance to lead to a weaker interaction, low-temperature saturation magnetizations for ferrimagnetic oxides with known crystal structures can often be predic…
Abstract not Available.
A semiempirical method for the determination of mass absorption coefficients for the very soft x-ray region of 5 to 50 A is described. A universal function for the absorption by K-shell electrons and another for absorption by L and extra-L shell electrons are given in table form to permit the calculation of mass absor…
R. K. Hart, Trans. Faraday Soc., 1957, 53, 1020 DOI: 10.1039/TF9575301020
The oxidation‐reduction kinetics of the ferrous‐ferric sulfate system have been measured on a stainless steel surface. The data completely support theoretical equations which describe the potential‐current relationships for such a system. The analysis applies to reversible electrodes and to corroding electrodes where…
The titanium--oxygen system has been studied by means of x-ray powder photographs of preparations quenched after annealing at various temperatures. A number of phases not previously described has been observed, viz., Ti/sub 2/O, TiO (low-temperature modification), Ti/sub 4/O/sub 7/, Ti/sub 5/O/su b 9/, Ti/sub 6/O/sub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Application of Differential Thermal Analysis to the Study of Reaction Kinetics1Hans J. Borchardt and Farrington DanielsCite this: J. Am. Chem. Soc. 1957, 79, 1, 41–46Publication Date (Print):January 1, 1957Publication History Published online1 May 2002Published inissue 1…
At low overvoltage values, deviations from Tafel behavior for a noncorroding electrode are due primarily to the reverse reaction of the oxidation‐reduction system, and at high overvoltages to concentration and/or resistance polarization. It is shown further that the practice of placing straight lines through a few exp…
Electron ejection from metals by ions is shown in this work to be a surface-sensitive phenomenon which is profoundly affected by the adsorption of a monolayer of foreign gas on an atomically clean metal surface. Monolayer adsorption is shown to decrease the total electron yield, ${\ensuremath{\gamma}}_{i}$, primarily…
The effects of strain amplitude on the internal friction and the Young's modulus of polycrystalline specimens of copper alloys (Cu–Zn, Cu–Al, Cu–P) with various concentrations of solute atoms have been investigated. The results are: 1. The critical stress, up to which the internal friction and the Young's modulus are…
Thermal and electrical properties of tungsten oxide were observed in a wide range of temperature. An entirely new anomaly was found at 1230°C, where the rate of sublimation increased abruptly. The amounts of anomalous heat were found to be 330, 450, 280 and 120 cal/mol at the 330°C, 740°C, 910°C and 1230°C transitions…
Abstract The melting temperatures of two of the crystalline modifications of gutta-percha and their mixtures with either methyl oleate or tetradecane as diluent were determined by x-ray diffraction and dilatometric methods. It was found that the melting temperatures of the two forms in the pure polymer were 64 and 74°…
Abstract Relations between degree of crosslinking and gel fraction in a polymer have been derived by several authors. An important parameter in these relations is the crosslinking index γ, the average number of crosslinks to which one original polymer molecule is linked. The relations have been applied to the determin…
The values for a number of physical properties are reported for a very high density form of thorium dioxide. When specimens of a mixture of 99½% ThO 2 and ½% CaO, by weight, were hydrostatically pressed at 30,000 lb. per sq. in. and heat‐treated for 1 hour at 1800°C., they attained 99.0% of theoretical density. All th…
Measurements of magnetic viscosity in equiaxed isotropic and anisotropic Alcomax III specimens have been made; the anisotropy was induced by cooling the material, from the single phase region, in a magnetic field of 4000 Oe. The results are discussed in terms of the concept of the thermal activation of irreversible do…
Abstract Die Hydridbromide der Erdalkalimetalle (CaHBr, SrHBr, BaHBr) lassen sich durch Zusammenschmelzen von Hydrid und wasserfreiem Bromid bzw. von Metall und Bromid in einer Wasserstoffatmosphäre bei 900° darstellen. Dabei fallen die Verbindungen in großen, glänzenden Blättchen an und ähneln in ihrem Aussehen weitg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic Data. 144-147. Rare Earth Oxides. Yttrium Sesquioxide, Y2O3; Dysprosium Sesquioxide, Dy2O3; Erbium Sesquioxide, Er2O3; Ytterbium Sesquioxide, Yb2O3Eugene. StaritzkyCite this: Anal. Chem. 1956, 28, 12, 2023–2024Publication Date (Print):December 1, 1956Publica…