S 8. The kinetics of the thermal decomposition of magnesium hydroxide
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Reactions of Zirconium, Titanium, Columbium, and Tantalum with the Gases, Oxygen, Nitrogen, and Hydrogen at Elevated Temperatures
A systematic study is made of the kinetics of the reactions including a study of the time, temperature, and pressure variables. The reaction rates are studied by the vacuum microbalance method and the surface structures by the electron diffraction method. The data are correlated with fundamental diffusion and solution…
The influence of foreign ions on crystal growth from solution. 1. The stabilization of the supersaturation of calcium carbonate solutions by anions possessing O-P-O-P-O chains
B. Raistrick, Discuss. Faraday Soc., 1949, 5, 234 DOI: 10.1039/DF9490500234
Magnetostriction and Order-Disorder
An experimental and theoretical study of the relationship between saturation magnetostriction and the order-disorder transformation in an iron-cobalt alloy has been carried out. For the experimental work Fe-Co alloys in the neighborhood of the 50 atomic percent composition containing 0.75 percent Cr were employed. Mea…
Preparation of Hyper-Pure Silicon
The preparation of hyper‐pure silicon by reduction of silicon tetrachloride with zinc vapor is described. This reaction, which takes place at 950 C, was carried out in apparatus constructed of fused silica. The silicon prepared by this process was essentially spectrographically free of metallic impurities, and had ext…
A Calculation of the Changes in the Conductivity of Metals Produced by Cold-Work
The increase in the electrical resistance of severely cold-worked metals has been calculated by assuming that the important change which occurs during cold-work is the introduction of large numbers of Taylor dislocations. The results obtained are as follows: The calculated increase in the electrical resistance of poly…
THE PLASTIC YIELDING OF NOTCHED BARS UNDER TENSION
The state of stress in the core of a notched bar is analysed at the moment when pronounced plastic yielding begins. The theory is two-dimensional and an ideal plastic-rigid material is assumed. Following a general analysis of the problem, the magnitude of the constraint factor is calculated for a deep notch with a sem…
619. The thermal degradation of ethylene polymers
W. G. Oakes and R. B. Richards, J. Chem. Soc., 1949, 2929 DOI: 10.1039/JR9490002929
A Simple Domain Structure in an Iron Crystal Showing a Direct Correlation with the Magnetization
A hollow rectangle cut from a single crystal of 3.8 percent silicon iron has been studied with the aid of powder patterns and flux measurements. The edges and surfaces were all cut accurately parallel to 100>, the directions of easy magnetization. The domain pattern consists of 8 domains, four forming an inner rect…
689. A violet water-soluble copper cyanide
A. Glasner and K. R. S. Asher, J. Chem. Soc., 1949, 3296 DOI: 10.1039/JR9490003296
The Effect of Oxygen on Inhibition of Corrosion by Nitrite
A study has been made of the effects of the concentration of dissolved oxygen and temperature on the rate of breakdown of sodium nitrite in the presence of steel, and on the rate of corrosion of the steel. It was found that, at any given temperature, an increase in concentration of oxygen decreased the amount of nitri…
Mechanisms of hydrogen catalysis
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Physical Adsorption on Non-Uniform Surfaces
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Terrell L. Hill; Physical Adsorption on Non‐Uniform Surfaces. J. Chem. Phys. 1 January 1949; 17 (…
Some Effects of Heating Zirconium in Air, Oxygen, and Nitrogen
Zirconium metal was heated in nitrogen, oxygen, and air at temperatures ranging from 425 to 1300 C. Observations were made on the gain in weight, micro‐ and macrohardness, and metallographic structures. Nitrogen diffuses into zirconium at a much slower rate than oxygen. A marked increase in penetration of both gases w…
Réalisation d'un quart d'onde quasi achromatique par juxtaposition de deux lames cristallines de même nature
Les auteurs montrent que l'on peut obtenir un quart d'onde quasi achromatique en juxtaposant deux lames cristallines, l'une demi-onde, l'autre quart d'onde pour la région moyenne à achromatiser. L'angle des lignes neutres des deux lames étant de 60 degrés — β (β un angle inférieur à 3,5 degrés dépendant de la nature d…
Alkaline Earth Halophosphates and Related Phosphors
A class of new phosphors of great technical importance is described, which enables white light to be obtained in fluorescent lamps from a single chemical compound. The new materials are alkaline earth halophosphates activated with antimony and manganese. Luminescent properties are discussed as a function of compositio…
Abnormal and modified crystal growth. Introductory paper
A. F. Wells, Discuss. Faraday Soc., 1949, 5, 197 DOI: 10.1039/DF9490500197
Studies in hydrogen overpotential. The effect of catalytic poisons at platinized platinum and nickel
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Über die reaktion von borsäure und borax mit polysacchariden und anderen hochmolekularen polyoxy‐verbindungen
Abstract Nicht nur niedermolekulare, auch hochmolekulare Verbindungen mit benachbarten, cis‐ständigen Hydroxylgruppen bilden Komplexe mit Borsäure oder Boraten; unter geeigneten Bedingungen entstchen Koordinationsverbindungen aus einem Molekül Borsäure und zwei Diolgruppen. Diese Didiol‐Borsäure‐Komplexe können als Ha…
Klockmann's Lehrbuch der Mineralogie
"Klockmann's Lehrbuch der Mineralogie." Geologiska Föreningen i Stockholm Förhandlingar, 71(1), p. 184