Materials Literature
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Abstract The friction coefficient μ and the mass loss M' per centimetre, of Al, Ag, Cu, Pt, Fe, Mo, U and W specimens ~ 1 to 2·5 cm long are investigated as a function of the mean particle diameter D of abrading emery-paper surfaces (dry) on which they slide at a few cm/s and ~1 Kg load. On any grade of abrasive, μ an…
The direct exchange integral which occurs in the Heisenberg theory of ferromagnetism is evaluated for all internuclear spacings. We find that it is always positive, whereas Bethe originally suggested it would be positive only at large spacing and more recently it has been suggested that the integral should always be n…
The electronic specific heat coefficient was measured in the temperature range 1.4\ifmmode^\circ\else\textdegree\fi{} to 4.2\ifmmode^\circ\else\textdegree\fi{}K for 48 solid solution alloys in the following binary systems: Ti-V, V-Cr, V-Fe, Cr-Mn, Cr-Fe, and Fe-Co. The electronic specific heat vs electron concentratio…
A thermodynamic theory is given of a class of magnetic crystals which transform from ferromagnetic to antiferromagnetic states as the temperature is varied. Applications are suggested to ${\mathrm{Mn}}_{2\ensuremath{-}x}{\mathrm{Cr}}_{x}\mathrm{Sb}$ and to crystals having the nickel arsenide type structure. It is show…
An irradiation capsule for high-temperature fuel irradiations has been developed to permit constant temperature control over a range of about ±35% of design power. Control is achieved by the variation in thermal conductivity of a binary gas mixture in a control annulus located between the test specimen and the capsule…
The physical properties of viscose rayon filament yarns have been studied before and after treatment with a wide range of resin and formaldehyde finishes applied by normal, as well as unconventional, methods. A general relationship has been observed between the tensile elastic recovery, extensibility, wet initial modu…
Abstract Pure crystalline potassium Kurrol salt was prepared and its X-ray pattern was compared with that obtained by Klement et al. The solubility of the potassium Kurrol salt in water was 0.007∼0.009 per cent at room temperature. Qualitative observation was made for the reactions of the potassium Kurrol salt with va…
This article discusses the classification of calcium carbonate stability as an adjunct to natural or artificial protective coatings on metals. This is due to the fact that the quantity of an available protective ingredient is limited for any water and may not be sufficient to neutralize or react with the quantity of p…
The bulk magnetic susceptibilities of single gallium crystals and polycrystalline gallium spheres were measured at 25°C. The following anisotropic diamagnetic susceptibilities were found: a axis (−0.119±0.001)×10−6 emu/g, b axis (−0.416±0.002)×10−6 emu/g, and c axis (−0.229±0.001) emu/g. The susceptibility of the poly…
Abstract The retardation of methyl methacrylate polymerization by hydroquinone, 1,4‐napthalenediol, and benzoquinone was studied by an accurate dilatometric method. The degree of retardation was found to be very small for the phenols in the absence of air and very sensitive to the presence of impurities. Kinetic analy…
Abstract High concentrations (10% or greater)of zinc chloride or mixtures of aluminum isopropoxide–zinc chloride catalyzed the polymerization of ethylene oxide to low molecular weight polymer. Endgroup analysis of the polymer gave a 1:1 ratio of hydroxyl to chloride when zinc chloride was the catalyst. Using the alumi…
The spontaneous magnetostriction of cubic crystals can be expressed in the form λ = C 0 + C 1 (α 1 2 β 1 2 + α 2 2 β 2 2 + α 3 2 β 3 2 ) + C 2 (α 1 α 2 β 1 β 2 + α 2 α 3 β 2 β 3 + α 3 α 1 β 3 β 1 ) where the α 1 and β 1 are, respectively, the direction cosines of the magnetization vector and the measuring direction, w…
Abstract The inhibitive properties of the sodium, calcium and lead salts of caproic, oenanthic, caprylic, pelargonic, capric, suberic, azelaic and sebacic acids have been examined in the pH range 4·0–6·0 at concentrations 10 −5 to 10 −2 N. The inhibitive efficiency increased with the length of the carbon chain up to a…
Illumination of a sodium chloride crystal at liquid nitrogen temperature after x-ray irradiation at a higher temperature or higher temperature annealing has two effects upon its thermoluminescence: Glow peaks stable at the temperature of x-ray irradiation or annealing are diminished in intensity. Missing glow peaks, u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE VOLUME CHANGE ON MIXING IN LIQUID METALLIC SOLUTIONS. I. ALLOYS OF CADMIUM WITH INDIUM, TIN, THALLIUM, LEAD AND BISMUTHO. J. KleppaCite this: J. Phys. Chem. 1960, 64, 10, 1542–1546Publication Date (Print):October 1, 1960Publication History Published online1 May 2002Publi…
The infrared spectrum of KOH has been obtained in the region 4000–300 cm—1. At 23°C the spectrum shows two broad bands, one at 3600 cm—1 and the other at 643 cm—1. At —180°C the O–H stretching band near 3600 cm—1 appears as a doublet. Splitting is shown to arise from coupling between the two OH— ions in the unit cell.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPurifying Hydrogen by Selective Oxidation of Carbon MonoxideMarion Brown, Albert Green, Gunther Cohn, and Holger AndersenCite this: Ind. Eng. Chem. 1960, 52, 10, 841–844Publication Date (Print):October 1, 1960Publication History Published online1 May 2002Published inissue 1…
Abstract Di‐cyclopentadienyl‐titan(IV)‐dichlorid reagiert mit Lithiumboranat in Äther unter Bildung von Di‐cyclopentadienyl‐titan(III)‐boranat, (C 5 H 5 ) 2 TiBH 4 . Die chemischen und physikalischen Eigenschaften der Verbindung sprechen dafür, daß die Boranatgruppe BH an das Titanatom über eine doppelte Wasserstoff‐a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMETAL—POLYELECTROLYTE COMPLEXES. VIII. THE POLY-N-VINYLIMIDAZOLE—COPPER(II) COMPLEXDaniel H. Gold and Harry P. GregorCite this: J. Phys. Chem. 1960, 64, 10, 1464–1467Publication Date (Print):October 1, 1960Publication History Published online1 May 2002Published inissue 1 Oct…
An attempt has been made to establish a mechanism for stress corrosion by direct observation on the propagation of cracks in α-brass tested under ammonia. The observations indicate that failure might be described by a two-stage process, of local embrittlement, followed by a cleavage-like fracture. Such a model demands…