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Ceramic coatings were prepared from materials having low absorption coefficients for thermal neutrons. They were specifically designed for application to typical high‐temperature alloy parts for use in nuclear reactors. Best results were obtained with boron‐free coatings of the frit‐refractory type, in which a high‐ba…
The reflectivity of an ideal metal is calculated for infra-red light by a quantum-mechanical method. It is assumed that the conduction electrons in the metal absorb light by a photoelectric process which takes place near the surface, that these electrons behave as if they are free and that the light within the metal d…
Abstract The structural formulas were determined of very pure specimens of montmorillonite, bei-dellite, saponite, nontronite, hectorite, wolchonskoite, vermiculite, and batavite. The lattice perfection of these minerals and the nature and variation of their crystalline swelling depend significantly on the surface den…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIllumination of cis- and trans-Stilbenes in Dilute SolutionsRobert E. BucklesCite this: J. Am. Chem. Soc. 1955, 77, 4, 1040–1041Publication Date (Print):February 1, 1955Publication History Published online1 May 2002Published inissue 1 February 1955https://pubs.acs.org/doi/10…
Abstract The ethylenediamine‐cellulose complex, previously described by Trogus and Hess, has been reinvestigated with regard to its stability toward a series of solvents and to the differences in the fine structure of the cellulose remaining after its decomposition. It is shown that nonpolar solvents which do not cont…
The concentrations of imperfections in silver halides grown from the melt were investigated by comparing the measured densities with the ideal densities computed from the lattice dimensions. The density defect of the most perfect specimen of silver bromide was $\frac{\ensuremath{\Delta}\ensuremath{\rho}}{\ensuremath{\…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE PREPARATION OF POLYMERIZABLE SILANES CONTAINING ORGANOMETALLIC SUBSTITUENTS IN THE SIDE-CHAINSDIETMAR SEYFERTH and EUGENE G. ROCHOWCite this: J. Org. Chem. 1955, 20, 2, 250–256Publication Date (Print):February 1, 1955Publication History Published online1 May 2002Publishe…
A decrease in the y-ray radiation yield of ferric ions, GFe+++, from 15.6 to 0.66 occurs on the addition of cupric sulfate to aqueous air-saturated ferrous sulfate solutions (1). This yield of 0.66 is attributed to an oxidation of the ferrous ion by hydrogen peroxide formed in the y-ray hot spot and is not due to oxid…
Abstract The various proposed structures for polymers derived from benzyl type compounds have been discussed and the likelihood of these structures considered in the light of a study of their preparation and properties. Both the para substituted structure of Shriner and Berger and the pendant structure of Henne and Le…
Abstract Several montniorillonites and a nontronite were digested in hydrochloric acid at constant temperature for various periods of time. Soluble iron, aluminum, magnesium, and in two samples titanium, were determined for each digestion period. Rate of solution curves were obtained by plotting the logarithm of the p…
Experiments suggest that dislocations in germanium act as rows of closely spaced acceptor centres. In n-type material a dislocation accepts electrons and becomes a line of negative charge surrounded by a cylindrical region of fixed positive space charge. An array of parallel dislocations will have relatively little ef…
Data on some of the physical properties of plutonium metal are given, including allotropic modifications, crystal structures, transformation temperatures, melting point, densities, expansion coefficients, electrical resistance, and magnetic susceptibility.
The paramagnetic resonance absorptions in several trichelate complexes of Cr+3 have been investigated at room temperature and at 1.2- and 3.0-cm wavelengths. From single crystal measurements on chromic acetylacetonate the orientations of the electric axes were determined and the parameters in the spin-Hamiltonian foun…
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 H. E. Farnsworth, R. E. Schlier, T. H. George, R. M. Burger; Ion Bombardment‐Cleaning of Germaniu…
Following an earlier paper based on the Morse potential, the analysis of the thermal properties of a linear chain is now extended to cover an interatomic potential of arbitrary form. The Lennard-Jones potential is taken as an example and the results for the thermal expansion coefficient are compared with experimental…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of Crystallization in High Polymers: Natural Rubber1,2Donald E. Roberts and Leo MandelkernCite this: J. Am. Chem. Soc. 1955, 77, 3, 781–786Publication Date (Print):February 1, 1955Publication History Published online1 May 2002Published inissue 1 February 1955h…
Abstract The hydrated Mg-vermiculite lattice contains double sheets of water molecules interleaved with silicate layers. In the fully hydrated condition, each water sheet is arranged in a regular hexagonal pattern and the interlayer cations are located midway between water sheets in octahedral coordination. Release of…
Data are presented on the changes in the room‐temperature refractive index and density of a borosilicate crown glass produced by different heat‐treatments. Measurements on a large number of samples with widely varying thermal history show that the refractive index is a single‐valued function of the density. The increa…
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Las piezas aligeradas presentan una serie de propiedades: densidad, aislamiento térmico, etc. Que determina siempre, siempre que no se precisen, simultáneamente, grandes resistencias. Su preparación, tal como se indica en este artículo, carece de dificultades.