Materials Literature
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Most of the known oxides of lead including the intermediate oxides Pb 12 O 19 and Pb 2 O 3 have been prepared under equilibrium conditions. Precise X‐ray powder data have been obtained for the intermediate oxide phases. Solid‐vapor equilibrium data have been obtained for reactions in the system lead‐oxygen over the ra…
The OH → OD exchange reaction between deuterium oxide vapor and cellulose has been studied for thirteen different types of cellulose; the extent of exchange in a cellulose was determined by measuring the increase in the dry weight of the sample. With each cellulose the deuteration reaction was in two stages, a rapid s…
This paper is Part IT of a two‐part series reviewing the present understanding of space charge and electrode polarization in glass and the interrelations of these concepts with the usually measured electrical properties of glass. Emphasis is placed on a theory describing the distribution of static space charge in mate…
Experimental measurements have been made on the rate of dissolution of sapphire, dense poly‐crystalline alumina, mullite, fused silica, and anorthite in a 20A1 2 O 3 ‐4OCaO‐40SiO 2 slag at 1350° to 1500° C under conditions of free and forced convection. Dissolution rates and their temperature dependence were found to…
This investigation was conducted because the development of new alloys with increased resistance to pitting corrosion appears to be largely dependent on an understanding of the effects of various concentrations of alloying elements on the initiation and steady operation of localized pitting sites on the metal surface.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Electronic Structures of Square-Planar Metal Complexes. II. The Complexes of Maleonitriledithiolate with Copper(II), Nickel(II), Palladium(II), and Platinum(II)E. Billig, Raymond Williams, I. Bernal, James H. Waters, and Harry B. GrayCite this: Inorg. Chem. 1964, 3, 5, 6…
The reaction of pyromellitic dianhydride with a solution of a primary diamine in a solvent such as dimethylacetamide gives a viscous solutionof a polypyromellitamic acid of high molecular weight. The viscosity of the solution decreases greatly when it is aged at 35°C. Higher temperatures or the presence of water, exce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structure of Crystalline Tetraphenylporphine. The Stereochemical Nature of the Porphine SkeletonM. J. Hamor, T. A. Hamor, and J. L. HoardCite this: J. Am. Chem. Soc. 1964, 86, 10, 1938–1942Publication Date (Print):May 1, 1964Publication History Published online1 May 2002…
The deformation occurring during the drawing of polyethylene single crystals consisting only of {110} fold domains was studied by means of electron diffraction and bright-field and dark-field electron microscopy. Samples of several types of polyethylene crystals were used; all crystals studied being drawn 25% on a Myl…
X-Ray data, at both 290 K and 95 K, of high internal consistency, are reported together with the results of a number of detailed least-squares refinement analyses. The observed bond lengths, with an average estimated standard deviation of 0.008 A, are compared with those predicted theoretically by a number of procedur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Surface Area of Water Preadsorbed on Powdered SubstratesWilliam H. WadeCite this: J. Phys. Chem. 1964, 68, 5, 1029–1034Publication Date (Print):May 1, 1964Publication History Published online1 May 2002Published inissue 1 May 1964https://pubs.acs.org/doi/10.1021/j100787a0…
Refractive properties of barium fluoride are discussed. The refractive index, n, was determined at 25°C for 46 measured wavelengths from 0.2652 μ in the ultraviolet to 10.346 in the infrared. The dispersion equation n2−1=0.643356λ2λ2−(0.057789)2+0.506762λ2λ2−(0.10968)2+3.8261λ2λ2−(46.3864)2,where λ is expressed in mic…
The (110) surfaces of InSb, InAs, GaSb, and GaAs produced by the Gobeli-Allen cleavage technique, have been studied by low-energy electron diffraction. The unit mesh at this surface of these III-V compounds has the same dimensions as the substrate unit mesh. A strong asymmetry in the intensity of the hk and hk̄ diffra…
The distribution of plane-normal orientations in a polycrystalline sample can be investigated by x-ray diffraction measurements. Our problem is to deduce from such a set of data the maximum amount of information concerning the distribution of crystallite orientations within the sample. We restrict our attention to sam…
Examines the properties of phthalocyanine, the nomenclature of phthalocyanine compounds, and phthalocyanine polymers.
The type of fraction produced by various forms of stress, the dependence on the nature of the stress, and the rate of application are described. The role of microscopic cracks and the departure of actual strength from theoretical values are discussed. Illustrations are given of the propagation of fracture.
Measurements have been made of the effects of low-energy electron bombardment (0–300 ev) on a chemisorbed layer of oxygen on polycrystalline molybdenum. Oxygen is adsorbed in two states at room temperature with approximate heats of adsorption of 60 and 110 kcal/mole, respectively. O + ions are released from the weakly…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
Abstract An investigation has been made of the measurement of degree of swelling of vulcanizates and the estimation of υ τ , the volume fraction of polymer in a vulcanizate swollen to equilibrium. Methods have been established for dealing with a volatile swelling liquid, allowing for small percentages of nonpolymer in…
The application of autoradiography to the measurement of volume diffusion is limited because of the difficulty in interpreting the effects of the energy of the radiations, the scattering and absorption properties of the specimen and other complicating factors. A general method of interpretation is described in which t…