Materials Literature
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The changes in the x-ray Debye–Scherrer diffraction pattern, as a function of plastic strain, have been measured for a silicon bronze (Cu–6·6 at. % Si–1·2 at. % Mn) tensile specimen. Analysis of line positions and line breadths gave the following results. The stacking-fault probability increased with extension, and ne…
The thermal conductivity K of high-purity platinum appears to be a reproducible quantity for temperatures between 75°K and the melting point at 2047°K. This behavior combined with the outstanding chemical and physical properties of platinum suggests that platinum could serve as a useful K standard in this region. From…
The polarized crystal spectrum of tetrakis-thoiurea-nickel chloride has been determined. The molecular symmetry is C4v; however, the results indicate that the absorptions arise from a field of lower symmetry, since in C4v symmetry the observed ``parallel'' absorptions would be orbitally forbidden. The intensity of the…
The ternary system U‐C‐O was investigated and a diagram is given expressing the phase relations in specimens which were reacted at 1800°C in vacuum or in inert atmospheres and furnace cooled. A U(C,O) single‐phase area exists in this diagram. The limit of substitutional solid solution of oxygen atoms for carbon atoms…
Anodic and cathodic polarizations of nickel have been studied using a galvanostatic technique with low current densities and an atmosphere of hydrogen. Polarization experiments have been conducted using 0.1 N sodium hydroxide, 1 N sodium carbonate and 0.1 N sodium borate solutions. It has been shown that passivation i…
Abstract Expansion of kaolinite with potassium acetate reduces the intensity of the 3695 cm −1 absorption band and causes the appearance of an additional one at 3600 cm −1 . Subsequent deuteration with D 2 O vapor shifts the 3695 cm −1 and 3600 cm −1 absorption bands to 2725 cm −1 and 2650 cm −1 respectively. The hydr…
1. Radioisotope incorporation studies of normal and lathyritic chick embryo bone collagen do not demonstrate any interference by lathyrism with collagen synthesis or fibril formation. 2. The results indicate that a portion of the extractable collagen from lathyritic chick embryo bone represents newly synthesized prote…
A rapid and accurate method for determining the Brewster angle by the Abelès condition is described. The technique is independent of index of refraction of the substrate and thickness of the film. The indices of refraction can be measured to an accuracy range of about 0.0002 to 0.0006.
Abstract Synthetic clays were prepared hydrothermally at 300° to 350°C and 15,000 psi from gels with compositions calculated to give a series of octahedrally and tetrahedrally substituted, 2:1-type layer silicates with charges of 0.5N, 1N, 1.5N, 2N, 2.5N, and 3N, where N equals the “normal” layer charge of montmorillo…
Two schools of thought have existed regarding the passivation mechanism of metals. One considers the film formed on the metal’s surface to be the principal protective device. The other ascribes the metal’s passivation to adsorption layers of oxygen or oxygen-containing compounds. The author believes that neither the s…
Journal of Polymer Science Part B: Polymer LettersVolume 2, Issue 2 p. 217-222 Article Polydispersity of anionically prepared block copolymers D. Freyss, D. Freyss Centre de Recherches sur les Macromolecules, Strasbourg, FranceSearch for more papers by this authorP. Rempp, P. Rempp Centre de Recherches sur les Macromo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Empirical Method for Electron Microanalysis.T. O. Ziebold and R. E. OgilvieCite this: Anal. Chem. 1964, 36, 2, 322–327Publication Date (Print):February 1, 1964Publication History Published online1 May 2002Published inissue 1 February 1964https://pubs.acs.org/doi/10.1021/a…
A simple model is used to examine the effects of preferred orientation on the parameters [sgrave]0 and k in the relationship [sgrave] = [sgrave]0 + kl −1/2 relating the tensile yield stress [sgrave] of a polycrystalline aggregate to the grain diameter l.
Abstract 1) The velocity of an air bubble ascending in water is remarkably retarded by the addition of a minute amount of sodium dodecyl sulfate (SDS) or isoamyl alcohol. With an air bubble with a radius ranging from 0.03 to 0.07 cm., the decrease in velocity is perceptible even in a 10−6 molar SDS solution, while it…
The vapor from solid yttrium sesquioxide contained in a Knudsen cell made of tungsten has been investigated by measuring the absolute effusion rate and by studying the effusate in a mass spectrometer. The latter demonstrates that the gaseous species are yttrium monoxide, oxygen, and a small amount of yttrium. Measurem…
Densification of silica glass was carried out at IS kb and 2000°C and of boron oxide glass at 20 kb and 900° C. The subsequent annealing of the densified glasses was examined at atmospheric pressure. The annealing behavior of glasses densified in the nonrigid condition is shown to be drastically different from that of…
Eggs were recovered in vivo in a modified Tyrode's solution from 29 donor gilts and transferred to 27 unmated recipients. Ovulation time of donors and recipients was synchronized. Eggs from B donors were transferred to the left oviduct or upper uterine horn, and eggs from W donors were transferred to the right side in…
Quantitative measurements of the energy dependence of the extinction distance and transmissive power for electron waves in crystals have been carried out photographically and electrically with 100-kV and 300-kV electron microscopes. The observations show that the relativistic correction for the mass of the electron mu…
By firing 3/1 mixtures of rare‐earth oxide (A 2 3+ O 3 ) and niobia or tantala (B 2 6+ O 5 ) at high temperatures, compounds of composition A 3 3+ ‐B 5+ O 7 may be prepared. The crystal structures of such compounds have been examined and two related types have been found. These are identified as a cubic defect fluorit…
Abstract Thermodynamic calculations of Δ G for all possible transformations of metakaolin at the temperature of the first DTA exothermic peak indicates that the most stable transformation is the one that yields mullite rather than γ -alumina. The energy of crystallization of γ -alumina is quite small—36,513 cal per mo…