Crystal structure of a sodium cobalt molybdate
The sodium cobalt molybdate studied here crystallizes in space group D16-Pnma of the orthorhombic system in a cell of dimensions a = 5.25, b = 10.78, 2h c 18.02 A.
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Crystallinity in isotactic polyolefins with unbranched side chains
Abstract The crystalline forms of several isotactic unbranched polyolefins in the series polyhexene‐1 to polyoctadecene‐1 have been investigated by X‐rays. Polytetra‐, ‐hexa‐, and ‐octadecene‐1 each crystallise three‐dimensionally in two forms, Types I and II. Both types give characteristic diffraction patterns and al…
Electric-Field Gradient Tensor in Ferrous Compounds
The electric-field gradient tensor at the iron nucleus in ferrous (${\mathrm{Fe}}^{2+}$) compounds is investigated. One sees that under the combined action of axial and rhombic crystalline fields and the spin-orbit interaction, the ferrous-ion $(^{5}D,3{d}^{6}){d}_{\ensuremath{\epsilon}}$ states produce a large, tempe…
Fulminen (1.2‐Benzo‐picen) im Steinkohlenteer
Abstract Ein sehr stabiler farbloser Kohlenwasserstoff, genannt Fulminen, wurde aus den höchstsiedenden Anteilen des Steinkohlenteers isoliert. Seine wahrscheinliche Konstitution ist die des 1.2‐Benzo‐picens (I).
Crystallographic study of xylan from wood
Abstract Some preparations of xylan in the form of transparent membrance or amorphous powder prepared from deciduous woods such as beech and birch show a number of Debye‐Scherrer rings at the irradiation with x‐ray. Of special interest from the crystallographic standpoint is the diffraction pattern of the membrane, wh…
Structure of Pyrophyllite
Abstract Pyrophyllite gives a diffraction pattern consisting of sharp and diffuse reflections. The unit cell for all the reflections is monoclinic with a = 5.17 Å, b = 8.92 Å, c = 18.66 Å, β = 99.8°. From the absences, the space group is either C 2/ c or Cc but there are additional absences of hkl reflections with k ≠…
Formation of stacking faults in polycrystalline silicon bronze under tensile deformation
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…
Platinum as a Thermal Conductivity Standard
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…
Crystal Spectrum and Magnetism of Tetrakis-Thiourea-Nickel Chloride
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…
Phase Relations in the System Uranium—Carbon—Oxygen
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…
Influence of pH on Corrosion and Passivation of Nickel
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…
Infrared Studies of the Hydroxyl Groups in Intercalated Kaolinite Complexes
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…
COLLAGEN METABOLISM IN THE NORMAL AND LATHYRITIC CHICK
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…
Determination of the Refractive Index of Thin Dielectric Films*
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.
Swelling Properties of Synthetic Smectites in Relation to Lattice Substitutions
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…
Behavior and Nature of Thin Oxide Films On Some Metals in Gaseous Media And in Electrolyte Solutions
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…
Polydispersity of anionically prepared block copolymers
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…
An Empirical Method for Electron Microanalysis.
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…
The effect of orientation on the grain size dependence of the yield strength of metals
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.
The Velocity of Ascending Air Bubbles in Aqueous Solutions of a Surface Active Substance and the Life of the Bubble on the Same Solution
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…