Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Spectra and Strain in Cyclic Carbonyl CompoundsH. K. Hall Jr. and R. ZbindenCite this: J. Am. Chem. Soc. 1958, 80, 23, 6428–6432Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://pubs.acs.o…
Using neutron diffraction data, the crystal structure of gypsum has been refined by Fourier and least squares methods. The hydrogen bond distance was found to be 2.82 A rather than 2.71 A, reported previously. The hydrogen positions are consistent with those obtained from nuclear magnetic resonance. The O–H distance i…
The nonequilibrium limit of random crystallization of linear high polymers is described in this article. Expressions for crystallite size, surface area, crystallinity, and amorphous sequence distribution of crystallizable repeating units in random copolymers after cold crystallization are derived. Melting points and c…
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A metallographical investigation of manganess-aluminum system was made in the compositional range of 47% to 60% of manganese, with the results of a new hexagonal close-packed phase and a metastable tetragonal ferromagnetic phase derived therefrom. The conditions necessary for formation, structure, stability and therma…
Abstract An attractive force appears between particles suspended in solutions of macromolecules when there is neither direct interaction between two particles nor energetic interaction between particles and solute macromolecules. The magnitude of this force is of the order of the osmotic pressure of the solution of ma…
Abstract Mit Ameisensäure als Kohlenoxydquelle können ohne Druckapparatur zahlreiche verzweigte Carbonsäuren aus Olefinen, Alkoholen, Alkylchloriden oder Estern in guten Ausbeuten hergestellt werden. Die Umsetzung, die in Gegenwart von konz. Schwefelsäure stattfindet, führt bevorzugt zu tertiären Säuren, z. B. Trimeth…
Descriptions of three heavy metal stains and methods of application to tissue sections for electron microscopy are presented. Lead hydroxide stains rather selectively two types of particles in liver: those associated with the endoplasmic reticulum and containing ribonucleic acid and other somewhat larger particles. Ba…
The cross section for elastic scattering of electrons of less than 10-ev energy by free hydrogen atoms has been measured. The experimental approach was similar to that used by Bederson, Malamud, and Hammer in that a dc electron beam crossed an atomic hydrogen beam, which was chopped at a low frequency, and the signal…
The anisotropy constants of iron have been determined from torque measurements on a {100} single-crystal disk in fields up to 15 000 oersteds or higher and at temperatures of 77, 195, and 300\ifmmode^\circ\else\textdegree\fi{}K. The values of ${K}_{1}$ at the three temperatures are (520\ifmmode\pm\else\textpm\fi{}10)\…
The neutron diffraction pattern of γ-Fe2O3 indicates a cubic defect spinel structure with vacancies located at octahedral lattice sites.Received 28 July 1958DOI:https://doi.org/10.1103/PhysRev.112.1130©1958 American Physical Society
The electron paramagnetic resonance of ${\mathrm{Mn}}^{++}$ in hexagonal ZnO and CdS single crystals has been observed. The values of the crystal field parameters were obtained from the spectra and the signs of the parameters were determined from the temperature dependence of the intensities of the peaks. In addition…
A neutron diffraction study has been made of the trifluorides of $3d$ transition group elements. The arrangement of the magnetic ions and the anions in these trifluorides is similar to that in the compounds $\mathrm{La}M{\mathrm{O}}_{3}$ for which the antiferromagnetic properties have been studied earlier. No antiferr…
Abstract The spontaneous magnetization (σ0, T) of a ferromagnetic may be deduced exclusively from the determination of magnetic isothermals, or in conjunction with magnetocaloric measurements. Values of σ0, T of a nickel + copper alloy containing 30·75 at. % of copper have been obtained near its Curie temperature usin…
A single-crystal neutron-diffraction study of diaspore has been made in which the intensities of ninety reflections of the hkO and Okl zones were measured. Unitcell dimensions and their standard errors as redetermined by the x- ray powder method are a = 4.401 plus or minus 0.001, b = 9.421 plus or minus 0.004, and c =…
Abstract The dipole radiation emitted by an atom excited by a unidirectional electron beam has a nonuniform angular distribution which is simply related to the percentage polarization P of the radiation emitted perpendicular to the beam. P was first calculated using the OppenheimerPenney (O.-P.) theory. In this theory…