Materials Literature
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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…
Peptide-forming reagents have been Applied to wool in an attempt to convert "salt links" into amide cross-links. Wool which has been modified with biscyclohexyl carbodi imide is almost unchanged in weight, handle, and appearance but has increased resistance to attack by alkali, alkaline thioglycollate, urea-bisultite,…
The specific heats of glasses reported in the literature since 1951 were studied in relation to the Sharp‐Ginther equation. It was found necessary to change the factors previously furnished for K 2 O and B 2 O 3 . The other factors were found to be satisfactory when compared with the new measurements. It was discovere…
Abstract Measurements have been carried out on the equilibrium between ferrous and ferric iron in wüstite containing various amounts of magnesium oxide, at various partial oxygen pressures and 1400 °C. These data, together with the data of Darken and Gurry [2] for the pure wüstite, are used for a discussion of the app…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChelates of Violuric AcidPeter A. Leermakers and William A. HoffmanCite this: J. Am. Chem. Soc. 1958, 80, 21, 5663–5667Publication Date (Print):November 1, 1958Publication History Published online1 May 2002Published inissue 1 November 1958https://pubs.acs.org/doi/10.1021/ja0…
The temperature dependence of the microhardness of the quartz structures of both SiO 2 and the isomorphous compounds AlPO 4 , GeO 2 , and LiAlSiO 4 has been examined. Particular attention has been given to the effects of the high‐low inversion, which has been found to be anomalous relative to the behavior of other pol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the Schardinger Dextrins. X. The Interaction of Cyclohexaamylose, Iodine and Iodide. Part I. Spectrophotometric Studies1John A. Thoma and Dexter FrenchCite this: J. Am. Chem. Soc. 1958, 80, 22, 6142–6146Publication Date (Print):November 1, 1958Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange and Diffusion of Oxygen in Crystalline Cuprous OxideWalter J. Moore, Yukiko Ebisuzaki, and James A. SlussCite this: J. Phys. Chem. 1958, 62, 11, 1438–1441Publication Date (Print):November 1, 1958Publication History Published online1 May 2002Published inissue 1 Novem…
The effect of impurities is inexplicable by the accepted theory of crystal growth. In this report a mechanism is presented which describes the specific action of crystal-growth poisons. By this model the step motion in growth is hindered and nucleation rate on an ideal surface is increased. To rationalize the effect o…
On the faces of a type I diamond octahedron of particularly good quality there have been observed clusters of trigons which appear to be associated with a centre of strain in the interior of the stone. The trigon patterns show features which can only have been the result of surface dissolution. These observations are…
The structure of the conduction band of Ge is completely taken into account in calculating the cross section in second-order Born approximation. The second-order matrix element contains first-order matrix elements of electron-photon interaction (derived for anisotropic mass) and of electron-scatterer interaction. Scat…