Materials Literature
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X-ray analyses of some Recent desert lacustrine sediments in Nevada, California, and Oregon show that illite and montmorillonite are the most abundant clay minerals and that chlorite and kaolinite are present in subordinate amounts in the sediments of many of the lakes. These clay suites are derived from source rocks.
The effect of electron-electron scattering processes due to Coulomb forces on the transport phenomena in nonpolar isotropic solids is treated in the framework of Kohler's variation principle. By considering the conduction electrons as a Fermi-Dirac gas of noninteracting free quasi-particles, each with charge $\ensurem…
Young's modulus was measured over the temperature range 77\ifmmode^\circ\else\textdegree\fi{}-850\ifmmode^\circ\else\textdegree\fi{}K by an accurate resonance technique. Data are presented for single crystals of aluminum oxide with various orientations of the crystallographic axes and for polycrystalline aluminum oxid…
Samples of graphite have been recovered after exposure to explosive shocks of 300,000-atm estimated intensity. X-ray and electron-diffraction examinations prove the existence of diamond in this material. The mechanism proposed for the formation of diamond under these conditions is simple compression in the c-axis dire…
Abstract A systematic investigation has been made of the effect of fatty acid composition on the compatibility of the corresponding mixed morpholides as plasticizers for vinyl chloride‐vinyl acetate copolymer resins. Plasticizer evaluation data were obtained for the morpholides of lauric, palmitic, elaidic, and epoxyo…
In the paper is discussed the stability of elastic structures which are liable to become unstable under load. In particular the behaviour of the system, comprising an elastic structure and its loading device is considered, and theorems concerning this behaviour are presented. The theorems allow considerable informatio…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Leslie S. Forster, Keith DeArmond; Luminescence of Chromium (III) Complexes. J. Chem. Phys. 1 Jun…
General expressions for the various orders of temperature diffuse scattering (TDS) for cubic elements are developed which show that the diffuse peaks at the Bragg maxima are broader for the higher order TDS contributions, and which also show that the average value of/th order TDS (in electron units per atom) isf 2 exp…
The high temperature modification of sodium ferrite, β-NaFeO 2 , has weak ferromagnetism, whose Curie temperature is about 450°C. The magnetic property resembles that of LaFeO 3 . The origin of weak ferromagnetism of β-NaFeO 2 can be attributed to the presence of the Dzyalo-shinsky type interaction in this compound.
The Ru–B and Os–B systems were investigated by x-ray powder diffraction. In addition to Aronsson's hexagonal Ru7B3 phase, two new hexagonal Ru–B phases were found: RuB2(D6h1—P6/mmm, a0=2.852 A, c0=2.855 A) and Ru2B5(D6h4—P6/mmc, a0=2.89 A, c0=12.81 A. In the Os–B system, two new hexagonal phases, isomorphous with the…
This paper describes an instrument for recording the coefficient of static friction between samples of cloth by reciprocating one sample and recording the resultant motion of the other when restrained by springs. Some test results are given for cloths of different structure and those made from yarns spun on normal and…
Fused aluminum oxide containing a small amount of nitrogen (as added aluminum nitride) showed X‐ray powder diffraction patterns similar to the δ‐alumina obtained from the calcination of alumina mouohydrate in dry air. About 1% nitrogen was adequate for complete conversion of the α phase to the δ phase. A fused mixture…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation K. Wihksne, A. E. Newkirk; Electrical Conductivities of α‐ and β‐Phthalocyanine. J. Chem. Phys. 1…
The distribution of the magnetization is calculated for a thick ferromagnetic slab with easy axis transverse to the plane of the slab in a large applied field in the plane of the slab. The calculation predicts a stable nonuniform distribution which has several features suggestive of the domain pattern to be expected i…
The rate of dissociation of oxygen in Xe–O2 mixtures was measured over a temperature range of 3000°K to 6000°K. An x-ray densitometer was used to measure the density during the dissociation process behind a shock wave. It was possible to match the experimental data with theoretical density profiles over a wide range o…
A brief outline is given of the history of wash primers with emphasis on laboratory research. A mechanism is postulated to explain the loss of adhesion with time of WP-1. Topics discussed include phase rule studies of zinc tetraoxychromate, intrinsic viscosities of recovered polymers, reactions involving formation of…
Ableitung des Zementitgitters aus dem kubisch-flächenzentrierten Gitter. Hinweise auf weitere Stützen für die dargelegte Auffassung.
Es wird ein Verfahren zur indirekten Bestimmung von Halbwertszeiten kurzlebiger gasförmiger Radioisotope beschrieben. Das Verfahren beruht auf einem zuerst von MAKOWER und GEIGER benutzten Prinzip; Voraussetzung ist, daß aus den gasförmigen Radioisotopen positiv geladene, relativ langlebige Folgeprodukte entstehen. Di…
Electron microscopic studies of sintered hexagonal ferrites have revealed growth structures which indicate that crystal growth from a relatively highly saturated vapor phase occurs above certain temperatures during the sintering process. Illustrations of variations in the growth structures at various locations in the…
A method is presented for preparing a reproducible silica glass or quartz surface that does not craze during rate of solution measurements in solutions of the five group I hydroxides. For silica glass, initial rates are a maximum at 8 M for at least NaOH and KOH and are an inverse function of ion size for the five cat…