Materials Literature
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A Weiss field calculation has been carried out for antiferromagnetism in more complicated structures than the usual calculation allows, and has been shown to give results more detailed and more consistent with experimental evidence on the magnetic properties of such structures than does the simpler theory.
A study is made of the effects of the presence of nuclear electric quadrupole moments on the nuclear magnetic resonance absorption in solids. Necessary theoretical background is followed by descriptions of experiments in which the spectra obtained with an r-f spectrograph, described elsewhere, are found to show marked…
Abstract A thin film or wire of metal has a lower electrical conductivity than the bulk material if the thickness is comparable with or smaller than the electronic mean free path. Previous workers have obtained expressions for the magnitude of the effect by integrating the Boltzmann equation and imposing the appropria…
Abstract Work on the oxidation of carbonaceous materials with alkaline potassium permanganate is briefly outlined and the experimental step‐wise oxidation of free carbon is described. The course of reaction as interpreted from these results is indicated. Bulk oxidation of free carbon and the nature of the products are…
Other factors being equal, the integrated intensity of a powder diffraction reflection is a function of the geometry of the source, collimator, and sample. By means of a geometrical and algebraic analysis one can predict the relative intensities to be expected with pinhole or slit collimators of different dimensions.…
Abstract Aus Molybdänmetall und MoO 3 werden im Bereich der Zusammensetzung MoO 0,10 bis MoO 2,97 Oxydgemische hergestellt und durch Erhitzen auf verschiedene Temperaturen zur Reaktion gebracht. Beim Erhitzen auf 580° werden folgende Phasen ermittelt: α‐Phase MoO 3 , γ‐Phase Mo 4 O 11 (MoO 2,75 –MoO 2,70 ) und σ‐Phase…
A complete understanding of the method of colloid agglomeration in simple cases like those illustrated here is of great help in interpreting the more complicated patterns formed on cubic ferromagnetic single crystals, especially those due to secondary domain structure, owing to the greater number of directions of easy…
A comparative discussion is given of the theories proposed by the authors on dielectric breakdown in ionic crystals.Received 17 April 1950DOI:https://doi.org/10.1103/PhysRev.79.526©1950 American Physical Society
Abstract Die Zusammensetzung von Bodenkörper und Gasphase im System Si, SiO, SiO wird untersucht. Danach werden die SiO‐Drucke gemessen, die sich bei 1050 bis 1200° C über Si und SiO 2 als Bodenkörper einstellen. Die Druckmessung erfolgt mit Hilfe der Effusionsmethode. Die Fehlerquellen dieses Verfahrens werden kurz b…
The infra-red spectrum of borine carbonyl has been investigated in the region 2 to 25μ. Two perpendicular-type bands have been partially resolved, and indicate that the molecule is a symmetric top with symmetry C3v. A normal coordinate analysis of axial WXYZ3 molecules has been carried out and applied to H3BCO, the fo…
The study of the influence of textile geometry upon textile structure performance is extended to staple-fiber yarns. Methods previously developed for continuous-filament yarns [6] are applied to determine the theoretical dependency of staple-yarn tensile characteristics upon the stress dis tribution, and modifications…
Cotto n cut in a Wiley mill to pass a 20-mesh scr ee n was ground in a vibrator y ball mill similar to one t hat has been used in German y and H olland. Con tamination of the cotton was practically elimin ated by using a chromium-plated hardened steel jar and chl'omium all oy balls. The jar holder is held by a slip ri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrecipitation of Oxalates from Homogeneous Solution. Separation and Volumetric Estimation of ZincE. R. Caley, Louis. Gordon, and G. A. SimmonsCite this: Anal. Chem. 1950, 22, 8, 1060–1062Publication Date (Print):August 1, 1950Publication History Published online1 May 2002Pub…
Experimental data indicate that cold‐setting bonds may be farmed from oxide‐phosphoric acid reactions, from phosphate‐phosphoric acid reactions, or by direct addition of liquid phosphate bond. In all cases acid phosphates are responsible for the bonding action. For optimum bonding, a weakly basic or amphoteric cation…
Abstract In Fortsetzung unserer Untersuchungen über Chalkogenohalogenide des dreiwertigen Antimons und Wismuts 1 ) wurden Kristalle folgender Selenohalogenide durch gemeinsames Tempern von Selenid und Halogenid unter Luftabschluß dargestellt: SbSeBr, SbSeJ, BiSeCl, BiSeBr und BiSeJ. Die Präparate kristallisieren in rh…
The electrostatic contribution to the lattice energy of some ordered spinels is calculated. It is made plausible that also in the case of certain spinels that do not show any long-range ordering, a considerable amount of short-range order is to be expected. As a consequence the lattice energy of ``inversed'' spinels c…
Abstract Durch gemeinsames Tempern der entsprechenden Sulfide und Halogenide des dreiwertigen Antimons und Wismuts unter Luftabschluß wurden Kristalle folgender Thiohalogenide dargestellt: Sb 4 S 5 Cl 2 , SbSBr, SbSJ, BiSCl, BiSBr und BiSJ. Die Präparate kristallisieren rhombisch‐holoedrisch mit vier Molekülen in der…
ADVERTISEMENT RETURN TO ISSUEPREVArticleThe Determination of Bond Dissociation Energies by Pyrolytic Methods.M. SzwarcCite this: Chem. Rev. 1950, 47, 1, 75–173Publication Date (Print):August 1, 1950Publication History Published online1 May 2002Published inissue 1 August 1950https://doi.org/10.1021/cr60146a002Request r…
The effects of stress on the internal structure and energy characteristics of metals are discussed with relationship to their influence on corrosion reactions. The nature and importance of residual stresses and the non-homogeneity of worked metals are emphasized. Recent concepts of the nature of grain boundaries are r…
Abstract In 2 S 3 wurde mit BeS, MgS, CaS, SrS, BaS, ZnS, CdS, HgS, SnS, PbS, TiS, VS, CrS, MnS, FeS, CoS und NiS im molaren Verhältnis 1:1 bei Temperaturen zwischen 900 und 1200° C umgesetzt. Bei sämtlichen Versuchen wurde eine Umsetzung beobachtet. Eindeutig wurde jedoch nur die Bildung der Verbindungen MgIn 2 S 4 ,…