Materials Literature
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Yield point phenomena occur on retesting copper single crystals during interrupted tensile deformation. The effect is observed only during the linear and parabolic regions of the stress-strain curve and the size of the yield drop is directly proportional to the reduction in stress on unloading. The ratio of the flow s…
A crystallographic study on the mechanical twinning in Ti and α-U is made by a method similar to that in a previous paper, allowing more kinds of atom movements, and the twin elements, K 1 , K 2 , η 1 and η 2 , are determined. It is found that {11\bar22} and {11\bar24} twins in Ti are reciprocal to each other and that…
The temperature dependence of the crystalline anisotropy constants of iron, cobalt, and nickel is discussed. It is shown that Zener's result for iron (i.e., the first anisotropy constant varies as the tenth power of the magnetization) also may be derived from molecular field theory. In cobalt a satisfactory agreement…
Current ``domain'' theory relies heavily on Bloch walls and the Landau-Lifshitz method of assembling them. A rigorous attack on the same problem leads to a nonlinear boundary-value problem; with electronic computers available, this problem is now less formidable than when it was first formulated. Numerical calculation…
The small angle scattering of x-rays or neutrons from crystals containing a random network of dislocations is calculated. Three causes of density changes associated with dislocations are considered : that due to the elastic strain field from edge dislocations, that due to second-order elasticity effects and that due t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Vapor Pressures of Zirconium Tetrachloride and Hafnium TetrachlorideA. A. Palko, A. D. Ryon, and D. W. KuhnCite this: J. Phys. Chem. 1958, 62, 3, 319–322Publication Date (Print):March 1, 1958Publication History Published online1 May 2002Published inissue 1 March 1958http…
ADVERTISEMENT RETURN TO ISSUEPREVArticleThe Thermal Stability of Copper PhthalocyanineEmil A. LawtonCite this: J. Phys. Chem. 1958, 62, 3, 384Publication Date (Print):March 1, 1958Publication History Published online1 May 2002Published inissue 1 March 1958https://pubs.acs.org/doi/10.1021/j150561a051https://doi.org/10.…
The information available regarding the survival of freshwater algae during dry periods is somewhat meagre. Text-books (Fritsch 1935; Smith 1938, 1951; West & Fritsch 1927) refer to 'resting cells', 'cysts', 'akinetes' and 'resistant stages' but with some exceptions little appears to be known in detail about the droug…
8-Nylon zeigt bevorzugt eine monoklin entartete Gitterstruktur, bei der α = b und γ = 60° wird. Sie beruht darauf, daß an Stelle des bekannten Rostebenensystems ein räumliches Wasserstoffbrückensystem tritt. Dieses räumliche Netzwerk macht eine direkte höhere Orientierung unmöglich. Auch die triklinen Hochtemperaturmo…
Crystallographic and magnetic measurements of the system Li+xNi++1−2xNi+++xO for the entire range 0≤x<0.5 are reported. For values of x≤0.3, the lattice appears to be antiferromagnetic and is cubic above the Curie temperature. For the range of compositions 0.3<x<0.5, the lattice is rhombohedral an…
The system LaMn1−xNixO3+λ has been prepared under varying conditions for the entire range of compositions 0≤x≤1. The saturation magnetization, lattice parameters, and chemical analysis have been measured for each sample. The origin of discrepancies in the literature on the crystal structure of LaMnO3 is shown to be du…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric Phthalocyanines1C. S. Marvel and John H. RassweilerCite this: J. Am. Chem. Soc. 1958, 80, 5, 1197–1199Publication Date (Print):March 1, 1958Publication History Published online1 May 2002Published inissue 1 March 1958https://doi.org/10.1021/ja01538a045RIGHTS & PERMI…
The magnetic moments of holmium and thulium metals have been measured in applied fields of 3000-18 000 oersteds, over the temperature range of 4.2-300\ifmmode^\circ\else\textdegree\fi{}K. Holmium, paramagnetic above 133\ifmmode^\circ\else\textdegree\fi{}K, appears to be antiferromagnetic between 20\ifmmode^\circ\else\…
Summary A technique is described for the identification of clay minerals, the layers of which are difficult to expand or collapse by the usual treatment with glycerol and KCl. Samples are extracted for 3 to 6 hours in normal sodium citrate at pH 7–3 and 100° C. The citrate is renewed hourly. After the citrate extracti…
Abstract Electron micrographs of highly crystalline PTFE crystallized by slow cooling from temperatures not far above the melting point show well‐marked bands, often with striations perpendicular to the bands; optical evidence shows that the chain molecules are parallel to the striations. The structure is in marked co…
Thin magnetic films (∼1000 A) evaporated onto a heated glass substrate in the presence of a dc magnetic field develop a uniaxial magnetic anisotropy energy of the form Ek=Ksin2φ, with φ measured from the deposition field. Such films promise to outperform ferrite cores in digital-computer memory-systems by several orde…
The antiferromagnetic structures of MnS2, MnSe2, and MnTe2 have been obtained by neutron diffraction. The disulfide exhibits ordering of the ``third'' kind, the ditelluride, ordering of the ``first'' kind, and the diselenide, an arrangement which is intermediate between the two. The structures are discussed from the v…
With a view toward explaining measurements of ultrasonic attenuation in metals, the coefficient of shear viscosity of a free electron gas interacting with thermal phonons and local crystal inhomogeneities is computed. The methods employed are essentially those developed for the problem of electrical conductivity. By m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic Studies of the Reaction of Phenyl Isocyanate with Alcohols in Various Solvents1S. Ephraim, A. E. Woodward, and R. B. MesrobianCite this: J. Am. Chem. Soc. 1958, 80, 6, 1326–1328Publication Date (Print):March 1, 1958Publication History Published online1 May 2002Publis…
Untersuchungen über den Aufbau der Eisenecke des Systems Eisen–Chrom–Kohlenstoff bei Gehalten bis zu 4% C und 38% Cr. Ermittlung der Lage der Schmelzflächen, der Vierphasenebenen im Erstarrungsbereich und im festen Zustand sowie der Umwandlungspunkte mit Hilfe metallographischer, röntgenographischer und dilatometrisch…