Materials Literature
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The increase in linear dimensions of a 99.999% copper foil upon deuteron irradiation was measured directly as a function of integrated flux. Two bombardments were made on the same specimen with integrated fluxes of 3.14\ifmmode\times\else\texttimes\fi{}${10}^{16}$d/${\mathrm{cm}}^{2}$ and 7.68\ifmmode\times\else\textt…
A study has been made of the magnetic properties of the system of quenched magnesium ferrites (MgxIIFe1−xIII) · (Mg1−xIIFe1+xIII)O4, where x, the fraction of magnesium ions in tetrahedral sites, varies from 0.14 to 0.26. Included among the properties examined are: saturation moment, Curie point, initial permeability,…
Line broadening because of crystalline anisotropy and the random orientation of the crystallites is investigated for the case in which the anisotropy field is much larger than the saturation magnetization. The theory predicts an absorption line with shoulders on each side which correspond to grains in which a hard or…
The uniaxial magnetic anisotropy induced in iron-nickel alloys by a magnetic anneal has been determined as a function of the composition, annealing temperature and duration. It was found that the result is consistent with the Néel-Taniguchi theory.
The magnetocrystalline anisotropy constant (K1) and saturation magnetization (Ms) of magnesium-iron ferrite monocrystals containing 6 to 50 mole percent magnetite were measured as a function of temperature (T) and ionic distribution. For crystals containing 6 to 25 mole percent magnetite, K1 was found to vary more rap…
The model of the bands recently proposed by Slonczewski and Weiss for graphite single crystals is described in some detail. It is then applied to a study of the cyclotron resonance absorption in graphite, taking into account plasma effects. This theory is then compared to the recent experimental data of Galt et al. Th…
Abstract The elastic modulus of highly oriented crystalline polymers is discussed in terms of a series model. As has been shown previously, if a polymer has fully extended chain configurations within the crystalline regions, the modulus of this phase may be expected to be high. In this case the macroscopic elastic mod…
Abstract It is shown that synthetic rubbers, in contrast to natural rubber, can be vulcanized to soft rubber by a simple thermal treatment without any previous admixture of sulfur or accelerators. This process has been designated as “Thermovulcanization” to distinguish it from the regular vulcanization procedure under…
Abstract Measurements are described of the rate and final extent of crystallization at a temperature of −25°C. in natural rubber which has been modified by the chemical combination of sidegroups to the rubber molecule. The substances added were six thiol acids. Their efficiencies in retarding crystallization are compa…
Past attempts to describe the d electrons of the transition metals have been based on one or the other of two extreme views: the one, the conduction-band model, treats the d electrons as though they belong to the lattice as a whole rather than to particular atoms; the other, the shell model, treats the d electrons as…
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…