Materials Literature
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Abstract Styrene has been grafted onto cellulose in the form of cotton linters, cotton cloth, and rayon by ionizing radiation. Styrene was brought into intimate contact with cellulose by extension of the “inclusion” technique of Staudinger and Krässig, and graft copolymers were prepared by exposure to high energy elec…
The magnetization and electrical resistivity of the ordered alloy MnRh were measured during a complete temperature cycle between 4.2° and 700°K. At all temperatures the magnetization is proportional to field. From 700°K down to about 170°K, the susceptibility rises according to a Curie-Weiss relation, χ=C(T−θ)−1, wher…
The thermodynamics of magnetic processes in several compounds undergoing ferro- or ferrimagnetic to antiferromagnetic transitions are studied using critical field-transition temperature data obtained with a miniature-coil, pulsed-field technique. The zero-field transition entropy change in each material is calculated…
The phenomenon of rotatable anisotropy (RA) in Ni–Fe films refers to a reorientation of the easy axis along the direction of a previously saturating magnetic field in a time <1 sec at room temperature. The effect was first unambiguously observed by Lommel and Graham in Ni films and attributed by them to ferroma…
The spatial distribution of the covalent spin density in MnF2 has been obtained from a measurement of the ``forbidden'' magnetic scattering in the nuclear reflections using polarized neutrons. A partial Fourier map of the projected covalent spin on the basal plane was prepared. A model representing the covalent spin b…
Recently the lateral width of the cellulose microfibril has been estimated as 30 A rather than about 150 to 200 A, by extrapolation of data from model shadowing experiments. The difference was attributed to a layer of metal deposited during shadowing. However, direct photographs of the same microfibrils parallel and p…
Results from an experimental study on rayon and nylon tire cords embedded in rubber are reported. Stress-strain curves in tension and compression on thick-walled cylinders of such materials show that much higher moduli of elasticity are exhibited by cords under tension than by cords in compression. However, the compre…
The magnetic moments and susceptibilities of the piezoelectric-ferromagnetic compounds Ga2−xFexO3 have been measured over a temperature range from 4.2° to 350°K. The saturation moment at 0°K and the Curie temperature follow a linear compositional relationship. The magnetic properties of these compounds are sensitive t…
Magnetic field induced magnetoelectric (ME) effects in Cr2O3 and (Cr2O3)0.8·(Al2O3)0.2 have been examined with an ac method as a function of temperature and magnetic field. The ME effect parallel to the c axis reverses in sign at low temperatures for both materials, and is linear in H for all temperatures up to the sp…
A new apparatus for the investigation of the dynamic friction of fabric is described. The apparatus is designed so that frictional forces may be recorded as a function of the orientation of the fabric relative to a specified direction. Most of the experimental data have been obtained for the friction of a fabric on it…
Abstract From x‐ray diffraction data, a pseudohexagonal unit cell with a = b = 14.94 A. and c = 7.93 A. has been obtained for partially dried precipitate of amylose and tertiary butyl alcohol. Geometrical considerations establish a helical amylose configuration which has seven glucose residues per helix turn.
The three-body recombination of O atoms by Ar catalysts was measured over a temperature range of 1340–2920°K in a shock-tube experiment. The excess amount of O atoms was produced by shocking dilute O3–Ar mixtures. Under the experimental conditions, the O atoms in excess of equilibrium produced by the reaction O3+M→O+O…
Extensive covers of epilithic diatoms seldom develop on intertidal substrates in southern Oregon in the presence of grazing animals and macroscopic algae. If an area is cleared, however, a brown coating of diatoms often appears in 2 to 3 weeks, but the density depends on the season and the local conditions during tida…
This paper presents an analysis of an idealized polyphase hysteresis machine. The distributed magnetic field within the machine is described in terms of dimensions and windings. A single-phase equivalent circuit is developed for the machine and expressions are given for the parameters of this equivalent circuit and fo…
The magnetocrystalline anisotropy constants of Gd have been measured from 10° to 350°K. The behavior near the Curie temperature (about 300°K) is unusual: a fairly large, strongly field-dependent apparent anisotropy persists to temperatures at least 30° above the Curie temperature, and in the range 250° to 285°K this a…
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 H. Blank, S. Amelinckx; DIRECT OBSERVATION OF FERROELECTRIC DOMAINS IN BARIUM TITANATE BY MEANS O…
Liquidus surfaces of two planes, one with 4.5 percent acmite and 4.5 percent sodium metasilicate and the other with 8.3 percent acmite and 8.3 percent sodium metasilicate in the system NaAlSi ~3~ O ~8~ -KAlSi ~3~ O ~8~ -SiO ~2~ -H ~2~ O (P ~H2~ O = 1000 kg/cm ^2^ ) were determined. The minima on the two liquidus surfa…
Abstract The potential energy of polyethylene, polytetrafluoroethylene, polyoxymethylene, polyisobutylene, polyvinylidene chloride, and isotactic polypropylene with a helical conformation has been calculated as a function of the angles of rotation around the bonds of the backbone chain. The use of appropriate function…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of Discrete Eight-Coördination. II. The Crystal and Molecular Structure of Zirconium(IV) AcetylacetonateJ. V. Silverton and J. L. HoardCite this: Inorg. Chem. 1963, 2, 2, 243–249Publication Date (Print):April 1, 1963Publication History Published online1 May 2…
Barium ferrite platelet-shaped particles have been prepared with a diameter of 0.1 microns, which is an order of magnitude smaller than those obtained by conventional sintering and regrinding techniques. The preparation technique used has been optimized to produce the complete ferrite with σs=68 emu/g. Due to the smal…