Materials Literature
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Neutron diffraction measurements confirm that MnP is ferromagnetic between 50° and 291°K, with 1.3 μB/Mn atom directed along [001] of the orthorhombic Pbnm cell. Previous measurements at low temperatures indicated that the compound was metamagnetic; neutron diffraction measurements in zero magnetic field reveal a modu…
Abstract Copolymers of vinyl acetate and vinyl alcohol were studied by differential thermal analysis. The melting points of the copolymers are not a simple function of the composition, but depend on the method of preparation of the copolymers. Partial saponification of poly(vinyl acetate) with sodium hydroxide leads t…
Crystallization rates were measured in vacuum, dry nitrogen, and water‐saturated nitrogen atmospheres from 1300° to 1540°C. In all cases the observed rates were linear. Three reactions appeared to contribute to crystallization: the intrinsic crystallization, the impurity effect of H 2 O vapor, and furnace contaminatio…
Abstract In further work on the vacuum pyrolysis of cotton cellulose, alone or with flame‐retardants, at temperatures usually near 420°, products have been identified and determined. In the tar, laevoglucosan has been determined by an infra‐red absorption method, and by gas‐liquid chromatography of its trimethylsilyl…
A study has been made of the magnetic properties of the spinels ACr2X4, where A is diamagnetic zinc or cadmium, and X is oxygen, sulfur, or selenium. CdCr2Se4 and CdCr2S4 are apparently ferromagnetic with moments somewhat below the predicted value of 6.0 μB/molecule. By contrast, ZnCr2Se4 and ZnCr2S4 are antiferromagn…
The plate buckling of woven fabrics is analyzed in terms of the known non-linear bending behavior of such fabrics. A simplified form of this non-linearity is found to explain the behavior of the fa...
In many oxides the outer d electrons are not localized, magnetic electrons but collective, metallic electrons either as a result of cation-sublattice band formation or of covalent mixing of anion p and cationic d states. It is shown that cation-sublattice band formation does not take place in oxides with ReO3 or perov…
Summary A review is given of the literature on organic glasses with special reference to sugar glasses. The amorphous sugar glasses in boiled sweets, milk powder, ice cream and certain freeze‐dried products are then discussed. Breakdown of these sugar glasses can lead to defects in all four cases.
In this paper it is shown that a combined investigation of the magnetic and the semiconducting properties of the solid solutions of LaMnO3 and LaCoO3 is necessary for a complete understanding of this rather complicated system. The conductivity gives information on the valency states of the ions and with this knowledge…
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Europium titanate has the cubic perovskite structure containing divalent Eu (7 μB) and tetravalent Ti. From magnetic measurements we find that EuTiO3 is one of the few antiferromagnetic materials with a positive θ (TN=5.3°K, θ=3.8°K). At 1.3°K the magnetic moment (σ) increases linearly with field to 10 kOe; above 14 k…
Previous measurements of the critical temperature (Tcrit) for the first-order antiferromagnetic-ferromagnetic transition in FeRh as a function of magnetic field have established that the total entropy change at the transition (ΔS) is much larger than the estimated change in lattice entropy (ΔS)lat. This study has now…
THIS BOOK gives an introduction to the hydrodynamics of inviscid fluids and is, after the preliminary chapters, mainly concentrated on two-dimensional motions.There is a full treatment of the general two-dimensional motion of an immersed cylinder with particular reference to the flow past a thin airfoil and past an in…
Ferroelectricity and weak ferromagnetism have been found to set on simultaneously in Ni3B7O13I at about 64°K. This is evidenced by dielectric hysteresis, spontaneous Faraday effect, quadratic magnetoelectric hysteresis, etc. The strong coupling between the mutually perpendicular spontaneous polarization—[001]—and spon…