Materials Literature
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We develop a model of superexchange interactions in W-hexagonal ferrites. We analyse all possible interactions and classify the exchange energies from structural considerations. The spin configuration deduced from the model is in agreement with experimental results. Finally, the effect of preferential substitutions on…
The dielectric behavior of (1‐ x )(Sr 0.5 Pb 0.25 Ca 0.25 ) TiO 3 ‐x(Bi 2 O 3 ·3TiO 2 ) was studied using x=O to 8.25 mol%. Around the point at which x equals 1.56 mol%, the following phenomena were observed: (1) At −;22°C, the weak field permittivity increased substantially with a dc bias field, becoming more than tw…
Recent redetermination of the melting curve of albite, NaAlSi3O8, has raised questions about possible nonequilibrium states in viscous silicate liquids near their liquidus temperatures and about the thermodynamic description of albite melt at high P and T. Solid solubility of excess nepheline in albite, and of excess…
The diffusion of Cs + , Rb + , and K + ions was measured in three grades of vitreous SiO 2 by the radiotracer‐sectioning technique or Rutherford, backscattering spectroscopy. The values of the diffusion coefficient, D , at 1000°C decrease strongly with increasing ionic radius, changing by about two and one‐half orders…
Abstract The spectra of the creation of long‐lived Frenkel defects (F, H and α, I pairs) by 7.5 to 9.0 eV photons and the thermal annealing of defects created at exciton decay or at the recombination of electrons with holes are measured in KCl crystals by the luminescence methods at 4.2 K. Pairs of defects with variou…
Magnetic and thermal properties of Co100−xTax(11≤x≤25) and Co100−xWx(13≤x≤25) amorphous films deposited by rf diode sputtering have been investigated. In both systems, structural changes of these films from crystalline to amorphous lead to a drastic decrease of their coercive force Hc and the absolute value of saturat…
New CaO‐P 2 P 5 glass ceramics were prepared by crystallizing glass rods or plates unidirectionally in a temperature‐gradient furnace. The unidirectionally crystallized glass showed extremely high bending strength (∼500 to 600 MN/m 2 ) even when subjected to a severe abrasion treatment with Sic paper. Scanning electro…
The deterioration of polyethylene and polyvinyl chloride cable materials in the containment building of an operating nuclear reactor has been investigated. Since the maximum dose experienced by the cable materials was only 2.5 Mrad during ∼12 yr of operating life, the extent of material degradation was surprising. Lab…
Loss separation measurements were made on regular grain oriented 3% Si steels of four sheet thicknesses, one thickness of high permeability oriented 3% Si steel, two grades of nonoriented Si steel, a low carbon steel, a primary recrystallization oriented low alloy iron sample, and an amorphous metal sample. The Bn dep…
An H 3 PO 4 –H 2 O 2 –H 2 O solution is studied for possible use in the etching of germanium. The solution can be roughly classified into two ternary regions according to its etching characteristics: a (with a low H 2 O 2 concentration) and b (with a high H 2 O 2 concentration). Solutions in region b provide reproduci…
The variation in the magnetic hysteretic properties of rf-sputtered amorphous Tb–Fe thin films as a function of the nominal film thickness was investigated, using Kerr magneto-optic and Hall effect measurements. The results on the thickness dependence of coercivity, polarity of the hysteresis loop, and Curie temperatu…
It is well known that a two-dimensional (parallel plate configuration) bootlace lens can be designed to have more than one focal point. Wide angle scanning capabilities of these lenses in two dimensions is well established, being larger for higher number of focal points. However, no three-dimensional bootlace lens hav…
A mathematically closed form expression for the electric field between arbitrarily shaped surfaces is derived utilizing the techniques of differential geometry. This solution is then applied to the problem of Fowler-Nordheim emission from non-planar surfaces. Knowledge of the field everywhere on the emitting surface a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic Jahn-Teller effect in a manganese(III) complex. Synthesis and structure of hexakis(urea)manganese(III) perchlorateHossein Aghabozorg, Gus J. Palenik, R. Carl Stoufer, and J. SummersCite this: Inorg. Chem. 1982, 21, 11, 3903–3907Publication Date (Print):November 1, 19…
Thin metallic films have reduced conductivity when thickness is not larger than electron mean free path, a phenomenon studied by Lord Thompson. Formulas given by Liao are valid for small thickness; a general formula is available for all ranges of film thickness. The result is in terms of an exponential integral which…
Abstract The effect of tetrasodium pyrophosphate decahydrate (Na4P2O7·10H2O) as a nucleation catalyst for sodium acetate trihydrate (CH3CO2Na·3H2O) is shown. The supercooled melt of 10 g of CH3CO2Na·3H2O recrystallized at about 5 degrees below the melting point only when 0.1 g of Na4P2O7·10H2O was added to it. More th…
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Age-related differences of human skin collagen in solubility, susceptibility to pepsin digestion, and the spectrum of collagen molecules were systematically examined. Less than .5% of the skin collagen were solubilized in a neutral salt solution. The solubility in acetic acid decreased rapidly during maturation and th…
A new modification of the diamond anvil pressure cell was made for high-temperature and high-pressure use. After this modification, a high temperature of up to 700°C could be obtained at a pressure of up to 7 GPa. Various sensor materials for pressure measurement at high temperatures were also investigated. It was fou…
The magnetic characteristis of cores with step-lap joints are analyzed by using the finite element method taking into account eddy current and magnetic saturation. The effects of the following factors on the magnetic characteristics such as flux and eddy current distributions and magnetizing current are clarified quan…