Materials Literature
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When graphite is bombarded in a nuclear reac tor ' there is a s teady deteriorat ion of the structure with product ion of interstit ial atoms, giving an increase of c dimension and decrease of a. Over a wide range of irradiation the parameter changes are linear wi th the dose. The amount of damage decreases wi th incr…
The effect of speed of evaporation, pressure, thickness, and age on the reflectance of evaporated Al films was investigated in the extreme ultraviolet from 900 A to 2200 A. High speed of evaporation was found to be the most important factor in producing Al films of highest ultraviolet reflectance. By changing the evap…
Abstract Long spacing order in the fiber axis direction is found for the majority of viscose rayon yarns, varying in repeat spacing from about 170 to 220 A. This order is interpreted as a regularity of crystallite placement such that the crystallites themselves act as diffracting centers to form a line lattice with lo…
Abstract The intensities of crystalline and amorphous infrared bands of 66 and 610 nylon films were plotted against density. The curves were extrapolated to zero intensity to give revised values for the amorphous and crystalline densities which are probably more accurate than those previously used. The amorphous densi…
Thermal‐expansion data from room temperature to 1500°C. are given for a number of ceramic materials. Determinations were made with telemicroscopes on bars or rods 7 in. long
The infrared absorption spectra of LaBO3, InBO3, and ScBO3 have been observed as crystalline powders in the wavelength range from 7 to 20 microns. The borates had a B10/B11 ratio varying from the natural abundance (18/82) up to about 96/4. The four fundamental frequencies for B10 fell within the ranges, ω1 = 939, ω2 =…
The fictive temperature formalism, in which the structural state of the glass is characterized by the fictive temperature T , is very useful in the qualitative description of the effects of thermal treatment in the transformation range. Experimental data are presented which show, however, that such a one‐parameter des…
The resistivity, thermoelectric power, and magnetic susceptibility of metallic solid solutions at room temperature are reviewed, and their relation with their electronic structure emphasized. The special properties of transitional impurities are related to the emptying of their d shells.
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El empleo de molino vibrante permite reducir en 50-60ºC la temperatura de cocción, reducir la tendencia al agrietamiento del vidriado y conseguir que éste sea más opaco.
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The magnetic technique of particle size measurement based on the work of Elmore consists of a comparison of a modified Langevin curve with the observed magnetization curve for an appropriate system of ferromagnetic particles. The average magnetic moment per particle is obtained from this analysis, and the average part…
Abstract An investigation has been made of occlusion of O2, A and N2, and of CH4, C2H6, C3H8, n- and iso-C4H10, n-, iso- and neo-C5H12, n-C6H14, n-C7H16, n-C8H18 and iso-C8H18 within the crystal lattice of dehydrated synthetic faujasite (Na2O. Al2O3. 2·67SiO2. mH2O). The three permanent gases are selectively occluded…
Abstract The absorption spectra of eight type I and three type IIa diamonds irradiated with neutrons, electrons or y-rays have been recorded at 80 and 290°K after various heat treatments in the temperature range 0 to 900°C. It is found that heating in the range 350 to 450°C causes a general reduction in the irradiatio…
For the purpose of studying the relation of magnetostriction to technical magnetization, we used a strain gauge to measure the magnetostriction of long rod single crystals of 3.2% Si-Steel, and compared the results with those which had formerly been obtained on the same samples by using a mechano-optical lever. The la…