Materials Literature
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The effect of pressure to 300 kbar has been measured on the volume and on the lattice parameters ($c$ and $a$) of the hcp magnesium lattice. The $a$ axis compresses in a regular manner, but the $c$ axis compresses relatively rapidly to 70 kbar, then becomes continuously more incompressible in the range 70-120 kbars, w…
Measurements of the change in thermal conductivity of high-purity single-crystal GaAs were made upon 2-MeV electron irradiation and annealing. Two GaAs samples were irradiated at maximum temperatures of 100 and 80\ifmmode^\circ\else\textdegree\fi{}K. A linear increase in the additive thermal resistivity near 50\ifmmod…
Methods for treating boundary-value problems involving helicon waves (whistlers in solids) are developed and used for infinite plates and cylinders. The magnetoplasma inside the solid is assumed to be "driven" by means of external coils, which set up an oscillatory field with sinusoidal variation along the two coordin…
Trapping levels which account for most of the thermoluminescence in natural calcite have been investigated. Results are based on a study of color centers which are shown to be closely associated with the traps involved in thermoluminescence. Optical absorption measurements in a variety of Iceland-spar crystals show th…
The independent-oscillator model fails to predict the dielectric behavior of the high-dielectric-constant materials BaTi${\mathrm{O}}_{3}$, SrTi${\mathrm{O}}_{3}$, and KTa${\mathrm{O}}_{3}$ in certain infrared-frequency regions near the three infrared-active modes. A more general classical model is proposed with mode…
Effects of sample orientation on the hydroxyl absorption of kaolinite can be interpreted in terms of the structure indicated by x-ray investigations, in which the surface hydroxyl groups of each layer are directed toward the oxygen atoms on the surface of the next layer.
Abstract A theory is proposed which enables activation energies for creep (ΔHc), and stress relaxation (ΔHs,r) to be calculated when the limiting moduli vary with temperature. The theory explains the agreement obtained by Kê between ΔHc, ΔHs.r. and the activation energy for internal friction ΔHi, f. for the grain boun…
Abstract Bei der Oxydation graphitischen Kohlenstoffs bilden sich an den Rändern der Kohlenstoffschichten saure Oberflächenoxyde (oder ‐hydroxyde bei Anwesenheit von Wasser). Mit mikrokristallinem Kohlenstoff ergab sich, daß bei der Reaktion mit Sauerstoff bei 400 bis 450°C vier Gruppen unterschiedlicher Acidität ents…
SOME of the most common failure modes of low voltage aluminum electrolytic capacitors are the result of slow chemical and electrochemical reactions on the electrode surfaces. These reactions are an inherent property of the A1/A12O3/ electrolyte system. In this paper the relationship between particular failure modes an…
Near-infrared studies indicate the a bsence or n car-absence of isolated cis and te rminal double bonds in rubber vulcanized either with or without acccleraLors, as well as in t he squ alene-sulfur r eaction product. The usc of purifi ed n atu r al rubber indicates a Jl eW a bsorption near 6.1 J1-on r eaction with s u…
In order to measure reactivity from instant to instant during reactor operation, real time computation based on reactor kinetic equations must be made. The authors developed some reactivity meters capable of such computation based on the analog computer technique. After their characteristics were checked by an analog…
Abstract The possibility that simultaneously occurring processes may account for the anomalous fractional values of the Avrami exponent found in recent polymer crystallization experiments is considered, and, on balance, rejected. A more likely explanation is that one of the assumptions used in deriving the Avrami equa…
Beschreibung von Versuchseinrichtung und Versuchsdurchführung des Blasenentwicklungsdruck-Verfahrens. Dichtemessungen an Eisen-Kobalt-Legierungen zwischen Schmelzpunkt und 1635°C. Fehlerbetrachtungen. Dichtemessungen an Eisen-Kupfer-Legierungen. Dichte und atomarer Aufbau der Metallschmelze.
Magnetization curves in the base plane and along the c-axis of natural pyrrhotite crystals (Fe 7 S 8 ) are measured up to a magnetic field strength of 90 kOe. The results can be expressed in terms of the magnetocrystalline anisotropy energy, E k =- K 0 |cos θ|+ K 3 cos 2 θ+ K 4 cos 4 θ, the last term being the correct…
The action of \I'ater o n scven p reparatio ns of t he calcium a luminorer ri te sol id solution seri es, ranging in composit ion from 6CaO 2A120 3 F e 20 a to 2CaO Fc20 a, was studi cd (a) by leaching the p owdered prcparations \\'ith water, (b) by sti rrin g in a largC' volu nll' of lI'atN at different temperatures…
Synopsis Laboratory studies have shown that a red clay soil from Nyeri, Kenya, (which occurred immediately beneath the top soil and was seasonally air dried in situ) possessed unusual properties, including an excessively high moisture sorption, increase in index values with prolonged mixing and abnormally low optimum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIrradiation Cross Linking of Polyethylene. The Temperature Dependence of Cross Linking in the Crystalline and Amorphous StatesR. Kitamaru and L. MandelkernCite this: J. Am. Chem. Soc. 1964, 86, 17, 3529–3534Publication Date (Print):September 1, 1964Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation and Crystal Data of the Cadmium Silicates CdSiO3, Cd2SiO4, and Cd3SiO5L. S. Dent Glasser and F. P. GlasserCite this: Inorg. Chem. 1964, 3, 9, 1228–1230Publication Date (Print):September 1, 1964Publication History Published online1 May 2002Published inissue 1…
This article discusses a field burial program by the National Bureau of Standards (NBS) to determine the effect of soil properties on the corrosion of the commonly used metals. During the 30‐year period between 1922 and 1952, data were obtained on 37,000 specimens of metals, alloys, and protective coatings after expos…
The characteristic temperatures and thermal expansion coefficients of MgO, CaO, MgS, CaS, and BaTe have been measured by observing Bragg reflections as functions of temperature in the temperature range from 100° to about 1000°K. The compounds selected were those for which the simple cubic approximation should be most…