Materials Literature
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A simple model is used to examine the effects of preferred orientation on the parameters [sgrave]0 and k in the relationship [sgrave] = [sgrave]0 + kl −1/2 relating the tensile yield stress [sgrave] of a polycrystalline aggregate to the grain diameter l.
Abstract 1) The velocity of an air bubble ascending in water is remarkably retarded by the addition of a minute amount of sodium dodecyl sulfate (SDS) or isoamyl alcohol. With an air bubble with a radius ranging from 0.03 to 0.07 cm., the decrease in velocity is perceptible even in a 10−6 molar SDS solution, while it…
The vapor from solid yttrium sesquioxide contained in a Knudsen cell made of tungsten has been investigated by measuring the absolute effusion rate and by studying the effusate in a mass spectrometer. The latter demonstrates that the gaseous species are yttrium monoxide, oxygen, and a small amount of yttrium. Measurem…
Densification of silica glass was carried out at IS kb and 2000°C and of boron oxide glass at 20 kb and 900° C. The subsequent annealing of the densified glasses was examined at atmospheric pressure. The annealing behavior of glasses densified in the nonrigid condition is shown to be drastically different from that of…
Eggs were recovered in vivo in a modified Tyrode's solution from 29 donor gilts and transferred to 27 unmated recipients. Ovulation time of donors and recipients was synchronized. Eggs from B donors were transferred to the left oviduct or upper uterine horn, and eggs from W donors were transferred to the right side in…
Quantitative measurements of the energy dependence of the extinction distance and transmissive power for electron waves in crystals have been carried out photographically and electrically with 100-kV and 300-kV electron microscopes. The observations show that the relativistic correction for the mass of the electron mu…
By firing 3/1 mixtures of rare‐earth oxide (A 2 3+ O 3 ) and niobia or tantala (B 2 6+ O 5 ) at high temperatures, compounds of composition A 3 3+ ‐B 5+ O 7 may be prepared. The crystal structures of such compounds have been examined and two related types have been found. These are identified as a cubic defect fluorit…
Abstract Thermodynamic calculations of Δ G for all possible transformations of metakaolin at the temperature of the first DTA exothermic peak indicates that the most stable transformation is the one that yields mullite rather than γ -alumina. The energy of crystallization of γ -alumina is quite small—36,513 cal per mo…
Abstract The nature of pyridine adsorption by acid- and base-saturated montmorillonite from Otay, California (A.P.I, no. H-24) was studied by infrared adsorption. The spectrum for chemisorbed pyridine was found to be distinctively different from physically adsorbed pyridine; the latter gave a spectrum very similar to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParticle Interactions in Aqueous Kaolinite DispersionsA. S. Michaels and J. C. BolgerCite this: Ind. Eng. Chem. Fundamen. 1964, 3, 1, 14–20Publication Date (Print):February 1, 1964Publication History Published online1 May 2002Published inissue 1 February 1964https://pubs.acs…
Properties of a metastable ferroelectric NaNbOa phase are described. This ferroelectric phase was induced by the application of a field greater than 50 kv per cm at a temperature in excess of 100°C. The ferroelectric state was evidenced by a spontaneous polarization of the order of 30 microcoulombs per cm2 and by fair…
The thermal conductivity of titanium carbide, zirconium carbide, and titanium nitride was measured by a variety of techniques in the temperature range 200° to 2000° C. The titanium nitride results are a factor of four higher than the previously published values at 1000°C and show a positive temperature coefficient for…
Abstract Chemical composition, X-ray diffraction and other analytical data of a series of samples of clays that are composed essentially of illite are presented. The physical properties of these samples are given and related to variations in the composition and character of the illites. Data indicate that these illite…
A general mathematical technique for the solution of moiré patterns produced by the overlapping of two figures is presented. The technique is applied to combinations of figures involving parallel lines, radial lines, and concentric circles including those in which the spacing is variable. When an equispaced parallel l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure Relations in Mixed Metal OxidesLewis Katz and Roland WardCite this: Inorg. Chem. 1964, 3, 2, 205–211Publication Date (Print):February 1, 1964Publication History Published online1 May 2002Published inissue 1 February 1964https://pubs.acs.org/doi/10.1021/ic50012a013h…
The high‐temperature transition monoclinic tetragonal in the rare‐earth tantalates and niobates with the formula AB04 was investigated using a high‐temperature X‐ray diffractometer. The transition was reversible and proceeded by a gradual change in symmetry. The temperature of the first appearance of the tetragonal ph…
The direct and converse piezoelectric effects have been observed in the Achilles tendon of ox and horse, which consists of collagen fibers in which the collagen molecules are highly orientated and crystallized. The matrix of piezoelectric constant is concordant with that derived for and unidirectionally oriented syste…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParticle to Particle Migration of Hydrogen Atoms on Platinum—Alumina Catalysts from Particle to Neighboring ParticlesS. KhoobiarCite this: J. Phys. Chem. 1964, 68, 2, 411–412Publication Date (Print):February 1, 1964Publication History Published online1 May 2002Published inis…
The stability of the shape of a moving planar liquid-solid interface during the unidirectional freezing of a dilute binary alloy is theoretically investigated by calculating the time dependence of the amplitude of a sinusoidal perturbation of infinitesimal amplitude introduced into the planar shape. The calculation is…
CONTENTS I. Oxidation in gas and liquid phases 13 II. Oxidation in the solid phase 14 III. Oxidation of polypropylene 15 IV. Critical antioxidant concentration 18 V. Initiation of oxidation by antioxidants 20 VI. Theory of synergism 21 VII. Free radicals as stabilisers 23 VIII. Borate stabilisers 25