Materials Literature
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The tensile behavior of sapphire whiskers was measured at temperatures ranging from 25–2030°C. At room temperature, the tensile strength of the whiskers is size dependent and varies from several hundred thousand psi to 1 500 000 psi. With increasing temperature the strength decreases and becomes less size dependent. T…
A synthetic crystal of mullre, 2A120 a . SiO 2, was studied by X-ray diffraction methods. The structure was found to be describable as the result of the following changes imposed upon the structure of sillmanre: re-distribution of silicon and aluminium of tetrahedral coordination into a random way over the same set of…
The elastic moduli of cadmium telluride at 25°C have been determined by measurement of ultrasonic wave velocities in the frequency range 40–300 Mc/sec. Preparation of the crystal specimens is described, and factors affecting the accuracy of results are considered. The question of possible piezoelectric stiffening and…
Durch Reduktion von Gemischen aus Platinmetallpulver und pulverförmigen Oxiden unedler Metalle mit Wasserstoff bzw. Ammoniak zwischen 900°C und 1200°C wurden folgende intermetallische Phasen erhalten: Pt3Al, Pt13Al3, Pt3Sc, Pt5Y, Pt5La; Pt15Be, Pt3Mg, Pt7Mg, Pt2Ca, Pt7Ca2, Pt5Ca, Pt2Sr, Pt3Sr, Pt5Sr; Pt7Li und Pt3Cr.…
D. C. Abbott, Analyst, 1962, 87, 286 DOI: 10.1039/AN9628700286
A high‐temperature oxide electrolyte galvanic cell of the type , , O 2 is described. Experimental data for reaction of oxygen with hydrogen‐water and methane‐water mixtures are given. Open‐circuit voltages for the hydrogen‐oxygen reaction are close to theoretical, and current‐voltage curves show that the output of the…
Recent experiments on the dc ionic conductivity of NaCl crystals doped with divalent cation impurities led to a re-evaluation of some of the basic constants for defect formation and motion in these crystals. The key parameter is the energy of motion εm of a cation vacancy. This parameter has been determined from the t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTORDERING OF THE OCTAHEDRALLY COÖRDINATED CATION POSITION IN THE PEROVSKITE STRUCTUREFrancis Galasso and Wilda DarbyCite this: J. Phys. Chem. 1962, 66, 1, 131–132Publication Date (Print):January 1, 1962Publication History Published online1 May 2002Published inissue 1 January…
The first page of this article is displayed as the abstract.
The nature of the minimum energy configuration of jogs of various lengths in dislocations in face-centred cubic metals is studied. It is concluded that long jogs of various types are partially dissociated into intrinsic stacking-fault ribbons on close-packed planes, and that elementary jogs in dislocations in a range…
Since the theoretical foundations of radial distribution analysis of liquid diffraction patterns were laid in 1927 by Zernike and Prins, progress in apparatus and experimental techniques has ensured a greater reliability and hence a greater confidence in the method as a means of evaluating the structure of liquids. A…
On calcule la polarisation de charge (ou de spin) induite en un point B dans un alliage au voisinage d'une impureté A en tenant compte de la diffusion des électrons par d'autres impuretés (réparties au hasard) entre A et B. Les applications possibles de ce calcul comprennent : 1) La discussion des facteurs de forme ma…
Existing knowledge of point defects and their interactions in uncolored alkali halide crystals is briefly reviewed. Attention is drawn to recent experimental and theoretical work which indicates that vacancy pairs are not highly mobile defects. This has important implications for some hypotheses on the kinetics of col…
The work hardening characteristics of the basal slip of magnesium have been investigated by tension test at elevated temperatures, from room temperature to 300°C, using crystals of various orientations. The resolved shear stress shear strain curves obtained typically consist of two stages. The first is the well known…
Insulating films of aluminum oxide have been prepared by evaporation of aluminum in a partial pressure of 10 −3 mm Hg of oxygen. On exposure to air both dielectric constant and dissipation factor increase to values similar to those observed for anodized films on bulk aluminum. The results can be understood if the init…
E. A. C. Lucken, J. Chem. Soc., 1962, 4963 DOI: 10.1039/JR9620004963
The first page of this article is displayed as the abstract.
In attempts to postulate dehydroxylation mechanisms for the clay minerals, three assumptions have generally been made: that the elements of water are lost more or less uniformly from all over the crystal, that the tetrahedral parts of the structure are less likely to be disturbed than are the octahedral parts, and tha…
J. P. Elder and A. Hickling, Trans. Faraday Soc., 1962, 58, 1852 DOI: 10.1039/TF9625801852
This study was made to solve the following questions: (1) Which of the three crystal forms of calcium carbonate (calcite, aragonite and vaterite) is produced most predominantly from sea water by inorganic processes. (2) Which of the chemical constituents of sea water has the greatest influence on the polymorphic forma…