Materials Literature
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Summary Florencite with ω 1·653, εd 1·661, G 3·45 7 , a 6·971 ± 0·004 Å, c 16·42±0·13 Å, and rhombohedral unit-cell contents Sr 0·42 Ce 0·52 Ca 0·14 Al 2·83 (PO 4 ) 1·77 (SO 4 ) 0·10 F 0·41 (OH) 5·24 (H 2 O) 0·85 occurs in the Kangankunde carbonatite in Nyasaland, and goyazite with G 3·38 6 , a 6·982±0·001 Å, c 16·54±…
Effect of prebuckling and edge-support induced stresses on the buckling of perfect cylinders
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedistribution and Reduction Reactions of AlkoxysilanesJohn W. RyanCite this: J. Am. Chem. Soc. 1962, 84, 24, 4730–4734Publication Date (Print):December 1, 1962Publication History Published online1 May 2002Published inissue 1 December 1962https://pubs.acs.org/doi/10.1021/ja0…
Transmission electron microscopy is used to observe damage in alpha -Fe foils, following irradiation of the foils to total doses of 5 x 10/sup 17/ to 1 x 10/sup 19/ neutrons/cm/sup 2/ (neutron energy above 1 Mev). The irradiations are carried out at 60 deg C. The irradiation damage can be observed directly, in the for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Determination of Silicon-Carbon and Silicon-Hydrogen Bond Dissociation Energies by Electron ImpactW. C. Steele, L. D. Nichols, and F. G. A. StoneCite this: J. Am. Chem. Soc. 1962, 84, 23, 4441–4445Publication Date (Print):December 1, 1962Publication History Published onl…
The structure of Mg(NH 4 ) 2 (SO 4 ) 2 · 6H 2 O has been redetermined in order to assign the hydrogen bonds. The crystals are monoclinic, space group P 2 1 / a , with a = 9.324, b = 12.597, c = 6.211 Å, and β = 107.14°. The structure previously reported by H ofmann has nearly correct coordinates for the Mg, S, and N a…
The ferromagnetic-resonance spectra of powders containing single-domain particles have been studied experimentally and theoretically. The theory is based on the Stoner-Wohlfarth model. The line shapes were calculated with the aid of a high-speed digital computer. Measurements were made on $\ensuremath{\gamma}$-${\math…
An X‐ray fluorescence technique has been used to study the coordination number of the aluminum ions in soda aluminosilicate glasses. The fact that the emission wavelength of the K α line of aluminum is slightly different for aluminum ions in different coordination states is utilized in this technique. Using this small…
The characteristics of tracks produced by fission fragments have been studied by transmission electron microscopy in the following layer structure materials: molybdenite (MoS2), talc, clinochlore, jefferisite, and various micas including biotite, phlogopite, muscovite, and synthetic fluor-phlogopite. The measured trac…
Abstract The direct current conductivity of three different forms of polyethylene terephthalate was studied over a wide temperature and voltage range to determine the structural dependence of the conduction process. From the films in the amorphous, crystallized, and oriented and crystallized forms it was determined th…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
An expression is derived for the flux of multiply scattered charged particles emerging from a square-edge collimating slit for a parallel beam at normal incidence. Full allowance is made for the continuous energy loss in the slit material, and the results are compared with those from Courant's theory. The effective in…
The effect of additives on the properties of lead titanate was investigated. The additives employed were selected on the basis of potential solid solution or liquid formation with PbTiO 3 during sintering. Most of these additives aided sintering and produced dense polycrystalline specimens of PbTiO 3 with densities in…
A new method, based on second-order elasticity, has been developed to predict departures from Vegard's law in binary alloy systems in which the end members have similar outer-electronic structures. This method has been found to be successful in predicting the correct sign and order of magnitude of the deviation in 28…
Abstract 1) When calcium carbonate was formed in the laboratory from the calcium bicarbonate solution through which carbon dioxide gas had not been bubbled during the process of the calcium carbonate formation: a) Only calcite was formed at a temperature below 25°C; aragonite was formed above 25°C, and vaterite was fo…
The sessile‐drop method for the evaluation of wetting is discussed in terms of forces acting on the liquid drop. For acute angles, or wetting of the solid, the driving force is the lowering of the solid‐gas surface energy by the liquid. Contact angles of approximately 25° and less, obtained under appropriate condition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTON THE LOW-FREQUENCY DIELECTRIC DISPERSION OF COLLOIDAL PARTICLES IN ELECTROLYTE SOLUTION1H. P. Schwan, G. Schwarz, J. Maczuk, and H. PaulyCite this: J. Phys. Chem. 1962, 66, 12, 2626–2635Publication Date (Print):December 1, 1962Publication History Published online1 May 2002…
A theory is derived for impurity-controlled dislocation mobility and the resultant temperature variation of the flow stress of lithium fluoride. The theory is suitable to crystals in which the hardening is primarily due to tetragonal lattice distortions such as result from the introduction of magnesium into lithium fl…
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