Materials Literature
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ONE of the challenging new problems which has come into being with the rather sudden outgrowth of the atomic energy industry from the laboratory stage is concerned with the ultimate disposition of the radioactive wastes or by-products of that industry. The splitting of the uranium atom or other fuel used in nuclear ch…
Abstract The phenomenon of swelling is associated with the hydration of clay; however, all clays do not swell when hydrated. Steps in the mechanism of hydration and swelling of different types of clays as observed and interpreted by several investigators and some theories proposed as to the cause of hydration and swel…
The laws of heat flow and methods of measuring thermal conductivity are considered. The effects of crystalline nature, impurities, lattice imperfections, grain boundaries, porosity, mixtures, and temperature on thermal conductivity are discussed. There are insufficient reliable data to assess quantitatively the effect…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
The effect of pressure on the Curie temperature has been measured for 13 ferromagnetic materials, comprising 4 elements (Fe, Co, Ni, Gd), 7 metallic alloys, a ferrite, and a perovskite. Curie points ranged from 16\ifmmode^\circ\else\textdegree\fi{}C (Gd) to 1120\ifmmode^\circ\else\textdegree\fi{}C (Co), and pressures…
It is proposed that the luminescent center in ``self-activated'' ZnS consists of a cation vacancy whose nearest surroundings have lost one electron. Such a center is consistent with the fact that at low firing temperatures, the appearance of the blue fluorescence of self-activated ZnS depends upon the presence of ``pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Method for Growing Barium Titanate Single CrystalsJ. P. Remeika and W. Morrison JacksonCite this: J. Am. Chem. Soc. 1954, 76, 3, 940–941Publication Date (Print):February 1, 1954Publication History Published online1 May 2002Published inissue 1 February 1954https://doi.org/1…
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The effect of isometric approximately spherical pores and anisometric cylindrical pores on the thermal conductivity of alumina, graphite, and nickel has been investigated. Pore orientation is found to affect profoundly the thermal conductivity for a given porosity. At temperatures below about 500°C. the conductivity o…
The expression u=cr/r3, (where c is a constant) sometimes assumed for the displacement around a point imperfection (interstitial or substitutional impurity, lattice vacancy) gives a nonzero stress at the surface of the solid. The additional ``image displacement'' necessary to insure that this stress vanishes is usuall…
Abstract An electrical capacitance method of estimating the water‐uptake of paint films on metal immersed in sea‐water has given, for many paint formulations, values agreeing with those obtained by a gravimetric method. For a few paints, however, pronounced disagreement was shown between values obtained by the two met…
Abstract Es wird der Stand der technologischen Entwicklung der Silicone in Deutschland gezeigt und auf sich abzeichnende Entwicklungen hingewiesen. Auf manchen Gebieten bilden Kieselsäureester und Polykieselsäureester eine interessante Ergänzung des technologischen Bildes der auf Polysiloxan‐Verknüpfungen aufgebauten…
Abstract Cylindrical test samples were compressed statically and dynamically at temperatures ranging from +100 to -195°C and the yield stress, form of yield and surface markings observed. A Hopkinson bar and throw -off rod and electric resistance strain gauges were used for stress determinations under dynamic loads. T…
The influence of additions of 30 and 40 percent of nickel on thermal expansion in the range from 10° to 50°, rigidity modulus at 20° and its temperature coefficient in the range from 20° to 50°, of alloys of cobalt, iron and chromium has been determined. The relations between those properties of nickel-added alloys an…
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