Materials Literature
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Mixtures of magnesia and silicic acid ranging in composition from 0.5 to 2.0 M/S were treated hydrothermally at temperatures of 75° to 350°C. for various periods of time. The reaction solids were examined by differential thermal analysis, X ray, and electron microscopy and analyzed chemically. The intermediate product…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrolytic Transference Properties of PolyphosphatesFrederick T. Wall and Robert H. DoremusCite this: J. Am. Chem. Soc. 1954, 76, 3, 868–870Publication Date (Print):February 1, 1954Publication History Published online1 May 2002Published inissue 1 February 1954https://pubs.…
The results of previously published investigations into the thermal conductivities of alumina, magnesia, and beryllia by five different methods in different temperature ranges are summarized in the empirical equation k = A/(T − 125) + 8.5 × 10 −36 T 10 , where A = 16.2 for alumina, 18.8 for magnesia, and 55.4 for bery…
The infrared spectra of thin films of H2NOH and D2NOD were obtained at — 78° and — 190°C in the region 4000—500 cm—1. Two distinct types of spectra resulted depending on whether the films were formed at — 78° or at — 190°C. The spectra obtained when the films were formed at — 190°C were characterized by broad overlapp…
An improved convolutional method is used to synthesize theoretical line profiles generated by the joint action of seven instrumental weight functions characteristic of the x-ray spectrometer. These include in addition to the five geometrical factors described in a previous publication: (VI) a so-called misalignment fu…
The surface and interfacial energies in the system Ni‐A1 2 O 3 md Ni‐ZrO 2 were determined at elevated temperatures by means of equilibrium interfacial angle measurements. Coincidental measurements of surface tension and contact angle for iron and iron‐silicon alloys in Al 2 O 3 give values of interfacial energy. Appl…
A method has been developed for producing carbon films suitable for electron microscope specimen supports. Carbon is evaporated on to an extremely soluble substrate, which is dissolved away leaving very thin films.
Abstract ( 1 ) The electrostatic internal energy of a solution of rodlike, ionized polymolecules is calculated by an integration which makes use of the molecular potentials evaluated previously. ( 2 ) The electrostatic free energy is calculated by a charging process for which the reference state is a discharged soluti…
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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