Materials Literature
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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 influence of an addition of chromium on the thermal expansion coefficient of the alloys of iron, cobalt and nickel has been determined. It has been found that in the quaternary system of iron, cobalt, nickel and chromium, there are two valleys of the expansion coefficient, one of which originates in the compositio…
The combination of high electrical resistivity and useful magnetic properties has caused ferrites to become increasingly important as high-frequency core materials. A description of the general structural and saturation magnetization properties of the more simple ferrites, and of their preparation, is followed by a br…
Abstract In some circumstances tin surfaces remain unattacked by solutions of ammonia. Factors leading to a low probability of the beginning of corrosion are: reduction in temperature of the solution, the quality of the metal surface, especially as it affects the formation of a protective oxide film in air, and also e…
(1955). Investigations Concerning Formation, Preservation and Utilization of Carotene. Acta Agriculturae Scandinavica: Vol. 5, No. 1, pp. 113-184.
M. E. Baguley, H. France, R. P. Linstead and M. Whalley, J. Chem. Soc., 1955, 3521 DOI: 10.1039/JR9550003521
A DURABILITY TEST FOR ASPHALT USING THE SLIDING PLATE (MICROFILM) VISCOMETER IS DESCRIBED AS FOLLOWS: A 5 MICRON FILM OF ASPHALT IS AGED ON GLASS PLATES FOR 2 HOURS AT 225 F. THE HARDENING WHICH OCCURS IS DETERMINED BY MEASURING THE VISCOSITY OF THE ASPHALT BEFORE AND AFTER AGING. THE DURABILITY IS REPORTED AS AN AGIN…
Abstract Das Verhältnis der Bindungsenergie (–E e ) zum Schmelzpunkt (T m ) scheint für die Alkalimetalle annähernd konstant zu sein. Dies gibt einen weiteren Hinweis dafür, daß möglicherweise T m auch anorganischen festen Stoffen korrespondierende Temperaturen darstellt. Theoretisch läßt sich zeigen, daß nach der M O…
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An experiment has been performed which leads to the conclusion that the initial permeability and radio-frequency dispersion in sintered nickel ferrite are due principally to rotation of crystallite magnetic moments in an equivalent anisotropy field. Samples have been prepared by the partial sintering of nickel ferrite…
Aluminum alloys are the anodic members of titanium‐aluminum alloy couples in dilute sulfuric acid solutions in the presence of air. In stronger acid solutions, particularly when air is absent, aluminum alloys are anodic only at the beginning of the immersion period. After an induction period titanium becomes anodic. A…
A method for electrodeposition of protective titanium coatings on steel and other base metals is described. The procedure involves electrolysis of potassium titanium fluoride dissolved in alkali or alkaline earth halides under an inert atmosphere. Graphite or titanium metal anodes are employed. Adherent titanium coati…
When the activator ions in a phosphor have a charge different from that of any ions in the host lattice, it is generally agreed that charge compensation must take place. A new theory of luminescent centres is proposed in which the compensation of charge, by lattice vacancies or by activator ions, is localized in the v…
The film responsible for passivity when iron is immersed in concentrated nitric acid is shown to be ferric acid or a related higher valence iron compound. This was proved ( a ) by demonstrating formation of chromates when a 2.84% Cr‐Fe alloy is passivated, ( b ) by showing complete suppression of the iron‐nitric acid…
Preparation of commercially pure titanium metal powder by electrolysis of in molten is described. The process is carried out under an inert atmosphere in an all‐graphite cell. Operating conditions of the electrolysis and their effect upon the metal so produced are discussed. Preparation of the and the electrolytic pro…
Research on the dielectric strength of high-voltage cables can be very conveniently carried out on "models". Either plate or cylindrical capacitors can be used for this purpose. This paper reports the results of many tests both at power frequency and at impulse, which have the purpose of investigating the separate and…
A study has been made of the mechanism of the reaction taking place when zinc is anodically treated in potassium hydroxide solutions. The zinc‐containing ion present in solution as a result of the anodic treatment is . However, zinc oxide or hydroxide is an intermediate leading to the formation of . This latter ion th…
The reaction of nickel with molten sulfur between 205° and 445°C follows the parabolic law. Up to 260°C the millerite form of was the only sulfide detectable in the scale. At 340°C and higher, the high temperature B8 form of was the only sulfide in the scale. The activation energy (Arrhenius) below approximately 300°C…
D. H. R. Barton and E. Miller, J. Chem. Soc., 1955, 1028 DOI: 10.1039/JR9550001028
J. C. McCoubrey, Trans. Faraday Soc., 1955, 51, 743 DOI: 10.1039/TF9555100743