Conjugated macrocycles. Part XXVI. Octamethyltetrazaporphin
M. E. Baguley, H. France, R. P. Linstead and M. Whalley, J. Chem. Soc., 1955, 3521 DOI: 10.1039/JR9550003521
Materials Literature
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MICROFILM DURABILITY TEST FOR ASPHALT
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…
Relation between lattice energy and melting points of some crystalline substances. II. Alkali Metals
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…
Energie des parois de Bloch dans les couches minces
International audience
Domain Rotation in Nickel Ferrite
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…
Galvanic Corrosion Behavior of Titanium and Zirconium in Sulfuric Acid Solutions
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…
Electrodeposition of Titanium on Base Metals
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…
Atomic configurations in luminescent centres
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…
Nature of the Passive Film on Iron in Concentrated Nitric Acid
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 Titanium by Fluoride Electrolysis
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 Electric Breakdown of Fully Impregnated Paper Insulation for High-Voltage Cables [includes discussion]
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…
Electrolytic Oxidation of Zinc in Alkaline Solutions
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…
Kinetics of Nickel-Sulfur and Steel-Sulfur Reactions
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…
The constitution and stereochemistry of terrein
D. H. R. Barton and E. Miller, J. Chem. Soc., 1955, 1028 DOI: 10.1039/JR9550001028
The acid strength of the hydrogen halides
J. C. McCoubrey, Trans. Faraday Soc., 1955, 51, 743 DOI: 10.1039/TF9555100743
Young's modulus of crystalline, unstretched rubber
M. Leitner, Trans. Faraday Soc., 1955, 51, 1015 DOI: 10.1039/TF9555101015
The mesomorphism of diisobutylsilanediol
C. Eaborn and N. H. Hartshorne, J. Chem. Soc., 1955, 549 DOI: 10.1039/JR9550000549
Soil pH and Base Status as Factors in the Distribution of Calcicoles
It is a well-known fact that many species of wild plants are characteristic of limestone and other base-rich neutral soils and are loosely termed calcicoles, and there is a corresponding group characteristic of acid soils poor in bases termed calcifuges. In this paper is reported an attempt to discriminate between som…
Electrostriction
The term ferroelectricity is briefly introduced and the properties of the perovskite-structure mixed-oxide group are reviewed with special reference to BaTiO 3 . The distinction between piezoelectricity and electrostriction is explained in some detail, and the relevant expressions relating the electrical and mechanica…
Viskosimetrische molekulargewichtsbestimmung von cellulose in kupfer‐äethylendiamin
Abstract Cellulose löst sich in Kupferäthylendiamin („Cuën”︁) schneller und ist gegen Luftsauerstoff beträchtlich unempfindlicher als in Cuoxam. Im Gegensatz zu amerikanischen und französischen Arbeiten wurde festgestellt, daß Lösefähigkeit und Viskositätszahl weitgehend unabhängig von der Zusammensetzung des Komplexe…