The heat of sublimation of aluminium trifluoride and the heat of formation of aluminium monofluoride
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Materials Literature
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Reaktionen und Gleichgewichte in Alkalihydroxydschmelzen. III. Peroxydgleichgewichte
Abstract Es wurde das zur Bildung von Alkaliperoxyden führende Gleichgewicht zwischen Alkalihydroxydschmelzen und Sauerstoff in Gegenwart von Wasserdampf bei 410° und 510°C näher untersucht. In trockenem, reinem Sauerstoff wurden bei 410°C maximal folgende Mengen Peroxyd gebildet: magnified image . Während es sich bei…
A Critical Analysis of Pitting Corrosion
A critical analysis of the literature on pitting corrosion published during the past 35 years is presented. The definition of pitting and the factors influencing this type of attack are considered. An examination of the theories of pitting corrosion and the methods used to study this form of corrosion are also include…
Untersuchung der binären Systeme BaOSnO2 und BaOPbO2. II. Kristallstrukturbestimmungen
Abstract Von den drei Verbindungen Bariumorthostannat(IV), Ba 2 SnO 4 , Bariummetaplumbat(IV), BaPbO 3 , und Bariumorthoplumbat(IV), Ba 2 PbO 4 , wurden mit dem Zählrohrgoniometer Pulver‐Diagramme hergestellt. Für das erstmals dargestellte BaPbO 3 wurde in Analogie zum BaSnO 3 das kubische Perowskitgitter gefunden mit…
Homophase and heterophase fluctuations in semiconducting crystals
R. E. Burgess, Discuss. Faraday Soc., 1959, 28, 151 DOI: 10.1039/DF9592800151
338. The stability of iron complexes. Part IV. Ferric complexes with aliphatic acids
D. D. Perrin, J. Chem. Soc., 1959, 1710 DOI: 10.1039/JR9590001710
Relationship between impact strength and spherulite growth in linear polyethylene
Abstract Samples of Ziegler‐type polyethylene containing no additives were placed in a temperature‐programmed oven, melted, and subsequently cooled at constant rates. Average spherulite size, based on the measurement of fifty spherulites, and impact strength by a falling ball method were determined for different cooli…
Transitions from Parabolic to Linear Kinetics in Scaling of Metals
A general rate equation is derived for a model of a barrier scale layer being formed by a diffusion process and simultaneously being depleted at a constant rate by a secondary process. The equation, derived to satisfy rate curves for sulflde scaling of iron in hydrogen sulfide, is shown to be applicable to the oxidati…
Electron Emission at High Fields Due to Positive Ions
Two mechanisms have been proposed to account for the observed large yield of secondary electrons in gaseous breakdown at high electric fields. In one of these a single ion in approaching the cathode surface creates a ``pass'' by decreasing the width of the potential barrier. In the other the increased over-all field d…
701. The mechanism of electrical conduction in fused phosphoric and trideuterophosphoric acids
N. N. Greenwood and A. Thompson, J. Chem. Soc., 1959, 3485 DOI: 10.1039/JR9590003485
The interaction between two cylinder shaped colloidal particles
Abstract The theory of the stability of lyophobic colloids, as given by Derjaguin and by Verwey and Overbeek for the flat‐plate model or the sphere model of colloidal particles, is applied to cylindershaped colloidal particles. Anisometry was taken into account by considering the interaction between two parallel parti…
Oxidation of Titanium, Zirconium, and Hafnium
A metallographic study of the high‐temperature oxidation of titanium, zirconium, and hafnium has shown that alterations in the rate equations relating to such processes may be associated with the establishment of oxygen diffusion gradients in the surface layers of the metal. It has been shown that these diffusion grad…
Graft copolymerization by pre‐irradiation technique
Abstract Trapped free radicals are formed when polyethylene is irradiated with cobalt‐60 gamma rays in the absence of any reactive species‐oxygen, monomer, etc. The net free radical population formed increases with increasing total dose, decreasing temperature of irradiation, and increasing crystallinity of the polyme…
A SPECIFIC HYDROXYLAMINE-FERRIC CHLORIDE REACTION FOR HISTOCHEMICAL LOCALIZATION OF PECTIN
An alkaline solution of hydroxylamine is caused to react with the methyl esters of pectin present in sections of plant tissues to produce hydroxamic acids which, after acidification with hydrochloric acid, yield a red color upon addition of 2.5% ferric chloride solution. The test is specific and preferable to the use…
Préparation des copolymères greffés du polytetrafluoroéthylène (Teflon) par voie radiochimique
Abstract Il a été trouvé antérieurement que l'on pouvait greffer différents polymères sur le polytétrafluoroéthylène, en soumettant à l'action des radiations ionisantes ce polymère en présence de monomères vinyliques. Cependant, comme le Téflon est une substance chimiquement très inerte, aucun monomère ne peut pénétre…
The Flade Potential of Iron Passivated by Various Inorganic Corrosion Inhibitors
The characteristic potential obtained just before decay of passivity (Flade potential) was measured for iron passivated by ferrates, nitrites, chromates, molybdates, tungstates, conc. , and by anodic polarization in . The Flade potential is linear with , of slope 0.059 up to approximately 4.5. Above this value up to 1…
Polymer composition versus low‐temperature characteristics of polysiloxane elastomers
Abstract Gehman cold‐flex, volume‐temperature, and stress‐temperature studies were used to investigate the low‐temperature characteristics of polysiloxane copolymers with respect to copolymer composition. A complete range of phenyl methyl‐dimethyl siloxane copolymers were examined as elastomeric compounds. Like other…
The infra-red spectrum and structure of dicyandiamide
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Rapport sur quelques recherches dans le domaine du magnétisme aux laboratoires Philips
Dans la première partie de l'article, on discute de l'anisotropie cristalline d'un certain nombre de composés d'oxydes hexagonaux contenant du baryum. En l'absence d'un champ magnétique extérieur, le vecteur d'aimantation peut être orienté dans une direction arbitraire par rapport à l'axe c. Ce comportement peut déjà…
Recombination of atoms at surfaces. Part 5.—Oxygen atoms at oxide surfaces
J. C. Greaves and J. W. Linnett, Trans. Faraday Soc., 1959, 55, 1346 DOI: 10.1039/TF9595501346