Materials Literature
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The low‐temperature oxidation of niobium in water vapor and in oxygen occurs by diffusion of oxygen into the metal and formation of and on the surface. forms a porous scale on , growing linearly from the oxide‐oxide interface. Solution of oxygen in the metal and the growth of on niobium are believed to be diffusion co…
A brief account is given concerning the theoretical framework of the molecular orbital treatment of crystal field theory. Indirect and direct experimental evidences of electron delocalization are summarized. A historical survey is given of the theoretical treatment of cubic crystal field splitting. Finally, a molecula…
Abstract An Hand von röntgenographischen Untersuchungen, insbesondere mit der UNICAM‐Hochtemperaturkamera sowie mit Hilfe differentialthermoanalytischer Untersuchungen und Kapazitätsmessungen konnte nachgewiesen werden, daß die thermische Zersetzung aller Ammoniumparawolframate zum WO 3 zunächst über einen röntgenamor…
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In a previous paper, studies of the various physical properties of molten lead silicates were reported. Observation of the effects of the structure sensitive properties of lead silicate melts resulting from addition of various metallic oxides as a third element should be of great importance in order to understand the…
N. T. Notley, Trans. Faraday Soc., 1962, 58, 66 DOI: 10.1039/TF9625800066
Experimental methods are described for studying rates of formation of soluble and insoluble corrosion products of copper exposed to water containing dissolved oxygen and carbon dioxide. Coulometric reduction indicates that the films formed on copper under these conditions are predominantly of cuprous oxide. Generation…
The oxidative dissolution of copper in acidic, aqueous media is limited in rate by the presence at the metal‐solution interface of a growing film of cuprous oxide. A brief survey of what is known about the nature and modes of growth of such films provides the basis for a "duplex film" model of the corroding copper sys…
The weight gain of Zircaloy‐2, ‐3, and low nickel Zircaloy‐2 during water and steam corrosion is shown to go through two or more repetitive cycles. The evidence indicates these weight gain curves truly represnt the corrosion kinetics. Several corrosion mechanisms are considered in the light of these kinetics. While no…
A particular interest in the properties of transition metal alloys at the present time is the problem of the occurrence of localised electron spins. There is also, particularly in the first period, the problem of ordered magnetic states. Recent work has established that suppression of localised spin may occur in mater…
The compounds Pd4Se and PdaS are isostruetural, space group P421c(D~d ), with eight palladimn atoms in general positions and two selenium (sulfur) atoms in positions 0, 0, 0; , , . For Pd4Se the palladium coordinates were determined to be x =0.374, y =0.232, z =0.154, and for Pd4S to be x =0.358, y =0.230, z =0.155. I…
Abstract A detailed study of the thermal expansion of silicon is made using an X‐ray powder technique, between room temperature and 900 °C. The values only agree with those of MAISSEL below 700 °C, the present values being higher above this temperature. It is found that Grüneisen's two‐constant formula cannot fit the…
Abstract Heats of polymerization of twelve vinyl monomers have been determined on an isothermal distillation calorimeter working at 74.5°C. Polar monomers were found to have their molar heats of polymerization appreciably dependent on the extent of association of the monomeric state in the medium of polymerization and…
The removal of residual volatile components from polymers is an operation of some importance in the plastics industry. A generalized, although somewhat idealized, model for continuous, wiped-film devolatilization of viscous polymer melts is presented which relates devolatilization capability to important geometry, ope…
The Curie points of K2ReCl6 and K2ReBr6 obtained from magnetic susceptibility measurements are 12.4±0.5° and 15.3±0.5°K, respectively, which confirm that cooperative-type transitions observed in the heat capacities of these compounds with maxima at 11.9±0.1° and 15.2±0.1°K, respectively, represent transitions to the a…
Thermodynamic data for reactions concerned in the corrosion of copper in waters containing dissolved oxygen and carbon dioxide are assembled and are used to demonstrate certain features of the corrosion processes. These include the extreme vulnerability of copper to attack, the critical effects of oxygen, and the inad…
R. M. Barrer and D. J. Ruzicka, Trans. Faraday Soc., 1962, 58, 2262 DOI: 10.1039/TF9625802262
Abstract In this paper a method is described for the numerical evaluation of phonon widths and shifts due to three‐phonon processes in an anharmonic crystal. With this method the δ‐function and principal value restrictions on the frequencies of the phonons participating in the three‐phonon processes do not have to be…
Abstract Sorgfältig gereinigte Lactone polymerisieren mit anionischen Initiatoren (metallisches Natrium, Naphthalin‐Natrium, Aluminiumalkyle) schon bei Zimmertemperatur zu hochmolekularen Polyestern (M̄ bis 100 000 und höher). Besonders wirksam sind Aluminiumalkyl/Wasser‐Systeme. Bei der Polymerisation des β‐Propiolac…
Abstract By polymerizing phenyl or n ‐butyl isocyanate in various solvents in the presence of anionic catalysts such as lithium or sodium alkyls, crystalline polymers were obtained. For both polymers, the I.R. spectra, the X‐ray diffraction spectra and other physical properties are reported. The possible structures of…