Materials Literature
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The Born model of the ionic crystal is used to calculate the energies of formation of point defects in CaF2 and UO2 in the zeroth, first and second orders. The results of calculation, to all orders, indicate that anion-Frenkel pairs are the intrinsic defects in CaF2 and are in agreement with previous calculations. In…
The changes in the electrical resistivity of nickel-rich Ni-Nb alloys due to the formation of short-range order exhibit an anomalous dependence on the solute concentration. This anomaly can be explained by the formation of embryos of long-range order of the type Ni8Nb in alloys approaching the NisNb composition and ne…
Abstract Der Einfluß der Elektronenreemission auf die Anlaufkennlinie wird berechnet und mit Messungen an den Primärelektronen in einer Niederdruckentladung verglichen. Die Messungen zeigen die von der Rechnung vorhergesagten Strukturen, die auf der Energieabhängigkeit des Reemissionskoeffizienten beruhen. Aus der Mat…
The kinetically controlled alkylation of palladium corrole ambident anions occurs both at the nitrogen atom (N-21) of ring A and at a peripheral carbon atom (C-3). Variation in solvent, from dipolar aprotic to strongly hydrogenbonding, allowed some control of the C:N alkylation product ratio. The palladium 2,3,7,8,12,…
Several mono and bistrithiocarbonates were synthesized by the reaction of the correspondingmono and bisepoxides with carbon disulfide in the presence of potassiumhydroxide. These trithiocarbonates were successfully obtained even in the presenceof a catalytic amount of potassium hydroxide. Potassium methoxide instead o…
Les spectres de diffusion Raman de monocristaux orientés sont étudiés dans les deux phases. Outre le mode ferroélectrique étudié en premier par Kaminov et Damen [1], on observe dans la phase ferroélectrique une raie fine de diffusion à 515 cm-1 liée au déplacement de l'atome de phosphore. L'étude est complétée par cel…
The effects of xenon-arc radiation, using an Atlas Weather-Ometer and a clear glass pyrex filter system, on the breaking strength, extension-to-break, and the energy-to-break for several nylon, polyester, and polyester/cotton yarns were compared to these of outdoor exposure behind window glass. Both types of exposure…
Strontium sulfate in equilibrium with aqueous solution leaches selectively from barium-strontium sulfate solid solutions at 25 degrees centigrade and at 1 atmosphere. Equilibrium concentrations of Sr ++ and Ba ++ in aqueous solution are not significantly different from values calulated on the assumption that the chemi…
Cleavage and growth faces of ammonium perchlorate have been examined by high-power interference–contrast microscopy. From the observed directions of etch-pit arrays on three crystallographically distinct faces of the orthorhombic form of ammonium perchlorate, and also from the nature of the slip bands on deliberately…
Nous avons commencé dans les précédents numéros des Annales de Physique (Tome 6, n° 4 et 5, pages 189 à 326), la publication d’une monographie consacrée à l’étude des propriétés physiques d’un système atomique en interaction avec un champ de radiofréquence.
An analysis is presented of the forced oscillations of a gas-filled bubble at rest in a large body of a linear viscoelastic fluid. Two types of forcing are considered. In the first, oscillations are induced by a pressure surge on the system. For the three-parameter fluid model employed, numerical computations show tha…
Abstract ESR measurements of Cr 3+ ions in SrTiO 3 at orthorhombic lattice sites in the cubic phase of the crystal are described. The orthorhombic distortion is caused by an oxygen vacancy in the neighbourhood of the Cr 3+ ion. A model of the displacement of the neighbouring oxygen ions is proposed. The values of the…
Abstract A field study was conducted to determine extractable phosphorus variability on highly fertilized calcareous soils when three different ratios (1:10, 1:50, and 1:100) of soil to Bray no. 1 extracting solution were used. Calcium carbonate equivalence (CCE) was determined on all samples and calcite/dolomite frac…
Comments are made on a recent paper by Hofman and Breitling on the rate of electromigration in thin films. It is shown that the simple concept of electron momentum transfer leads to a quadratic relation between the current density and rate of electromigration, in agreement with Black. Comments on the difficulty of rel…
Work at the former National Chemical Laboratory and the National Physical Laboratory is reviewed in the light of corrosion problems that occur in central heating systems. Important factors discussed include variation- in composition and aggressivity of the waters used; the morphology of pitting attack; and the influen…
Abstract X‐ray crystal structure investigations of the isomorphous perchlorate salts of complexes of an A/D‐seco‐corrinoid ligand (I) with divalent nickel, palladium and platinum are reported. The structures determined for the Pd‐ and Pt‐complexes are virtually superposable, that of the Ni‐complex, although similar to…
A void model for hydrogen diffusion in steel is set up using the simplest assumptions. The model is then extended to allow for the non-ideal behaviour of hydrogen up to pressures in the region of 1000 atm (l01.33 N/mm2). The main aim has been-to account for the distinct change in overall activation energy for diffusio…
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Abstract A description of transient behavior of a spherical liquid drop rising or falling in a quiescent continuous field has been obtained by numerical methods. It is found that for the same disperse phase to continuous phase density ratio, the transient behavior of a liquid drop is usually intermediate between that…
From the viewpoint of protection against overvoltages, it is often desirable to know the attenuation of travelling waves in high-voltage cables. In the paper, the attenuation due to the combined effect of dielectric losses in the cable insulation and the skin effect in the core and sheath is calculated. The results ar…