Materials Literature
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The diffusivity of the oxygen ion in vitreous silica has been directly determined by exchange measurements employing the stable isotope 18 O and mass spectrometer analysis. It was found that over the temperature range 925° to 1225°C the results can be represented by the equation D = 1.51 × 10 −2 exp (‐71,200/ RT ) cm…
E. A. Boudreaux, Trans. Faraday Soc., 1963, 59, 1055 DOI: 10.1039/TF9635901055
Transient radiation effects are defined to be manifestations of electrons excited in materials, i. e., ionization effects. Manifestations of particular interest are the emission of secondary electrons from surfaces, conduction in ionized gases, semiconductors and insulators, and the emission and absorption of optical…
A normalized formulation of the problem of isothermal bubble growth, dominated by viscosity and diffusion, reveals that in its full generality the problem involves eight dimensionless parameters. Limiting cases for extreme values of each of these parameters are investigated.
By emf measurements of galvanic cells, containing FeO/sub 1+x/, it was shown that FeO/sub 1+x/ is not an adiathermal solid solution of two iron oxides. (auth)
A. W. Johnson, I. T. Kay and R. Rodrigo, J. Chem. Soc., 1963, 2336 DOI: 10.1039/JR9630002336
The difference (Δ) effect on Mg metal was measured in , , and of concentrations between 0.05 and 0.50 N at 25 °C. Generally the effect was positive, but the usual linear relationship between Δ and I existed only at low current densities and high acid concentrations. In and , the positive effect changed to negative at…
M. L. Kremer, Trans. Faraday Soc., 1963, 59, 2535 DOI: 10.1039/TF9635902535
Abstract Logarithmic stress relaxation in polycrystalline magnesium of 99.999% purity was studied at strains of up to 4% at 77‐295 °K. The energy barrier of 0.74 ± 0.05 eV, associated with the relaxation, was found to be numerically equal to that known to control the temperature dependence of the flow stress of magnes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleMolecular Structure of Conjunct Polymers.Simon Miron and Robert J. LeeCite this: J. Chem. Eng. Data 1963, 8, 1, 150–160Publication Date (Print):January 1, 1963Publication History Published online1 May 2002Published inissue 1 January 1963https://pubs.acs.org/doi/10.1021/je60016a0…
G. J. Janz, E. Neuenschwander and F. J. Kelly, Trans. Faraday Soc., 1963, 59, 841 DOI: 10.1039/TF9635900841
The lattice parameters of nonstoichiometric uranium oxides, quenched from 1100° C., were determined within the composition range UO 2 to U 4 O 9 . Two separate linear relations for the lattice parameter as a function of oxygen content were obtained: one characteristic of UO 2+x and the other of U 4 O 9-y . The two fun…
In the course of examining new electrode systems for anodic oxidations, the carbon paste electrode was developed. This electrode has proven far more valuable than originally expected and it is the purpose of this paper to critically review its properties, applications, and shortcomings. It is fitting that emphasis be…
Abstract The influence of crystal surface orientation on the graphitization of diamonds heated in vacuum to temperatures about 1700 °C has been studied. It was found that the rate of graphitization is highest in the 〈110〉 directions and lowest in the 〈001〉 directions.
The oxidation of graphite is an interesting reaction due to its technological importance. Volatile reaction products of carbon monoxide and carbon dioxide are formed at all temperatures above 25°C. Below 800°C a small amount of surface oxide is also formed. The rate of oxidation below 800°C is limited by a chemical pr…
The oxidation behavior of tantalum has been studied at 700°–1000°C at oxygen pressures ranging from 1 atm to 0.01 Torr O 2 . The oxidation involves oxide formation and oxygen dissolution in the metal. The rate of oxygen dissolution is governed by diffusion of oxygen in the tantalum metal. Except for the very initial s…
In aqueous solutions of the corrosion of Al can be accelerated by chemical promoters such as S = (or SH − ) ions and/or by a thermal runaway mechanism, and inhibited by surface amalgamation, especially with ‐saturated solutions, and/or by alkyldimethylbenzylammonium salts. Corrosion is also markedly reduced at high an…
Abstract The dissolution process for sintered uranium dioxide into nitric acid falls into two regimes of behaviour which depend on the overall transfer rate. The critical dissolution rate is approximately 8 mg. cm. −2 min −1 , its precise value depending upon the solvent composition. Below this critical value there is…
The thermal conductivities of relatively large homogeneous samples of and have been measured in a dynamic calorimeter from 0°C to 300°C. In both samples, phonon scattering predominates, and the relationship, was observed. For , and for
A theoretica study is made of damage effects by particle radiations in mater, and their dependence on energy, mass,, and charge number of an incoming particle, as well as on the composition of the medium. Typical examples of damage effects are the number of ion pairs formed in a gas, or the number of vacancies created…