Materials Literature
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The spiralling of the current in steel-cored aluminium conductors sets up an axial magnetic flux, and at power frequency this results in power loss from hysteresis in the steel core and from eddy currents. This loss increases with current and raises the a.c. resistance of the conductor; the internal inductance also in…
D. G. Edwards, A. M. Posner and J. P. Quirk, Trans. Faraday Soc., 1965, 61, 2816 DOI: 10.1039/TF9656102816
S. Mallikarjun and N. E. Hill, Trans. Faraday Soc., 1965, 61, 1389 DOI: 10.1039/TF9656101389
Abstract Experimental results obtained over a wide range of variables from three different foam fractionation columns support the theory developed in Part I.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation and Characterization of Compounds Containing both Hexabromorhenate(IV) and the Trirhenium Non abromide GroupF. A. Cotton and S. J. LippardCite this: Inorg. Chem. 1965, 4, 1, 59–65Publication Date (Print):January 1, 1965Publication History Published online1 Ma…
Abstract The decomposition of iron pentacarbonyl at pressures between one and 400 Torr was studied from 120° to 300°C. Up to about 200°C. the rate was primarily limited by surface kinetics of adsorbed carbonyl. Gas phase diffusional resistances were controlling at higher temperatures. In the kinetically controlled reg…
Abstract The distribution of cations in MgMn 2 O 4 is studied between 25 and 1000 °C by X‐ray diffraction. The values of the c/a ratio agree with the observed repartition of the cations. From the inversion of the distribution at high temperature the activation energy of the ionic migration is inferred: θ = 8100‐−18400…
The formation of several intermediate oxides of niobium, produced in the course of transformation γ-Nb 2 O 5 → α-Nb 2 O 5 and the reaction Nb 2 O 5 +Nb→ NbO 2 , has been studied by X-ray diffraction. The structure transformation γ→α is accomplished by a passage through two intermediate stages, γ' and β. The γ' form is…
The relationship between dissolution kinetics and resistance to pitting corrosion has been investigated using electrochemical measurements. It is shown that the ratio of dissolution rates in the presence and absence of chloride ion is inversely related to pitting resistance. The above concepts have been used to predic…
Solid solution between and of stoichiometric composition has been studied. It is found that for samples annealed at 600°C for periods of up to four weeks and then air quenched, single phase condition can be obtained at all alloy compositions, and the lattice shows a continuous transition from cubic to rhombohedral for…
The first- and second-order Raman spectra of calcium fluoride have been measured. With the crystal at room temperature the structure observed is in good agreement with earlier measurements of infra-red absorption and vibronic satellites. Some additional structure observed in the second-order Raman spectrum is ascribed…
Experiments have been carried out at 386°C to determine the concentration of anion vacancies at the metal‐oxide interface and the diffusion coefficients for anion vacancies in zirconium dioxide films on zirconium by the "interruption kinetic technique." The conditions for which this technique is valid are discussed. T…
R. J. Bratton and G. W. Brindley, Trans. Faraday Soc., 1965, 61, 1017 DOI: 10.1039/TF9656101017
M. Fleischmann, J. A. Harrison and H. R. Thirsk, Trans. Faraday Soc., 1965, 61, 2742 DOI: 10.1039/TF9656102742
The single crystal model previously proposed for the primary crystallization of polymethylene (Gordon and Hillier 1964) is extended to the secondary or post-Avrami process. An equation by Eyring, which generalizes Maxwell's treatment for the relaxation of matter, is shown to fit this process, which can be kinetically…
The earlier diagram of β phase region is revised on the basis of x-ray and magnetic studies, and the existence of three phases β, η, κ is confirmed. The new β phase is homogeneous in a range from 32.8 to 40.0 at% Ge at 1050°C, η phase from 40.8 to 43.5 at% Ge at 800°C and κ phase has a narrow range of homogeneity at 4…
E. Hirst and D. A. Rees, J. Chem. Soc., 1965, 1182 DOI: 10.1039/JR9650001182
The coefficient of self-diffusion in annealed and prestrained nickel single crystals, Du, determined in the temperature range 948° to 1023°K by radioactive counting of the surface is Du=1.9 exp(−66 800/RT) cm2sec−1. The coefficient of self-diffusion in annealed and prestrained fine-grained nickel crystals, Du′, in the…
The effect of low concentrations of plasticizer, chain ends, or comonomer on the glass transition temperature of a polymer can be described by a linear equation with respect to the weight fraction. Over the entire range of composition, these effects can be described approximately by a quadratic equation. The interrela…
If resistance to crack growth always increased with crack velocity, then its measure at nil velocity, Gc or GIc, would always represent minimum toughness and thus a safe criterion. The practical difficulty arises if an increased crack speed, or loading rate of a fixed crack, results first in a decrease in R, possibly…