Materials Literature
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ANODIC OXIDE FILMS ON TANTALUM ELECTRODES PART 1. THICKNESS AND CURRENT EFFICIENCY OF FORMATION ANODIC OXIDE FILMS ON TANTALUM ELECTRODES PART 1. THICKNESS AND CURRENT EFFICIENCY OF FORMATION BY L. YOUNG Metallurgy Division, A.E.R.E., and Dept. of Chemistry, Imperial College Received 7th September,
J. E. O. Mayne and J. W. Menter, J. Chem. Soc., 1954, 103 DOI: 10.1039/JR9540000103
It is shown that the general expression for the magnetic resonance frequency of the two-sublattice model of a ferrimagnetic crystal has essentially the same form as that originally obtained for the ferromagnetic case provided that the product of the molecular field coefficient and the net magnetization is large compar…
The familiar Heisenberg theory of ferromagnetism in the 3d transition metals iron, cobalt and nickel, rests on the assumption of a positive exchange integral between neighbouring ions, since ferromagnetism is not possible in cases where this integral is negative (` antiferromagnetic '). The idea that the remaining non…
The essential features of two instruments for recording the load–extension curves of yarns at constant rates of extension from 0·001 to 1000 per cent per second are described. They were used to investigate the effect of the rate of extension on the tensile behaviour of viscose rayon (continuous filament, and staple fi…
The phase diagram of zirconium‐hydrogen alloys was studied on alloys prepared at low temperature and for alloys in the composition range of to . Decomposition pressure studies were made over the composition range and for a series of temperatures. Results of these measurements were in complete agreement with crystal st…
A modified Ångström method for measuring thermal diffusivity and hence thermal conductivity of metals has been developed. Like previously reported dynamic methods, this method uses a heat source, whose temperature varies sinusoidally with time, located at one end of an effectively infinite rod. Unlike these methods, o…
Abstract 1. A manganous manganite with a very low degree of disorder is described with the composition: 4 MnO 2 , Mn(OH) 2 , 2H 2 O. It is formed by recrystallisation of dry 3 MnO 2 , Mn(OH) 2 , xH 2 O, or in direct preparation by oxydation of Mn(OH) 2 with oxygen in alkaline solution. The X‐ray diffraction pattern ob…
S. F. Mason, J. Chem. Soc., 1954, 2071 DOI: 10.1039/JR9540002071
Abstract A theory of the excluded volume of branched molecules has been developed. The model of the branched molecule is a main or backbone string of beads from which side branches (which are themselves unbranched) originate. Each of these beads has the property of the Kuhn statistical chain element. The calculation i…
The phyla of freshwater algae herein recognized are as follows:
W. I. H. Winning, J. Chem. Soc., 1954, 926 DOI: 10.1039/JR9540000926
A. Hickling and J. K. Linacre, J. Chem. Soc., 1954, 711 DOI: 10.1039/JR9540000711
Certain complex, sulfur‐containing sodalite‐type silicates, synthesis of which is described, exhibit under 3650 Å excitation an emission extending from 5000 Å to beyond 7000 Å, the spectrum varying with composition. The band structure of this emission at −196°C is similar to the emission structure shown by a mixture o…
This paper∗ deals with a new type of green alga originally found on the Cape Flats and since obtained in the United States of America and Australia. Initially identified as a second species of Volvulina Playfair, the considerations which led to the establishment of a distinct genus, Astrephomene, including the appeara…
The rate of oxidation of high purity zirconium was determined for the temperature range of 575° to 950°C at 1 atm pressure. Data can be fitted to a cubic law and the rate constant in (ml/cm 2 ) 3 /sec has been calculated to be , where 47,200 ± 1,000 cal/mole is the activation energy for the reaction.
The initial resistance to twisting, or torsional rigidity, of single fibres from thirty-four samples has been measured by the torsion pendulum method, with period of oscillation from 4 to 9 seconds and twist less than half a turn per cm. Using preliminary experiments on the influence of tension, damping and period of…
Abstract High molecular weight polymethacrylic acid in aqueous solution is rapidly broken down by ultrasonics (250 kc.). The rate of degradation varies as the shape of the molecule in solution is altered and is greatest when most asymmetric. It is concluded that cavitation is essential for the breakdown of the polymer…
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SHORT COMMUNICATIONSshows a peak electron density of 44.0 e.Zk -s, of which 9.6 e.A -s is due to the extrapolated portion of the f-curve, and a central curvature of 2350 e..~ -5, half of which arises from the extrapolation.Work is proceeding on the low-temperature refinement of the other two zones in the hope of obtai…