Materials Literature
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Les charges négatives d'un minéral argileux ne peuvent être neutralisées localement que par des cations monovalents. La saturation du minéral par des cations bi ou polyvalents crée nécessairement des défauts de neutralisation locale. On peut relier à cette circonstance la grande stabilité des états solvatés d'une argi…
Abstract Melting temperatures of cellulose trinitrate (13.96% N) in mixtures with γ‐butyrolactone have been determined dilatometrically, and also by an optical method depending on depolarization of polarized light when transmitted through a semicrystalline sample. Results obtained by these two methods, and also by dir…
High temperature x‐ray diffraction patterns and electrical resistivity measurements show that thorium of 99.8% purity transforms from face‐centered cubic to body‐centered cubic on heating to 1400 ± 25° C. At 1450° C the lattice constant of body‐centered cubic thorium is 4.11 ± 0.01 Å. The extrapolated lattice constant…
S. E. S. El Wakkad, A. M. S. El Din and J. A. El Sayed, J. Chem. Soc., 1954, 3103 DOI: 10.1039/JR9540003103
J. S. Dave and M. J. S. Dewar, J. Chem. Soc., 1954, 4616 DOI: 10.1039/JR9540004616
P. F. Clark, J. A. Elvidge and R. P. Linstead, J. Chem. Soc., 1954, 2490 DOI: 10.1039/JR9540002490
L. L. Bircumshaw, F. M. Tayler and D. H. Whiffen, J. Chem. Soc., 1954, 931 DOI: 10.1039/JR9540000931
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