Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Lanthanum oxychloride can be activated to show strong fluorescence under excitation by cathode rays. Bismuth as an activator gives a blue emission extending into the ultraviolet with the peak at 3580 Å; antimony a greenish white with the peak at 4960 Å, and samarium a reddish orange emission composed of a series of li…
The oxide layer, giving the so‐called electron diffraction pattern and formed by heating copper in air at 600°C, has been examined by high‐resolution electron diffraction and electron microscopy. It is shown that the intensity anomalies which differentiate the pattern from the normal pattern are not due to impurities…
The rate of reaction of nitrogen with high‐purity zirconium was determined for the temperature range of 975° to 1640°C at 1 atm pressure. The reaction followed a parabolic law and the parabolic rate constant in (ml/cm 2 ) 2 /sec was calculated to be where 48,000 ± 1500 cal/mole is the activation energy for the reactio…
Aiming to obtain an interpretation of the cause for variance in behaviours between fish skin and terrestial animal hide, the relation between hydroxyproline content in the collagen and shrinkage temperatur (Ts) of different animal skins was determined. As a result, it has proved that there was a direct proportion betw…
J. M. Skinner, G. M. D. Stewart and J. C. Speakman, J. Chem. Soc., 1954, 180 DOI: 10.1039/JR9540000180
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…