704. The anodic oxidation of metals at very low current density. Part II. Nickel
S. E. S. El Wakkad and S. H. Emara, J. Chem. Soc., 1953, 3504 DOI: 10.1039/JR9530003504
Materials Literature
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SUANITE, A NEW MAGNESIUM BORATE MINERAL FROM HOL KOL, SUAN, NORTH KOREA
A new mineral from the Hol Kol mine, North Korea of the composition Mg2B2O5, named suanite, has been described. The mineral is found usually as fibrous aggregates associated with kotoite and other borate minerals in marble which borders the gold-and copper-bearing diopside-clinohumite skarn mass. The crystal usually e…
Preparation and Properties of Iodide Vanadium
Massive vanadium was prepared by the hot‐wire reduction of vanadium iodide vapor by both the Van Arkel‐de Boer method and a straight‐flow process. The iodide decomposition provides an excellent method of obtaining small quantities of vanadium exceptionally low in nonmetallic impurities. Metal prepared by the straight‐…
Elektronenoptische Abbildung auf Grund der Wellenmechanik. I
Abstract Ausgehend von der Schrödinger‐Gleichung des rotationssymmetrischen elektrisch‐magnetischen Feldes wird die Existenz einer objektähnlichen Abbildung bewiesen. Die Wellenfunktion des paraxialen Bereiches wird dazu für jede beliebige Einstellebene durch den Verlauf der Wellenfunktion in der Objektebene ausgedrüc…
Raman effect in solids
A summary is given of the early work in this field, followed by an outline of the theoretical treatment of vibrations in crystals. The alkali halides have received a somewhat more detailed treatment than other substances. A bibliography is appended, giving references to many papers, covering more especially the last f…
440. Aromatic azo-compounds. Part I. Oxidation of cis- and trans-azobenzene
G. M. Badger, R. G. Buttery and G. E. Lewis, J. Chem. Soc., 1953, 2143 DOI: 10.1039/JR9530002143
Spontaneous Magnetization — Techniques and Measurements
Measurements on the temperature variation of spontaneous magnetization by both the magnetothermal and magnetic methods have hitherto been confined to nickel; the extension of these measurements, calling for greater sensitivity, is discussed. To the direct method devised by Weiss and Forrer has been added a direct curr…
Electroluminescent Zinc Sulfide Phosphors
The preparation of blue, green, and yellow electroluminescent zinc sulfide phosphors is described. The blue and green phosphors contain copper and lead, with the color being determined by the copper and chloride concentration. The yellow phosphors are triple‐activated, containing copper, lead, and manganese.
Dielectric Dispersion in the Microwave Region of Six Tetrasubstituted Methanes in the Solid State
A method is described for the measurement of dielectric constant and loss at microwave frequencies and low temperatures. The dielectric constant and loss at 3.22 cm wavelength (9.32×109 cycles/sec) have been measured over a range of temperature in the solid state and in the liquid near the melting point for t-butyl ch…
Studies on the Concept of Large Activator Centers in Crystal Phosphors
The explanation of the variation of efficiency with concentration of activator in terms of a large center, given by Ewles, was oversimplified. The recent suggestion of Johnson and Williams that an activator can only function as a luminescent center if no other activator occupies any of lattice sites surrounding it, le…
The kinetics of autoxidation of ferrous ions in concentrated HCl solutions
A. M. Posner, Trans. Faraday Soc., 1953, 49, 382 DOI: 10.1039/TF9534900382
The Hall Effect of Copper-Nickel Alloys
The ordinary and extraordinary Hall effects have been measured at room temperatures for the N-Cu series of alloys. The number of conduction electrons calculated from ${n}^{*}=\frac{1}{{R}_{0}\mathrm{Nec}}$ (where ${R}_{0}$ is the "ordinary" constant measured at high fields) agrees fairly well with the number of $4s$ e…
60. The isomeric dithiacyclopentenethiones
F. Challenger, E. A. Mason, E. C. Holdsworth and R. Emmott, J. Chem. Soc., 1953, 292 DOI: 10.1039/JR9530000292
Saturation and Magnetization of Hexagonal Iron Oxide Compounds
The value of the saturation magnetization at absolute zero of BaO\ifmmode\cdot\else\textperiodcentered\fi{}6${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$ and related compounds can be explained as due to noncompensated antiferromagnetism.The Bloch wall formation in small particles is discussed. One is led to the assumption tha…
The Spin-Wave Theory as a Variational Method and Its Application to Antiferromagnetism
The spin-wave theory in a modified form is applied to antiferromagnetism. The interaction between different modes of spin-waves, which is due to the higher order terms omitted in the customary spin-wave treatment, is taken into account in a self-consistent manner. It is shown that the interaction terms cause a change…
Crystal Structures of Gutta Percha
Thin films of gutta percha have been examined by means of electron diffraction, and shown to exist in three distinct crystalline forms, termed the α, β and γ modifications, whereas prior to this work only two forms had been recognized. The conditions necessary for the occurrrence of the different forms are considered…
Domain Pattern in Silicon-Iron under Stress
This paper discusses investigations into the detailed changes in domain structure of ferromagnetic material under externally applied stress. The changes in the domain pattern of grain-oriented silicon steel with large grain size were observed and photographed while the specimen was stressed in tension.Experiments in w…
The decomposition of nitrous oxide on cuprous oxide and other oxide catalysts
R. M. Dell, F. S. Stone and P. F. Tiley, Trans. Faraday Soc., 1953, 49, 201 DOI: 10.1039/TF9534900201
The importance of extracellular products of algae in freshwater
(1953). The importance of extracellular products of algae in freshwater. SIL Proceedings, 1922-2010: Vol. 12, No. 1, pp. 219-232.
Thin Films of Ferromagnetic Materials
Experimental observations are reported on the magnetic properties of thin evaporated films of nickel. The saturation magnetization follows the general prediction of Klein and Smith after somewhat arbitrary modifications on the basis of fitting the Weiss curve for bulk specimens, as suggested by Drigo. Qualitatively ob…