Materials Literature
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Red-degraded bands observed in absorption in the region 3600–3900 Å when strontium sulphide is heated in a carbon tube furnace to about 2000°C are assigned to a 1Σ+–1Σ+ system of SrS. The lower state is probably the ground state : the upper state is strongly perturbed. Constants derived from the analysis of five bands…
Abstract The role of clay minerals in influencing the polymerization of organic monomers can be ascribed to a charge transfer between the clay and the adsorbed species. Polymerization may be either initiated or inhibited by the clays.
Abstract not Available.
Oxidation and reduction processes of silver‐silver oxide electrodes were studied, especially the influence of light excitation on these processes. The experimental results have shown that light absorption by silver (I) oxide leads to an anodic oxidation to silver (II) oxide. The electrochemical reduction of silver (II…
The single-crystal polarized spectrum of [(Ph2MeAsO)4CoNO3]+NO3– has been recorded at 300, 77, and 20 K and principal magnetic susceptibilities of single crystals measured in the range 300–90 K. These properties have been interpreted within a point-charge crystal-field model and the results compared with those for the…
The polarised single-crystal electronic and e.s.r. spectra of 2,2′-bipyridylbis(hexafluoroacetylacetonato)copper(II) have been measured. The correlation of the single-crystal electronic and e.s.r. spectral data with the crystallographic data indicates a dxy ground state. The polarised single-crystal electronic spectra…
The antibacterial activity of methanol extract from the root bark of Akanda (Calotropis gigantea L.) and its petroleum ether, chloroform and ethyl acetate fractions were investigated. Both of methanol extract and its chloroform fraction showed activity against Sarcina lutea, Bacillus megaterium and Pseudomonas aerugin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeat of formation of gallium(I) tetrachlorogallate(III) and the chloride-gallium trichloride bond energyJ. D. Beck, Robert Hemsley Wood, and N. N. GreenwoodCite this: Inorg. Chem. 1970, 9, 1, 86–90Publication Date (Print):January 1, 1970Publication History Published online1…
This paper provides computed radial stresses and penetration depth for a concrete target that is impacted by an ogive-nose steel projectile at a velocity of 315 m/s. The computed results are in good agreement with recently published experimental results. Also included is a description of the concrete model.
Abstract A unified theory of field‐, thermo‐, and photoemission from metal surface is considered, and the general quantum‐mechanical methods for the investigation of the threshold phenomena are applied. As result the corresponding final expressions are obtained in such a form that it is possible to apply immediately t…
The single-crystal polarized spectrum of [(Ph2MeAsO)4NiNO3]+NO3– has been recorded at 300 and 77 K. Principal magnetic susceptibilities of single crystals have been obtained in the temperature range 300–90 K. These properties have been interpreted within a crystal-field framework. Care has been taken not to report a u…
The atomic parameters of a natural tilleyite [a = 15.108(3), b = 10.241(1), c = 7.579( 1) A, fJ = 105.17 (1) 0] were refined by least squares using threedimensional data. The distortions of the columns of calcium-oxygen octahedra are mostly explainable by shortening of shared edges. In the Si207 group the Si-O bridge…
Abstract Electron microscope studies have shown that calcium montmorillonite, originally dispersed into separate platelets, flocculates with time to form large flat sheet‐like particles which exhibit pronounced flow birefringence. Although kinetic studies indicate for rapid salt flocculation face to face condensation…
Abstract Experimental results have been obtained for heat transfer to melting ice spheres by measuring the rate of change of apparent weight. It is found that the traditional correlation format of Nusselt number against Rayleigh number is satisfactory only for bulk temperatures above 7°C. Average Nusselt numbers obtai…
Les propriétés métamagnétiques d'un monocristal de ErCrO3 sont étudiées par mesures d'aimantation et de diffraction neutronique sous champ. Les résultats mettent en évidence la forte anisotropie de l'erbium et l'existence d'un couplage chrome-erbium non négligeable. Une mesure de chaleur spécifique à basse température…
In order to establish methods for the growth of large, high-quality crystals of ferroelectric bismuth titanate, Bi4Ti3O12, the Czochralski, flux evaporation, fluxed horizontal gradient freeze, and vertical gradient flux techniques were investigated. Best results were obtained with the vertical gradient flux technique.…
The crystal structure of [{N(CH2CH2N = CHC5H4N)3}Fe](BF4)2 contains FeII with slightly distorted octahedral co-ordination, and mean Fe–N distance 1·96 Å: the tertiary amine nitrogen atom is at a distance of 3·44 Å from the iron atom.
Tetra-alkylammonium salts of [MX4]– anions (M = As; X = Cl or Br; M = Sb or Bi; X = Cl, Br, or I) have been prepared and their low-frequency (<400 cm.–1) i.r. and Raman spectra studied in the solid state (i.r. and Raman) and in solution (Raman). Excepting for solid [Et4N][AsCl4] and [Bun4N][SbI4], the results point to…
Abstract Spezifisch 14 C‐markierte Sorbosen und Sorbose‐6‐t werden synthetisiert und mittels konz. Salzsäure in braune Polymere übergeführt, die thermisch fragmentiert werden; flüchtige Pyrolyse‐Produkte werden kapillargaschromatographisch getrennt und identifiziert. Aus der Verteilung der 14 C‐Atome in den Bruchstück…
Abstract A modified method of registration of small‐angle scattering of polarized light using the principles of the Fraunhofer diffraction permits the study of fast processes of spherulitization with averaging from a large amount of the scattering elements (several million). With the aid of this method the dependencie…