The Effect of Potential and Time on Deposition Characteristics of Zinc on a Zinc Single Crystal in KOH
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Photoelectrochemical Processes on Silver-Silver Oxide Electrodes
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…
Single-crystal polarized spectrum and paramagnetic anisotropy of five-co-ordinate, square pyramidal cobalt(II) complexes
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…
Single-crystal electronic and electron spin resonance spectra of 2,2′-bipyridylbis(hexafluoroacetylacetonato)copper( II )
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…
Antimicrobial Activity of Akanda (<i>Calotropis gigantea</i> L.) on Some Pathogenic Bacteria.
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…
Heat of formation of gallium(I) tetrachlorogallate(III) and the chloride-gallium trichloride bond energy
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…
Computed Radial Stresses In A Concrete TargetPenetrated By A Steel Projectile
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.
General Threshold Theory of Electronic Emission from the Surface of a Metal
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…
Single-crystal polarized spectrum and paramagnetic anisotropy of five-co-ordinate square pyramidal nickel(II) complexes
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…
Crystal structure of tilleyite: Refinement and coordination
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…
Electron Microscopic and Kinetic Study of the Flocculation of Calcium Montmorillonite
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…
Free convection melting of ice spheres
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…
Propriétés métamagnétique s d'un monocristal de ErCrO3
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…
The growth of large single-crystal Bi4Ti3O12
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 X-ray crystal structure of a low-spin pseudo-octahedral complex of iron(II)
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.
Far-infrared and Raman spectra of tetrahalogeno-complexes of arsenic(III), antimony(III), and bismuth(III)
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…
Strukturermittlung spezifisch 14C‐markierter Sorbosebräunungspolymerisate durch thermische Fragmentierung
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…
Morphology and kinetics studies of spherulitization of polyethylene terephthalate
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…
Formation of a tangsten phenyl hydride derivatives from benzene
In the presence of dienes the dihydride (πC5H5)2 WH2 reacts with benzene to give the phenyl derivative (πC5H5)2 WHPh.
Localized and Self‐Trapped Excitons in CsI
Abstract Additionally to the well‐known 3380 Å band in the excitonic transitions of CsI at LHeT a new emission band at 2900 Å is reported and its behaviour is studied as a function of temperature. Experimental evidence is given which establishes the connection of the 2275 Å absorption band with localized exciton trans…