Materials Literature
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Using a "spatial correlation" model with a Gaussian correlation function we have for the first time quantitatively explained the broadening and asymmetry of the first-order longitudinal-optic phonon Raman spectrum induced by alloy potential fluctuations. The systems studied were the representative alloy semiconductors…
The electronic structures of substitutional 3d transition metal (TM) impurities in II-VI (ZnO, ZnS) and III-V (GaP) semiconductors have been calculated by the cluster method within the local density functional formalism. The calculated level structures of TM impurity states reveal a quantitative difference between II-…
Abstract Chemisch aus der Dampf phase abgeschiedene Borcarbide (B 4 C) weisen bei annähernd stöchiometrischer Zusammensetzung maximale Härte (H) und Bruchzähigkeit (Km) auf.
The coadsorption of low coverages of CO and potassium (${\ensuremath{\theta}}_{\mathrm{K}}<0.10$) on Ru(001) is characterized by a single adsorption state with a C-O stretching frequency of \ensuremath{\sim} 1460 ${\mathrm{cm}}^{\ensuremath{-}1}$. Vibrational overtone spectroscopy and isotopic scrambling in thermal…
Fire retardancy of wood involves a complex series of simultaneous chemical reactions, the products of which take part in subsequent reactions. Most fire retardants used for wood increase the dehydration reactions that occur during thermal degradation so that more char and fewer combustible volatiles are produced. The…
Some properties of a new type of membrane, a graded highly asymmetrical skinned micropo-rous membrane, are discribed and some of their rationale reviewed. The asymmetry of the new membranes as measured by the ratio of pore sizes of its two sides exceeds 100 and the pore size increases approximately exponentially acros…
Abstract The theory of the Auger processes of capture of charge carriers with the energy transfer to the bound charge carriers is extended to the case of a semiconductor with different valleys of the C‐band. Using hydrogen‐like Ψ‐functions for the charge carriers in the impurity centres separated with distances higher…
Laboratory tests were conducted on iron, nickel, titanium, and cobalt base alloys and zirconium 702, primarily at temperatures of 95 to 400 C for exposure periods of 15 days in a 60 vol% H2O, 40 vol%o HCl gaseous mixture. Two alloys were also exposed for a period of 66 days. Field tests were conducted in a rotary calc…
MnAl and MnBi ribbons were made from the molten alloys by the single-roller rapid-quenching technique, and their crystallographical, mechanical and magnetic properties were studied. Long, flexible MnAl ribbons were produced, and the ferromagnetic τ-phase was obtained by a simple annealing treatment. The best magnetic…
The incorrect assignment of atom type leads not only to incorrect thermal parameters but in unfavourable circumstances, such as having a limited data set or through overweighting low-order reflections, to incorrect bond distances.
The electrochemistry of glassy melt‐spun 60 atom percent (a/o) Ni‐40 a/o Nb was investigated at moderate temperatures in various aqueous media. The alloy was very corrosion resistant to most acids and alkalis, but it was attacked by aqueous . Cyclic voltammograms of the glassy alloy in indicated the existence of a thi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance spectra of low-symmetry rare-earth complexes: tetraphenylarsonium pentakis(nitrato)ytterbate(III)W. Urland and R. KremerCite this: Inorg. Chem. 1984, 23, 11, 1550–1553Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Pu…
Using a single crystal of a substance showing the metal-insulator transition, V 6 O 13 , the microscopic magnetic properties in the metallic, insulating and antiferromagnetic states have been investigated by means of the pulsed NMR technique. In the metallic state the Knight shift and the nuclear-spin lattice relaxati…
The effects of the drawing conditions, OH content and irradiation temperature on radiation-induced optical absorption bands in step-index fibers with pure silica cores clad with silicone or F-doped silica have been investigated. A loss peak was induced at 770 nm in silicone-clad fibers with both low and high OH-conten…
The 181 Ta nuclear quadrupole resonance (NQR) study of 1 T -TaS 2 has been made at 4.2 K in the frequency range from 75 MHz to 235 MHz in order to obtain detailed information on the superlattice structure in the commensurate charge density wave state. NQR signals from inequivalent Ta sites are divided into three group…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and properties of trans-1,4-polyisoprene crystallized from solutionC. C. Kuo and Arthur E. WoodwardCite this: Macromolecules 1984, 17, 5, 1034–1041Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published inissue 1 May 1984https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal behavior of random copolymers of methacrylic acid and tert-butyl methacrylateJuey H. LaiCite this: Macromolecules 1984, 17, 5, 1010–1012Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published inissue 1 May 1984https://pubs.acs.org/…
A technique was developed and used to measure the rotatory power of 90° twisted nematic liquid crystals in the visible and infrared spectral regions. Experimental results for two liquid crystal mixtures, BDH-E7 and ZLI-1132, are in very good agreement with theoretical calculations for a wide spectral range and for dif…
Application of the Rayleigh criterion for the limit of resolution of a simple lens with axial illumination leads to the value 0.61λ. In two-dimensional electron density maps based on X-ray data, the limit of resolution has been considered to be 0.61 dmin, the counterpart of the optical case, and in three-dimensional m…
When the growth medium of Clostridium acidiurici was supplemented with trace metals, glycine synthase and glycine-CO2 exchange activities in cell-free extracts were found to increase significantly. The glycine-CO2 exchange system was purified and shown to consist of a heat-labile component and a heat-stable component.…