Materials Literature
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The potential, charge density, energy spectrum, and occupied surface density of states are calculated selfconsistently for two currently popular structural models of the stable 2 \ifmmode\times\else\texttimes\fi{} 1 reconstruction of the Si (100) surface. The features which emerge are discussed in terms of their relat…
X-ray and electron beam diffraction analyses have been carried out on thin films deposited from a beam of carbon ions. Results show that the films consist of a polycrystalline background of cubic diamond with a particle size of 50–100 Å with single-crystal regions up to 5 μm in diameter.
An empirical nonlocal pseudopotential scheme is employed to calculate the electronic structure of eleven semiconductors: Si, Ge, $\ensuremath{\alpha}\ensuremath{-}\mathrm{Sn}$, GaP, GaAs, GaSb, InP, InAs, InSb, ZnSe, and CdTe. Band structures, reflectivity spectra, electronic densities of states, and valence charge de…
High-resolution x-ray-photoemitted valence-electron spectra from a gold single crystal are found to exhibit significant differences for electron emission along various low-index directions, with $〈100〉$ and $〈111〉$ showing the most pronounced dissimilarities. Direct-transition-model calculations predict that such spec…
The impact properties of composites of glass fibre or carbon fibre in polyester or epoxy resin were studied. Impact was by high-velocity water jets ( approximately 700 ms -1 ), which previous work has shown successfully simulate rain erosion damage and other impact situations involving high-stress (of the order of 1 G…
Abstract Cellulose ion exchangers with particles of spherical shape were prepared via chemical transformations of bead cellulose. The products were characterized by measuring their exchange capacity, swelling and by elemental analysis. The spherical shape of the particles was not distorted by chemical reactions. The f…
It is shown that recently reported two-electron, one-photon $K$---x-ray transition energies for collision-excited Fe and Ni ions can be described on the basis of Hartree-Fock calculations, provided that multiple ionic excitation and selection rules for $E1$ transitions are taken into account.
A model calculation shows that each phonon band which couples to the electron density in an organic linear-chain semiconductor effectively develops an infrared activity along the chain axis. The origin of the effect lies in phase oscillations of additional charge-density-wave distortions which inevitably arise in the…
The infrared absorption and the laser excited Raman spectra of BaCl 2 · 2H 2 O powder have been analyzed. The force constants k H and k H governing the librational modes of H 2 O molecules in this crystal are also reported.
Abstract The n.m.r. variable temperature behaviour of the 7‐membered ring in 1,3‐dihydro‐2 H ‐1,5‐benzodiazepin‐2‐one derivatives and in the corresponding 2‐thiones has been investigated. The results indicate that the ring inversion barrier is higher in the thiones and dependent on substituents bonded at N‐1. The acti…
Abstract not Available.
Linear perturbation theory is used to analyze the stability of a moving planar alloy‐oxide interface when oxidation of a binary solid solution alloy leads to growth of a superficial metal conducting oxide scale. The transport equations for metal and oxygen in the alloy and oxide phases are analyzed under limiting appr…
Zirconium(IV) carboxylates, Zr(OOCR)4 where R = Me, Et, CH2Cl2 CHCl2 and CCl3, have been prepared by the reaction of zirconium(IV) chloride and carboxylic acids. The compounds have been characterized by elementary analyses, thermogravimetry and infrared spectral data. The compounds are non-electrolytes in nitrobenzene…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContact vs. pseudocontact contributions to lanthanide-induced shifts in the nuclear magnetic resonance spectra of isoquinoline and of endo-norbornenolOtto A. Gansow, Paul A. Loeffler, Raymond E. Davis, Robert E. Lenkinski, and M. Robert Wilcott IIICite this: J. Am. Chem. Soc…
The production of domains during the application of a magnetic field on a bulk sample of nematic liquid crystal is shown. These domains are created during the process of realignment of the nematic directors and have many similar features to the domains created by electric fields (in the conduction regime). These domai…
The effects which low-temperature electron irradiation have on the photoluminescence from Si provide new information regarding irradiation-induced defects which participate in radiative recombination. Previous identifications of the 0.8–1.0-eV band with the divacancy and the 0.6–0.8-eV band with the Si-G15 (or K) cent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComputation of Multicomponent, Multiphase EquilibriumBoyd George, L. P. Brown, C. H. Farmer, Paul Buthod, and F. S. ManningCite this: Ind. Eng. Chem. Process Des. Dev. 1976, 15, 3, 372–377Publication Date (Print):July 1, 1976Publication History Published online1 May 2002Publ…
Abstract The phenomenon of flow‐induced crystallization was investigated using a linear polyethylene above its normal melting point flowing continuously in a Biconical Rheometer. It was found that the resin crystallized in the superheated state at rates which increased with increasing shear rate and decreasing tempera…
Gamma irradiation was found to release iodine in small amounts from powdered samples of cesium iodide and barium iodide, but not from zirconium iodides. The amount of iodine released was measured with silver foil detectors in sealed capsules that contained the salt. The amount of release was markedly affected by impur…
Following a brief introductory remark on the holographic grating, the possibility of designing concave gratings for a specific application is discussed, giving basic ideas of the grating design, actual design procedures, and feasible ways of improving the existing design methods. As a proof of the usefulness of the de…