Materials Literature
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The combined effect of an electric field and reduced dimensionality on the hopping motion of a charge carrier in an anisotropic molecular crystal is determined. New, exact expressions for S(t), the number of distinct sites occupied by a carrier in time t, are presented for two-dimensional and three-dimensional anisotr…
A series of new high-energy Fe-Cr-Co magnet alloys with (BH)max≃8–10 MG Oe have been developed. An Fe-22Cr-15Co alloy with equiaxed grain structure achieves (BH)max=8.3 MG Oe utilizing the abnormal shape of the miscibility gap of the system. The addition of Mo to the alloys enhances the anisotropic decomposition and t…
The systems and each contain six intermediate compounds of 4:1, 3:1, 1:1, 1:2, 1:3, and 1:5 ratios. The systems were investigated by solid‐state reactions and also by quenching methods in the glass‐forming region between the 1:2 and 1:5 compounds. The 4:1, 1:2, 1:3, and 1:5 compounds in the two systems appear to have…
Abstract A series of 2‐substituted 4 H ‐3,1‐benzoxazinones and 2,3‐disubstituted 4‐(3 H )quinazolinones have been synthesized in mild conditions by the use of triphenyl phosphite and pyridine as cyclising medium. Benzox‐azinones are produced either by ring closure of 2‐(acylamino)benzoic acids or in the reaction of be…
In this paper the Rayleigh hypothesis in the theory of reflection by a cylindrical perturbation in a plane surface is investigated analytically. The hypothesis asserts that above the surface the scattered field may be expanded in terms of outward‐going wave functions. As such, it is analogous to the assumption made by…
The increase of the shielding factor due to shaking was measured in a scale model for a magnetically shielded room. The increase was found to be 7 dB for a single-layer square cylinder biased by the Earth's magnetic field. The shielding factor of a large-volume three-layer Mumetal®room was estimated to increase by a f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures and properties of N-methyltetraphenylporphyrin complexes. Crystal and molecular structure and cyclic voltammetry of an air-stable iron(II) porphyrin: chloro(N-methyl-5,10,15,20-tetraphenylporphinato)iron(II)Oren P. Anderson, Alan B. Kopelove, and David K. Lavallee…
We have studied a two-dimensional ensemble of cylindrically symmetric particles interacting via a weak anisotropic potential using the Monte Carlo technique of computer simulation. The calculation is simplified by confining the particles to the sites of a triangular lattice. The internal energy, specific heat, second…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic approaches to planar carbon. 1Wolter Ten Hoeve and Hans WynbergCite this: J. Org. Chem. 1980, 45, 15, 2925–2930Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published inissue 1 July 1980https://pubs.acs.org/doi/10.1021/jo01303a0…
The passivation of copper anodes due to precipitation of copper sulfate on the anode surface was investigated as a function of electrolyte composition and temperature, and of anode composition. The slime layer present on the anode surface was shown to be the primary factor in causing passivation by inhibiting the diff…
Abstract Reaction injection molding includes aspects of polymerization reactor analysis as well as melt injection molding. Processing can be broken down into several unit operations: metering and machine performance, impingement mixing, mold filling, curing and mold design. Commercial RIM machines have been used succe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZinc porphyrin sensitized reduction of simple and functional quinones in micellar systemsMarie Paule Pileni and Michael GraetzelCite this: J. Phys. Chem. 1980, 84, 14, 1822–1825Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of [N(CH3)4]2[Mo2O2S2(S2)2]: a compound with two S22- ligandsWilliam Clegg, Nageswaran Mohan, Achim Mueller, Axel Neumann, Walter Rittner, and George M. SheldrickCite this: Inorg. Chem. 1980, 19, 7, 2066–2069Publication Date (Print):July 1, 19…
Hydrogen atoms in ferroelectric phase of CsH 2 PO 4 have been located from low temperature neutron diffraction experiment. Chains of hydrogen bonds extending to both the crystallographic b - and c -axes are confirmed. The hydrogen atom in a shorter O–H··O bond becomes ordered at low temperature phase with bond length…
Abstract Bildungsenthalpien Δ H f und geometrische Ringspannungen E g. Sp. für Cyclooctin ( 1 ) und die drei isomeren Cyclooctenine 5 – 7 werden nach der MINDO/2‐Methode auf der Basis vollständiger Geometrie‐Optimierungen berechnet. Mit den Frequenzen der CC‐Valenzschwingungen (Abb. 4) und mit den 13 C‐Verschiebungsw…
Isochronal annealing experiments on dc-sputtered indium tin oxide (ITO) films in inert (N2), reducing (N2/H2) and oxidizing atmospheres were cumulatively performed over the 50→500→50 °C range. Three anneal regimes have been identified. In region I, TA=50→200 °C, crystallization occurs, resulting in a sharp drop in she…
A clean Si(111) surface showing a 7×7 superlattice structure has been investigated in detail by RHEED with changes of azimuthal angle, glancing angle, and surface temperature. For the 7×7 structure, the mean intensity distribution of the reciprocal lattice rods was estimated from the intensity analysis of various RHEE…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRheooptical Studies of Racemic Poly(γ-benzyl glutamate) Liquid CrystalsTadahiro Asada, Hiromochi Muramatsu, Ryoji Watanabe, and Shigeharu OnogiCite this: Macromolecules 1980, 13, 4, 867–871Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Pub…
The crystallographic orientation of rf reactively sputtered ZnO has been characterized by x-ray diffraction after postdeposition heat treatment. Diffractometer measurements were made on as-deposited films as well as on films which were annealed up to 700°C. The heat treatment accounted for improved crystallite orienta…
Abstract UPS studies (21.2 and 40.8 eV) are performed on BaTiO 3 (001) and SrTiO 3 (100) surfaces. In both the compounds there is an enhanced emission at the top of the valence band for hv = 21.2 eV, which cannot be explained with the existing theoretical bulk densities of states. From the results of angle‐dependent U…