Materials Literature
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Phases can be determined for geometrically redundant amplitudes by iteration of the following procedure: compute an electron density map from the currently available phases; average the electron densities of all the crystallographically independent molecules; rebuild the crystal(s) from this averaged subunit, setting…
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Abstract Electronic spectra of several TCNQ, complexes have been measured with single crystals by the transmission method. The assignment of electronic transitions are presented based on the electronic structure of the crystals. The molecular viewpoint is stressed in a theoretical treatment. The spectra are interprete…
Continuum plasticity is used to derive a new model for the plastic zone of secondary dislocations (B structure) observed around undeformable particles in a plastically deformed metal matrix. The model is compatible with observations of these dislocations by electron microscopy. The contribution of these dislocations t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of nickel-tungsten-alumina catalysts by x-ray photoelectron spectroscopyKung T. Ng and David M. HerculesCite this: J. Phys. Chem. 1976, 80, 19, 2094–2102Publication Date (Print):September 1, 1976Publication History Published online1 May 2002Published inissue 1 Septem…
Abstract: The energies of planar vs. tetrahedral geometries of tetracoordinate organic molecules have been surveyed by ab initio molecular orbital calculations. Because of their 7 ~ acceptor and u donor character, electropositive substituents, especially lithium, are particularly effective in stabilizing the planar ar…
Abstract The thermal conductivity of a solid or gas filled polymer is used in processing or end use application calculations. Numerous theoretical and empirical correlations are found in the literature. A careful review of these models indictes that no one correlation or technique accurately predicts the thermal condu…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelation between the singlet-triplet splitting and the copper-oxygen-copper bridge angle in hydroxo-bridged copper dimersVan H. Crawford, H. Wayne. Richardson, John R. Wasson, Derek J. Hodgson, and William E. HatfieldCite this: Inorg. Chem. 1976, 15, 9, 2107–2110Publication…
A figure of merit for transparent electrode materials has been defined by φTC=T10/Rs, where T is the optical transmission and Rs is the electrical sheet resistance. Expressions are derived to predict the transparent electrode properties of a material from its fundamental electrical and optical constants. The performan…
The principal chemical and kinetic results obtained for this reaction are reported and discussed critically. A brief description is given of its industrial application to the manufacture of nitroalkanes. The detailed mechanism suggested during recent years for the nitration of alkanes by nitrogen dioxide is discussed…
Inelastic neutron scattering experiments on an ordered Invar alloy ${\mathrm{Fe}}_{3}$Pt show large softening of the [100]TA and [110]T${\mathrm{A}}_{1}$ acoustic shear modes below the Curie temperature. In addition, a central peak is observed below 100 K, which, however, behaves noncritically. The phonon softening is…
Measurements of the variation of the dielectric constant with temperature at 11 GHz and between 0.4 and 14K have shown that the coupling between electromagnetic waves and the low-energy excitations present in vitreous silica strongly depends on the concentration of OH - ions. This result can be explained by an increas…