Materials Literature
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The kinetics of corrosion were measured by accelerated oxidation tests on Co‐30Cr and Ni‐30Cr as a function of temperature from 600°–900°C, in the environment and deposit composition. The alloys were rapidly attacked at temperatures between 650° and 750°C when a liquid sulfate phase was obtained from an initially pure…
Abstract Thirty two boehmites, synthesized at temperatures ranging from room temperature to 300°C, were examined by scanning electron microscopy, transmission electron microscopy, electron diffraction, X-ray powder diffraction, differential thermal analysis, and infrared spectroscopy. The results show that boehmite ex…
The kinetics of polymer growth and especially gelation are discussed for a system of reacting f-functional monomeric units. The gelation models of Flory and Stockmayer are examined, and their implications concerning sol–gel interaction after gelation has occurred are clarified. A new model, in which the gel does not c…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical, spectral, structural, and charge transport properties of the "molecular metals" produced by iodination of nickel phthalocyanineCharles J. Schramm, Raymond P. Scaringe, Djordje R. Stojakovic, Brian M. Hoffman, James A. Ibers, and Tobin J. MarksCite this: J. Am. Chem…
Abstract XPS and AES have been applied to the surface analysis of antimony oxides, Sb 2 O 3 , Sb 2 O 4 and Sb 2 O 5 . By means of the computer‐operated separation of oxygen and antimony contribution, the oxygen to metal atomic ratios calculated from XPS data were found to be close to the expected values. An antimony p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer films on electrodes. 4. Nafion-coated electrodes and electrogenerated chemiluminescence of surface-attached tris(2,2'-bipyridine)ruthenium(2+)Israel Rubinstein and Allen J. BardCite this: J. Am. Chem. Soc. 1980, 102, 21, 6641–6642Publication Date (Print):October 8, 1…
A model for Raman scattering by a molecule adsorbed at the surface of a spherical particle is articulated by treating the molecule as a classical electric dipole. This follows Moskovits's suggestion [J. Chem. Phys. 69, 4159 (1978)] and the experiments by Creighton et al. [J. Chem. Soc. Faraday Trans. II, 75, 790 (1979…
The unusual low-temperature behavior of liquid water is interpreted using a simple model based upon connectivity concepts from correlated-site percolation theory. Emphasis is placed on examining the physical implications of the continuous hydrogen-bonded network (or ’’gel’’) formed by water molecules. Each water molec…
The distribution function of relaxation times underlying the nonexponential relaxation function of Williams and Watts is derived and compared with the analogous Cole–Davidson distribution function. In order to make the comparison between the two distribution functions, a simple empirical relationship between the Cole–…
A theory for surface enhanced Raman scattering (SERS) is developed. Effects due to realistic surface geometry and dielectric properties are included. Three sources of enhanced Raman scattering are noted: the image dipole enhancement effect, the increase of local field (’’lightning rod’’ effect), and the resonant excit…
The author shows that in materials with orbital degeneracy, the crystallographic and magnetic structures are strongly connected: the exchange interactions depend on the occupied orbitals, which are related to the crystallographic distortions. In the case of triply degenerate states, they point out the importance of th…
CONTENTS 1. Introduction 551 2. Theoretical models of the semiconductor-metal transition in disordered systems 552 3. Semiconductor-metal transition in molten semiconductors at high temperatures 561 4. Semiconductor-metal transition and criterion for minimal metallic conductivity of melts at T>Tmp 564 5. Metal-semicon…
The absoulte spin susceptibility of As${\mathrm{F}}_{5}$-doped trans-polyacetylene, ${[\mathrm{CH}{(\mathrm{As}{\mathrm{F}}_{5})}_{y}]}_{x}$, was determined by spin resonance techniques for $0.0004<~y<~0.138$. The Curie-law contribution decreases above $y=0.001$ to a level less than 1 ppm in the highly conductin…
A matrix method (valid in the strong-field limit) is described for evaluating the second-order perturbation theory energy levels to be associated with the spin Hamiltonian H s = mu B S.g.B+S.D.S+I.A.S+I.p.I for the most general symmetry conditions. The method is concise and completely avoids the need for introducing E…
Abstract Review: 21 Literaturhinweise vo und HEUER, A. H.; J. Am.
Band representations of space groups are defined and they are used for the symmetry specification of bands in solids. While the symmetry of atomic orbitals is specified around a single center, the band symmetry of a solid is defined with respect to a whole lattice of centers.
The phase diagram of the ternary system potassium laurate-1-decanol-D$_{2}\mathrm{O}$ was studied over concentration ranges where nematic phases are likely to occur. Two uniaxial nematic phases which are separated by a biaxial nematic phase are found. In limited concentration range the following phase sequence may be…
The crystal structure if RbH 2 PO 4 has been determined by neutron diffraction at room temperature and T c +5K in the tetragonal (paraelectric) phase using single-crystal samples. The techniques of constrained refinement and statistical testing have been used to examine carefully the significance of some pertinent str…
SnO 2 single crystals have been grown by use of vapour-phase reaction method. The crystals obtained are characterised by chemical analysis and electrical measurements. The density of the crystals was determined as 6.994+or-0.001 g cm -3 . The thermal conductivity measured is discussed for different orientations of the…