Materials Literature
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Appearance of satellite lines in the X-ray photoelectron emission from the 2 p -shell of the metal ion transition-metal compounds are ascribed to the increase of covalency due to the creation of an inner-core hole. For this argument a simple two-configuration model is used, which reveals a shortcoming once ab initio c…
A ternary addition in the binary solution of an impurity in a metal can reduce the solubility and enhance the grain-boundary segregation of the impurity. Showing that both phenomena have a common thermodynamic basis makes it possible to predict segregation behaviour in ternary systems with the help of solubility data.…
Self-diffusion coefficients of nitrogen in polycrystalline alpha- and beta-silicon nitride were measured by a gas–solid isotope exchange technique using 15N as a tracer at temperatures in the range 1200–1410°C. The diffusion coefficients for single-crystal grains can be expressed as D (cm2/sec) =1.2×10−12 exp(−55 700/…
Oxygen-rich precipitates in silicon, and the generation of dislocations at the interfaces between the precipitates and the matrix were observed. The precipitates are square-shaped plates with ⟨110⟩ sides and {100} habit planes. Prismatic dislocation loops are generated in silicon by the mechanism of prismatic punching…
Dipolar fluctuations of 4 s and 4 p holes in the elements around Xe have been found to make a one-electron type of picture break down. This explains the failure of monopole relaxation, as included e.g. through the relativistic Hartree-Fock ΔSCF procedure, and shake off processes to describe ESCA spectra in this energy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural study and properties of the alkali metal, nitrosyl, and ammonium hepta- and octafluorouranates(VI)R. Bougon, P. Charpin, J. P. Desmoulin, and J. G. MalmCite this: Inorg. Chem. 1976, 15, 10, 2532–2540Publication Date (Print):October 1, 1976Publication History Publi…
The crystal structure of adamite, Znr(AsO.)(OH), has been solved by direct methods and refined by full-matrix least-squares to R : 0.0402 (Rw = 0.0302) using 1472 equi-inclination counter data recorded with graphite-monochromatized MoKa radiation. The structure is orthorhombic, Pnnm(Drrfl) with a : 8.306(4), b = 8.524…
In recent years the physics of amorphous semiconductors has developed into a field so extensive and ramified that it is difficult to review in one paper. Various researchers emphasize different achievements; my choice of these is based on an attempt to give the reader an idea of the breadth of the research—from fundam…
This paper is related to the new stress corrosion cracking phenomenon of mild and low alloy steels in a CO/CO2 environment. The incidents of cracking are described and these were reproduced by laboratory tests. The results obtained are as follows: (1) No stress corrosion cracking of mild steel was found to occur in wa…
Abstract Free‐radical formation in various modifications of celluloses, namely, wood cellulose I, II, III, and IV, rayon cellulose, amorphous cellulose, cotton linters, and absorbent cotton, irradiated with ultraviolet light, has been studied by means of ESR spectroscopy at 77°K. Various types of free radicals were ge…
The new ternary compounds NaAlSe 2 , NaAlTe 2 , NaGaTe 2 and KAlTe 2 crystallize in the Tl I Tl III Se 2 -structure type. The analogous Tl-compounds build up the same structure but show a variable composition within the limits (Na x Tl 1-x )TlSe 2 (0 < x < 0.47) and (K x Tl 1-x )TlSe 2 (0 < x &…
Correlations of experimental data on heat transfer from nonboiling, horizontal fluid layers with internal heat generation have been cast into a form suitable for analysis of postaccident heat removal in fast reactors. Available data on layers with equal boundary temperatures indicate that the downward heat transfer ra…
Abstract Glauconite pellets in the Cambrian of the central U.S.A. frequently contain two textural forms of glauconite–aggregate and oriented—which differ in both mineralogy and chemistry. The aggregate glauconite composes the bulk of most pellets and consists of crystals in a nearly random arrangement. The oriented gl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure of chetominA. G. McInnes, A. Taylor, and J. A. WalterCite this: J. Am. Chem. Soc. 1976, 98, 21, 6741Publication Date (Print):October 1, 1976Publication History Published online1 May 2002Published inissue 1 October 1976https://pubs.acs.org/doi/10.1021/ja00437a07…
High-efficiency silicon solar cells have been reported that use a surface alteration to reduce reflection. The process here reported purposely alters the cell surface with an anistropic etching in ternary mixtures of KOH, H2O, and ethyl glycol. Wafers were "sensitized" with a carbon compound to insure etching uniformi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics and thermodynamics of axial ligation in metalloporphyrins. 5. Affinity of ferric porphyrins for nitrogenous bases and the stoichiometry and spin states of the product complexesJames D. Satterlee, Gerd N. La Mar, and James S. FryeCite this: J. Am. Chem. Soc. 1976, 98…
The theory of the longitudinal vibrations of a composite ’’crystalline-amorphous’’ elastic rod with perturbing forces at the ends has been developed. The longitudinal-acoustic-mode fundamental frequencies are tabulated as a function of the relative elastic moduli, relative densities, and relative composition of the co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular stereochemistry of a nitrogen-bridged metalloporphyrin: .mu.-nitrido-bis[.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatoiron]W. Robert Scheidt, David A. Summerville, and Irwin A. CohenCite this: J. Am. Chem. Soc. 1976, 98, 21, 6623–6628Publication Date (Print)…
The angle between the nematic director and an aligning surface in contact with a nematic phase is of importance in defining the mechanism of surface alignment of liquid crystals. A new and simple optical method of determining this tilt angle is described, and measurements are reported on a number of homologues of the…
Thermal-expansion measurements were made for five varieties of mixed-alkali silicate glasses (Na-K, Na-Rb, Na-Cs, K-Rb, and K-Cs), with special emphasis on the Na-K silicates. Negative deviations from additivity were observed in the glass transformation temperature in every case, with the deviations increasing with to…