Materials Literature
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Abstract Man erhält die Substanzen in kristallinerform durch Umsetzung der reinen Alkalimetalle mit den Chalkogenen in flüssigem Ammoniak im Molverhältnis 2:3 bei Drucken bis zu 3000 bar und Temperaturen um 600 K. Sie kristallisieren alle im K 2 S 3 ‐Typ (Raumgruppe Cmc2 1 (Nr. 36)). Ihre Gitterkonstanten lauten: Das…
The general theory of nuclear-spin relaxation induced by translational self-diffusion in liquid crystals developed in a previous paper is applied to the smectic $A$ phase. The inter- and intralayer molecular jumps, the spin distribution, and the elongated shape of the molecules are taken into account. Results are obta…
Abstract Characterization studies on a series of coprecipitated alumina‐supported nickel methanation catalysts by X‐ray photoelectron spectroscopy are described. Binding energies and spectral shapes have been determined for several standard compounds (Ni, NiO, Ni(OH) 2 , NiAl 2 O 4 , Al 2 O 3 ) to provide background i…
Emission and excitation spectra of Eu 2+ ions incorporated in MgS, CaS and CaSe were measured at temperatures 300, 80 and 6 K. Both spectra are interpreted as due to the allowed transition between the Eu 2+ ion's ground state ( 8 S 7/2 ) of 4f 7 configuration and the excited states of 4f 6 5d configuration, together w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of three tetrakis(carboxylato)dirhodium(II) adducts in which carboxylate groups and axial ligands are variedF. Albert Cotton and Timothy R. FelthouseCite this: Inorg. Chem. 1980, 19, 2, 323–328Publication Date (Print):February 1, 1980Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic methods. 15. Unsaturated acyl derivatives of silicon, germanium, and tin from metalated enol ethersJohn A. Soderquist and Alfred HassnerCite this: J. Am. Chem. Soc. 1980, 102, 5, 1577–1583Publication Date (Print):February 1, 1980Publication History Published online…
Abstract Es wurden Möglichkeiten untersucht, Na 3 PO 4 auf festkörperchemischen Wegen darzustellen. Differentialthermoanalytisch und röntgenographisch ließen sich im untersuchten Temperaturbereich (25–800°C) zwei Modifikationen nachweisen. Die reversible Phasenumwandlung ist 1. Art und erfolgt bei 325°C. Die Kristalls…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThree-carbon annelations. Regiocontrolled reactivity of trimethylsilyl- and ethoxyethyl-protected cyanohydrins. Versatile homoenolate and acyl anion equivalentsRichard M. Jacobson, George P. Lahm, and John W. CladerCite this: J. Org. Chem. 1980, 45, 3, 395–405Publication Dat…
Single-ion luminescence due to Mn 2+ and donor-acceptor pair luminescence due to (Cu, Al), (Ag, Al) and (Au, Al) centered in hexagonal ZnS have been investigated at 75 K with a major focus on exciton structures in the excitation spectra. Appearance of exciton peaks in Mn 2+ luminescence excitation spectra indicates th…
Abstract Molecular structural changes of a vinyl functional silane coupling agent on E ‐glass fibers, induced during the immersion test in hot water, have been studied using Fourier transform infrared spectroscopy. The amount of the coupling agent on the glass fibers is reduced by hydrolytic degradation. Silanol group…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOctakis(alkylthio)tetraazaporphyrinsCharles J. Schramm and Brian M. HoffmanCite this: Inorg. Chem. 1980, 19, 2, 383–385Publication Date (Print):February 1, 1980Publication History Published online1 May 2002Published inissue 1 February 1980https://pubs.acs.org/doi/10.1021/ic5…
1. The skin of the American eel Anguilla rostrata is composed largely of a crossed-helical array of fibers, believed to be collagen, that are oriented at an angle of 45° with the long axis of the fish. Uniaxial and biaxial tension testing of eel skin was used to assess the role of the collagen fibers in the locomotor…
The M\"ossbauer effect has been used to study hydrogen absorption in Dy, Dy${\mathrm{Ni}}_{2}$, Dy${\mathrm{Co}}_{2}$, Dy${\mathrm{Mn}}_{2}$, and Dy${\mathrm{Fe}}_{2}$. Isomer shifts in the hydrides of the intermetallics are similar to those found in the dysprosium hydrides. Measurements at 4.2 K for the hydrides of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn explanation of unusual properties of spin-crossover ferric complexesMuin S. Haddad, Wayne D. Federer, Michael W. Lynch, and David N. HendricksonCite this: J. Am. Chem. Soc. 1980, 102, 4, 1468–1470Publication Date (Print):February 1, 1980Publication History Published onlin…
The correlation between electrical and mechanical losses in ferroelectric ceramics has been investigated theoretically and experimentally. The theoretical derivation is based on the assumption that both loss types are induced by 90° domain walls moving under the influence of electrical or mechanical fields. A proporti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical spectra of sonoluminescence from transient and stable cavitation in water saturated with various gasesC. Sehgal, R. G. Sutherland, and R. E. VerrallCite this: J. Phys. Chem. 1980, 84, 4, 388–395Publication Date (Print):February 1, 1980Publication History Published on…
We report the determination of the impact ionization rates for holes and electrons in Ga0.47In0.53As with the electric field oriented in the 〈100〉 direction. Our measurements show that the ionization rate for electrons α is greater than that for holes (β) by about a factor of 2 over electric fields ranging from 2.0×10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of porphyrin ferryl (FeO2+) complexes through the addition of nitrogen bases to peroxo-bridged iron(III) porphyrinsDer-Hang Chin, Alan L. Balch, and Gerd N. La MarCite this: J. Am. Chem. Soc. 1980, 102, 4, 1446–1448Publication Date (Print):February 1, 1980Publicati…
This paper describes an investigation into the growth of electrical trees in polyethylene by the simultaneous measurement of light intensity and partial discharges. The emission of light has been studied using an image intensifier. A comparison of the results obtained for different types of trees has been made. The de…
Abstract Neue Farbstoffe wurden synthetisiert, die ein ionenselektives Kronenethersystem enthalten, bei dessen Komplexierung mit Kationen der Chromophor im Grund‐ und angeregten Zustand elektronisch unterschiedlich beeinflußt wird. Verschiedene Ionentypen rufen verschiedene Farbänderungen hervor. Außer cyclischen Kron…