Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of hydrogen absorption by lanthanum-nickel (LaNi5)S. Tanaka, J. D. Clewley, and Ted B. FlanaganCite this: J. Phys. Chem. 1977, 81, 17, 1684–1688Publication Date (Print):August 1, 1977Publication History Published online1 May 2002Published inissue 1 August 1977https:…
The chemical constitution of the passive oxide films formed on aluminum in chromate and chromate/chloride solutions under simple immersion (at open‐circuit potential) and under anodic polarization has been investigated by means of x‐ray photoelectron spectroscopy. It has been shown that these films, whose thickness is…
Abstract The complex dielectric constant ϵ of thick Cu and Ag films on fused quartz substrates is determined at 300 and 1.5 K by a modified v. Fragstein‐Kampermann method in the spectral region between 0.41 and 0.71 m̈n. The relaxation frequency of the conduction electrons is determined and the contributions of electr…
SUMMARY Considerable strides have been made in the application of the cathodoluminescent and beam‐induced current modes of operation of the scanning electron microscope to the high resolution characterization of semiconductor materials. These techniques can be used to measure parameters such as resistivity, carrier co…
The intensity of the X-ray diffuse scattering from an electron-phonon system is calculated correct up to the second order of the electron-phonon interaction. The result consists of two terms: one is described as arising from softening of the phonon frequency due to the interaction, and the other as the shift of the ce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance spectra and spin-Hamiltonian parameters for trigonal-bipyramidal nickel(I) and copper(II) complexesRolando. Barbucci, Alessandro. Bencini, and Dante. GatteschiCite this: Inorg. Chem. 1977, 16, 8, 2117–2120Publication Date (Print):August 1, 1977Publica…
Abstract Dynamic viscosity and elastic modulus for a low molecular weight styrene‐butadiene‐styrene (SBS) block copolymer ate measured as a function of temperature (80‐170°C) and frequency using the eccentric rotating disc geometry. These linear properties are superimposed to yield master curves each of which exhibits…
It was recently suggested that the electron affinity may pose an additional upper limit on the charge of a single particle in a plasma, in addition to the electron field emission limit. Here we will, however, show that these two limits both rely on the same physical process and that the limit is only relevant for smal…
Two independent isolates of Saccharomyces cerevisiae lacking hexokinase activity (EC 2.7.1.1) are described. Both mutant strains grow on glucose but are unable to grow on fructose, and contain two mutant genes hxk1 and hxk2 each. The mutations are recessive and noncomplementing. Genetic analysis suggests that these tw…
A strong temperature dependence has been observed for the first time in angle-resolved photoemission (ARP) spectra of the valence band of a crystalline solid. This spectral behavior confirms predictions of a model suggested by Shevchik. A controversial point in the interpretation of ARP spectra at x-ray energies is re…
Abstract The electrical conductivity of a wide variety of organic materials is reviewed and a comparison made between those materials which transport charge efficiently and those that do not. This comparison reveals that the most efficient conductors contain molecules (a) whose radical ions form a new aromatic sextet…
The number of structural isomers obtainable from all possible substitutions in an alicyclic hydrocarbon is found by the use of Burnside's Lemma. Four classes of compounds exist according to the number of vertices of the ring, and the number and type of substituents on the carbons. The theory is also applicable to othe…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleElectron spin resonance spectra of low-symmetry pseudotetrahedral high-spin cobalt(II) complexes. Tetra-n-butylammonium tribromo(quinoline)cobaltate(II)A. Bencini and D. GatteschiCite this: Inorg. Chem. 1977, 16, 8, 2141–2142Publication Date (Print):August 1, 1977Publication His…
The pressure-temperature phase diagram of ferroelectric NH 4 HSO 4 was studied by means of dielectric and differential thermal analysis (DTA) measurements in a pressure and temperature region of \(p{\lesssim}8\times10^{3}\) kg cm -2 , –120°C \({\lesssim}T{\lesssim}\)200°C. The high pressure phase found by Bridgman abo…
Abstract Es werden die Ergebnisse der röntgenographischen Einkristallstruktur‐untersuchung des auf den Oktaederplätzen geordneten hexagonalen Elpasoliths Ba (NiSb 2 ) (6) O 9 mitgeteilt. (Raumgruppe: C ; a = b = 5,837 Å, c = 14,392 Å; Z = 2). Das Gitter besteht aus dichtest gepackten BaO 3 ‐Schichten mit der Stapelfol…
Abstract The G HCI values of γ‐irradiated PVC mixtures were studied after addition of various amounts of three epoxy stabilizers: diglycidyl ether of 2,2‐bis(4‐hydroxy‐3‐methylphenyl)propane (I); diglycidyl ether of 1,1‐bis(4‐hydroxyphenyl)cyclohexane (II), and butyl‐ cis ‐9,10‐epoxystearate (III). The results indicat…
Abstract 4′-Vinylbenzo-15-crown-5 was conveniently synthesized in 30% yield by the reaction of diazotized 4′-aminobenzo-15-crown-5 with ethylene (6–10 kg/cm2) in the presence of zerovalent palladium at room temperature.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of magnesium bromide-tetrahydrofuran complexes: bis(tetrahydrofuran)magnesium bromide, orthorhombic, and diaquotetrakis(tetrahydrofuran)magnesium bromide, triclinicRaghupathy Sarma, Fausto Ramirez, Brian McKeever, Yu Fen Chaw, James F. Marecek…
The first stable, high molecular weight phosphazene polymers that contain alkyl- or aryl- groups bonded directly to phosphorus have been synthesized by the interaction of organolithium or dialkylmagnesium reagents with poly-(difluorophosphazene). The polymers are elastomers or tough, flexible, film-forming materials.