Materials Literature
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Electrophysical properties and photoconductivity of several binary (PbTiO3, PbZrO3, PbHfO3) and ternary (Pb2ScNbO6, Pb2InNbO6) lead-containing perovskite-type oxides were investigated. Band gap energies for all studied compounds were measured to be somewhat smaller than for its perovskite analogs not containing lead.…
A double dipole model of the macrocyclic ring current in the dihydroporphyrin ring of chlorophyll derivatives is presented and parameterized. The model includes a close-range approximation that has both first-order and second-order continuity at all points in space, except through the current loop itself. The model is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDoubly bridged double cubanes containing MFe3S4 clusters (M = Mo, W). Synthesis, structure, and conversion to spin-quartet single clusters in solutionW. H. Armstrong, P. K. Mascharak, and R. H. HolmCite this: J. Am. Chem. Soc. 1982, 104, 16, 4373–4383Publication Date (Print)…
Weight loss which occurs while sintering composited Si 3 N 4 powders requires the loss of one or more of the end‐member constituents through a volatilization reaction. By plotting the direction of the compositional change on the appropriate equivalence phase diagram, the principal volatilization reaction can be determ…
An electron spectrometer allowing energy- and angle-resolved spin-polarized photoemission from ferromagnets is described. The system is designed for use with samples magnetized perpendicular to the photoelectron extraction direction (transverse magnetization geometry) and a Mott detector (100 keV) for the spin-polariz…
Abstract The thermomechanical behavior of particle composites was investigated in their transition region. In particular, the value of the glass‐transition temperature T g , which constitutes an upper limit for the structurally important glassy region, was examined. According to experimental evidence existing in the l…
An amorphous thin plate of vanadium pentoxide, V2O5, prepared by ultrafast quenching from the melt (splat-cooling) has been examined by large-angle X-ray scattering (LAXS) and its structure thereby investigated. The intensities at 450 points within the θ range 2° < θ < 70° were measured at room temperature (22°C). The…
Starting from a N-particle diffusion equation, the effective particle (self-) and concentration diffusion coefficients of interacting Brownian particles are studied theoretically. These two diffusion coefficients defined by distinct ways are different for interacting systems. By taking into account both potential and…
Abstract A general criterion for craze formation is presented. Crazes are deformation zones that are common to both glassy and semicrystalline polymers. Crazes are composed primarily of fibrils. This paper attempts to describe the process that transforms unoriented glassy and semicrystalline polymeric solids into a fi…
Abstract Mikrokristallines Cs 2 Te 5 entsteht aus stöchiometrischen Ansätzen der reinen Elemente in überkritischem Ammoniak. Cs 2 Te 5 kristallisiert orthorhombisch in der Raumgruppe Cmcm mit Z 4 und hat folgende Gitterkonstanten: a 9,37 9 Å, b 12,28 2 Å, c 10,12 8 Å. In der Struktur liegt ein eindimensional‐u…
New aspects of molecular interactions in corrosion inhibition are reported in this first investigation of benzotriazole on copper using surface enhanced Raman scattering (SERS). The observation of hysteresis in the Raman intensity of concentrated solutions as a function of applied voltage is attributed to a conformati…
Abstract The pressure‐volume‐temperature (PVT) properties of blends of poly(2,6‐dimethyl‐1,4‐phenylene ether) (PPO) with polystyrene (PS) have been studied experimentally in both the glassy and melt states at 0, 20, 40, 50, 60, 80, and 100% PPO content. In all compositions a strong glass transition was observed varyin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of copper and zinc on the growth of a freshwater alga, Scenedesmus quadricauda: the significance of chemical speciationRichard. PetersenCite this: Environ. Sci. Technol. 1982, 16, 8, 443–447Publication Date (Print):August 1, 1982Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic interactions in metal complexes of pentadentate binucleating ligands. 1. Synthesis and properties of binuclear copper(II) compounds containing single-atom-bridging ligands. Crystal and molecular structure of a binuclear .mu.-hydroxo-bridged copper(II) complex of 1,5…
Electron-irradiation induced amorphization of NiTi alloys has been investigated in a temperature range from 50 to 393 K by high voltage electron microscopy with the following results: A crystalline-amorphous transition occurs when the total dose of electrons reaches a certain value. The critical value decreases with d…
Abstract The lysis of phosphatidylcholine (PC) liposomes was sensitized to visible light (>500nm) by hematoporphyrin (HP) incorporated in the liposomes (0.09‐1.5%, wt/wt) or in the external buffer (1‐15 μM). The lytic mechanism changed from the Type II pathway mediated by singlet oxygen ( 1 O 2 ) at low HP concentr…
Summary Cardenolides (cardiac glycosides) are reported for the first time from wild‐collected material of Erysimum native to North America. For two seed samples of wild origin and for 24 leaf samples from greenhouse‐grown plants, total cardenolide content was determined by spectrophotometric assay in reactions with 2,…
Very precise electrical conductivity data on a series of six glasses (molar composition 25[xNa 2 O+(l−x)K 2 O]‐5Al 2 O 3 −70SiO 2 with 0.95 ≤x≤l) have been obtained over a large temperature range (∼310°C). Analysis of these data suggests that the preexponential term in the Arrhenius conductivity equation is temperatur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical study of o-quinone complexes of ironDouglas J. Gordon and Richard F. FenskeCite this: Inorg. Chem. 1982, 21, 8, 2916–2923Publication Date (Print):August 1, 1982Publication History Published online1 May 2002Published inissue 1 August 1982https://pubs.acs.org/doi/1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical characterization of a novel rhodium(II) dimer, Rh2(ONHCCF3)4Karl M. Kadish, D. Lancon, A. M. Dennis, and J. L. BearCite this: Inorg. Chem. 1982, 21, 8, 2987–2992Publication Date (Print):August 1, 1982Publication History Published online1 May 2002Published ini…