Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemically induced charge separation at the molecular level. A chromophore-quencher complex containing both an electron donor and an acceptorEarl Danielson, C. Michael Elliott, Jon W. Merkert, and Thomas J. MeyerCite this: J. Am. Chem. Soc. 1987, 109, 8, 2519–2520Public…
The function f B A -which defines the degree by which an A atom is surrounded by neighbours of B atoms in Miedema's semi-empirical model and is used for the calculation of the formation enthalpy of crystalline alloys-is modified for amorphous alloys. For the five alloy systems considered, the f B A function turns out…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal disorder and triboluminescence: triethylammonium tetrakis(dibenzoylmethanato)europateLinda M. Sweeting and Arnold L. RheingoldCite this: J. Am. Chem. Soc. 1987, 109, 9, 2652–2658Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Publi…
The occurrence of smectic order in a system of perfectly aligned hard cylinders is studied with use of a bifurcation analysis of the free-energy functional in the second virial coefficient approximation. This approximation is shown to yield a second-order transition of mean-field type towards a smectic phase. The infl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular design and model experiments of ferromagnetic intermolecular interaction in the assembly of high-spin organic molecules. Generation and characterization of the spin states of isomeric bis(phenylmethylenyl)[2.2]paracyclophanesAkira Izuoka, Shigeru Murata, Tadashi Su…
The study of the magnetic properties of heteronuclear species has shown that ferromagnetic coupling is much more common than it was suspected before, because by using different metal ions, or in general different spins, it is much easier to bring into interaction orthogonal magnetic orbitals. These results have been v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic and theoretical studies of the unusual EPR parameters of distorted tetrahedral cupric sites: correlations to x-ray spectral features of core levelsAndrew A. Gewirth, Susan L. Cohen, Harvey J. Schugar, and Edward I. SolomonCite this: Inorg. Chem. 1987, 26, 7, 11…
High-sensitivity measurements of the magnetostriction constant ${\ensuremath{\lambda}}_{s}$ have been performed in the nearly zero magnetostriction (${\mathrm{Co}}_{0.94}$${\mathrm{Fe}}_{0.06}$${)}_{75}$${\mathrm{Si}}_{15}$${\mathrm{B}}_{10}$ metallic glass as a function of the stress and temperature after pulse-annea…
From the University of Utah, College of Engineering, Salt Lake City, Utah; Toray Industries, Inc., Basic Research Labs, Kamakura, Japan; Department of Chemical Engineering, University of Wisconsin, Madison, Wisconsin; and the University of Utah, Department of Pharmaceuctics, Salt Lake City, Utah.
A complete microelectrochemical transistor on a single chip based on the reversible, solid state oxidation of poly(3-methylthiophene) is reported. An array of eight, individually addressable, microelectrodes each approx. 2 micrometer wide X approx. 50 micrometer long X 0.1 micrometer high and separated from each other…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of the absorption and magnetic circular dichroism spectra of zinc phthalocyanine and the .pi.-cation-radical species [ZnPc(1-)].cntdot.+Tebello Nyokong, Zbigniew Gasyna, and Martin J. StillmanCite this: Inorg. Chem. 1987, 26, 7, 1087–1095Publication Date (Print):Apr…
High‐temperature electrical conductivity, Seebeck coefficient, and thermal conductivity measurements were used to study the effects of different cation substituents on electrical and thermal transport in YCrO 3 and LaCrO 3 . The substitution of divalent Ca and Sr for Y and La, respectively, resulted in the formation o…
Abstract Well-crystallized perovskite-type oxides could be synthesized at temperatures as low as 550–650 °C by the calcination of amorphous citrate complex precursors. The large specific surface areas of the oxides obtained suggest that the citrate process is very promising for preparing perovskite-type oxide catalyst…
Abstract The continuous conversion of smectite to illite in samples from the Shinzan hydrothermal alteration area of Japan has been examined by X-ray powder diffraction (XRD) and transmission (TEM) and analytical transmission electron microscopy (AEM). TEM shows that randomly interstratified illite/ smectite (I/S) con…
The Morin temperature (${T}_{M}^{0}$) of annealed, monodispersed, nearly spherical particles having diameters (d) between (0.07--0.62) \ensuremath{\mu}m have been investigated. A plot of ${T}_{M}^{0}$ versus 1/d is linear. The extrapolation of this plot between 230 and 262 K to d=\ensuremath{\infty} gives ${T}_{M}^{0}…
A new ATP-dependent, casein-degrading proteolytic complex has been identified and partially purified from Escherichia coli. The proteolytic complex can be isolated from wild-type cells as well as from mutants in which the gene for the ATP-dependent Lon protease is deleted. The complex consists of at least two componen…
We consider ferroelectric compounds created by relative ionic displacements between two or more sublattices (``displacive'' phase transitions). For these ferroelectric materials the nonbonding p orbitals of oxygen ${(0}^{2\mathrm{\ensuremath{-}}}$) or chalcogen (${\mathrm{S}}^{2\mathrm{\ensuremath{-}}}$, etc.) ions pl…
The complex dielectric constant has been measured in a room-temperature ferroelectric liquid-crystal mixture. We have resolved the experimental data into the Goldstone mode and the soft mode and for each mode determined the dielectric strength and the corresponding relaxation frequency. The results are compared with t…
Anomalously large current plateaus observed in the cyclic voltammograms of some conducting polymers such as polypyrrole have been recently interpreted as the charging of a large capacitance taking place in the polymer in the oxidized state. The nature and the origin of such capacitance is actually discussed either in…
A fracture mechanics model is developed for nontransforming ceramics that show an increasing toughness with crack extension ( R ‐curve, or T ‐curve, behavior). The model derives from the observations in Part I, treating the increased crack resistance as the cumulative effect of grain bridging restraints operating behi…