Materials Literature
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Grain boundary engineering is based on the fact that special grain boundaries (i.e. low Σ CSL) may have beneficial physical and chemical properties. It is now possible to increase and characterize the fraction of low Σ interfaces in polycrystalline materials, thereby improving their bulk properties by controlling the…
Results of optical-absorption experiments on heavily irradiated NaCl single crystals are presented. The dose rates were between 4 and 250 Mrad/h; the doses between 1 and 7 Grad. The irradiation temperatures were in the range of 20--150 \ifmmode^\circ\else\textdegree\fi{}C. Because of the intense optical bands, the thi…
We argue that the possibility to observe a stable biaxial nematic phase in a binary \nmixture of prolate and oblate hard particles is seriously limited by the existence of entropydriven \ndemixing. This result follows from a simple Onsager-type density functional theory. An \nimportant feature15 the coupli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of Bromide Oxidation by (Oxalato)oxodiperoxomolybdate(VI)Martha S. Reynolds, Steven J. Morandi, James W. Raebiger, Sean P. Melican, and Sean P. E. SmithCite this: Inorg. Chem. 1994, 33, 22, 4977–4984Publication Date (Print):October 1, 1994Publication History Publish…
The evolving realm of inorganic chemistry. Part 1 Co-ordination chemistry: an introduction to co-ordination chemistry structures of co-ordination compounds bonding theories for co-ordination compounds rates and mechanisms of reactions of co-ordination compounds applications of co-ordination compounds. Part 2 Solid-sta…
A new type of grafted polysiloxane polymer is described in which an aryldiamine\nsubstituent, [CsH3(CHzNMe2)2-2,61-, provides a pendant terdentate ligand environment for\na catalytically active (0rgano)nickel center. The novel strategy employed involves initial\ngrafting of the aryl bromide 5-amino-2-bromo-1,3-bis[(di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Preparation of Organosilicon .mu.-Spheres: A Polycondensation in .mu.-Emulsion?Frank Baumann, Manfred Schmidt, Bernward Deubzer, Michael Geck, and Jochen DauthCite this: Macromolecules 1994, 27, 21, 6102–6105Publication Date (Print):October 1, 1994Publication History…
The dielectric properties of (Pb 1– x X x ) (Zr 0.7 Ti 0.3 )O 3 (X = Ca, Sr, Ba) ceramics (abbreviated PXZT) were investigated for applications to multilayer ceramic capacitors (MLCs) with dielectric layers thinner than 10 μm. The dissipation factors for MLCs with 5‐μm‐thick dielectric layers were estimated from those…
We have coupled electron paramagnetic resonance (EPR) and polarization–voltage measurements to understand the effects of reducing ambients on the remanent polarization and density of paramagnetic centers in BaTiO 3 , single crystals. Two types of reducing ambients were explored; one was done under vacuum (slightly red…
The copper(II) complex of the N4S2 encapsulating ligand 1-methyl-8-ammonio-3,13-dithia-6,10,16,19-tetraazabicyclo-[6.6.6]icosane, [Cu(AMN(4)S(2)sarH)](3+), is reported. Crystals of the complex are monoclinic, of space group P2(1)/a (Z = 4, a = 16.463(3) Angstrom, b = 11.073(3) Angstrom, c = 17.138(3) Angstrom, beta =…
The effects of compressive deformation on the grain boundary characteristics of fine‐grained Y‐TZP have been investigated using surface spectroscopy, impedance analysis, and transmission electron microscopy. After sintering at low temperature (1150°C), the grain boundaries are covered by an ultrathin (1nm) yttrium‐ric…
<div class="htmlview paragraph">Smoke emission from single-cylinder DI and IDI diesel engines was shown to strongly depend on oxygen content in fuel regardless of oxygenate molecular structure. Thus, with cetane improver and oxygenate used in combination in a proportion determined from blending properties and po…
A simulated annealing method for atomic resolution structure prediction of alpha-helical coiled coil proteins is described which draws upon knowledge of the oligomerization state, the helix directionality, and the properties of heptad repeat sequences. Unknown structural parameters, such as the coiled coil twist angle…
We consider both the spatial domain and spectral domain forms of the Green's function, appropriate in the electromagnetic diffraction of a plane wave incident at a general angle in the xy plane on a singly periodic structure, or grating, oriented along the x axis. We equate the spatial and spectral forms of the Green'…
A unifying, quantitative analytical framework has been developed for rhombohedral perovskite structures, ABO 3 . Three principal parameters are defined: polyhedral volume ratio, V A /V B , mean octahedral tilt angle, , and octahedral distortion, Δs. The first two of these parameters are directly related through the eq…
Although stable under hydrostatic pressures up to 20 GPa, ${\mathrm{C}}_{60}$ molecules transform to a transparent and insulating material if compressed nonhydrostatically at room temperature. On the other hand, quasihydrostatic loading at higher temperatures yields black, electrically conducting samples. We report he…
Abstract Hectorite and saponite are exchanged with [Al 13 O 4 (OH) 24 (H 2 O) 12 ] 7+ and the amount of Al 3+ adsorbed and Na + released are followed as a function of the exchange conditions. On saponite the reaction is a pure ion exchange with 2–2.15 mmol Al 3+ /g adsorbed and release of 0.80 mmol Na + /g. On hectori…
Unsymmetrically substituted (phthalocyaninato)nickel(II) complexes –7 were synthesized by statistical condensation of 4,5‐dipentoxy‐ ( 2a ), 4,5‐diheptyl‐ ( 2b ), 3,6‐dihexoxy‐ ( 2c ), and 3,6‐diheptylphthalonitrile ( 2d ) with 3,4,5,6‐tetraphenylphthalonitrile ( 1 ) and separated by column chromatography. The obtaine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination Patterns for Biliverdin-Type Ligands. Helical and Linked Helical Units in Four-Coordinate Cobalt and Five-Coordinate Manganese(III) Complexes of OctaethylbilindioneAlan L. Balch, Marinella Mazzanti, Bruce C. Noll, and Marilyn M. OlmsteadCite this: J. Am. Chem. S…
Cyclotrimerization of 4,5‐bis(hexylthio)phthalodinitrile ( 1 ) in 1‐chloronaphthalene in the presence of BCl 3 leads to the subphthalocyanine 4 . Unsymmetrical phthalocyanines ( 5, 6 ) with six alkylthio substituents on three of the benzenoid units are synthesized by the reaction of 4 with an diiminoisoindoline deriva…