Materials Literature
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Isothermal growth of β‐Si 3 N 4 crystals dispersed in an oxynitride glass (Y‐Si‐Al‐O‐N) was studied by electron microscopy after heat treatment at temperatures between 1550° and 1640°C for 1 to 18 h. The β‐crystals exhibited growth striations introduced by intermediate coolings and these striations were used for devel…
Diffusionless tetragonal ( t′ ) cubic ( c′ ) phase transformation in 65‐mol%‐CeO 2 ‐ZrO 2 was investigated around the c′‐t′ equilibrium temperature T 0 c′‐t′ using powder X‐ray diffraction, where c′ was defined as a tetragonal or cubic phase with an axial ratio of unity. The {400} peak profile of t′ ‐ZrO 2 broadened…
In order to demonstrate experimentally that the competition between the antiferroelectric and ferroelectric interactions stabilizing Sm${\mathit{C}}_{\mathit{A}}^{\mathrm{*}}$ and Sm${\mathit{C}}^{\mathrm{*}}$ (the pairing energy of the transverse dipole moments in adjacent smectic layers and the packing entropy resul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxalate-bridged dinuclear chromium(III)-M(II) (M = copper, nickel, cobalt, iron, manganese) complexes: synthesis, structure, and magnetismMasaaki Ohba, Hiroko Tamaki, Naohide Matsumoto, and Hisashi OkawaCite this: Inorg. Chem. 1993, 32, 23, 5385–5390Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition metal derivatives of a chelating nitronyl nitroxide ligand. Nickel(II) and manganese(II) complexesDominique Luneau, Gerard Risoan, Paul Rey, Andre Grand, Andrea Caneschi, Dante Gatteschi, and Jean LaugierCite this: Inorg. Chem. 1993, 32, 24, 5616–5622Publication D…
New crown‐ether‐functionalized alkyl(oligothiophene)s (see Figure) have been synthesized and electropolymerized to alkali metal ion sensitive poly(alkylthiophene)s. It is shown for the first time that the redox chemistry of a conducting polymer is strongly influenced by the specific host‐guest interaction, although th…
The growth of diamond in a subatmospheric dc-arc plasma-jet reactor has been studied theoretically. Full transport equations for this geometry, including gas-phase and surface chemistry, have been solved numerically. The surface-reaction mechanism includes pathways for the incorporation of CH3, C2H2, and C from the ga…
A simple Hertzian contact procedure for investigating cyclic fatigue damage in brittle polycrystalline ceramics is described. Repeat loading of a spherical indenter on a coarse alumina ceramic produces cumulative mechanical damage. The mode of damage is one of deformation-induced intergranular microfracture, leading u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution and solid-state properties of hybrid linear-dendritic block copolymersIvan Gitsov and Jean M. J. FrechetCite this: Macromolecules 1993, 26, 24, 6536–6546Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 Novemb…
Sequences of 16 NAD and/or NADP-linked aldehyde oxidoreductases are aligned, including representative examples of all aldehyde dehydrogenase forms with wide substrate preferences as well as additional types with distinct specificities for certain metabolic aldehyde intermediates, particularly semialdehydes, yielding p…
This manuscript reviews an approach for improved design and lifetime evaluation for environmental cracking based on fundamental modeling of the underlying, operative processes in crack advance. In outlining this approach and its application in energy industries, the requirements for a life prediction methodology will…
Abstract Various dinuclear copper(II) compounds bridged by the oxalato, oxamato, and oxamidato ligands were prepared and characterized by means of magnetic susceptibility and IR spectroscopy. The strong antiferromagnetic couplings through their carboxylate or carboxamidate groups are interpreted in terms of the ligand…
Dilute aqueous solutions of two surface active agents (surfactants) were tested for their ability to suppress spontaneous steam explosions in molten tin/water systems. At 800° C, 12 g of tin were dropped into aqueous solutions of a nonionic surfactant (nonylphenol polyethylene glycol ether) and an ionic surfactant (do…
Isothermal fatigue and in‐phase thermomechanical fatigue (TMF) tests were performed on a unidirectional, continuous‐fiber, Nicalon®‐reinforced calcium aluminosilicate glass‐ceramic composite ([O] 16, SiC/CAS‐II). Monotonic tensile tests were performed at 1100°C (2012°F) and 100 MPa/s (14.5 ksi/s) to determine the mate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethylhydridopolysilazane and its pyrolytic conversion to silicon nitride-silicon carbide (Si3N4/SiC) ceramicsNeal R. Dando, Anthony J. Perrotta, Carsten Strohmann, Regina M. Stewart, and Dietmar SeyferthCite this: Chem. Mater. 1993, 5, 11, 1624–1630Publication Date (Print):…
Numerical micromagnetic calculations of the nucleation field of two-dimensional magnetic microstructures reveal the effects of interparticle interactions on the magnetization reversal mechanism. The results show that the magnetic behavior of interacting particles drastically changes with the grain size. For an average…
Yarn pullout behavior from a woven fabric is an important indicator of the mech anism of yarn interactions within the fabric and a predictor of its various mechanical properties. It is investigated in this paper both theoretically and experimentally. An analytical model developed for nonwoven structures is modified he…
Ga-doped Nd-Fe-B sintered magnets show an improved wetting behavior of the liquid phase during sintering and the formation of additional Ga-containing intergranular phases. Nb forms precipitates within the hard magnetic grains and enhances the coercivity. In the as-sintered magnets, a new Nd-rich Ga-containing region…
The complex dielectric permittivity and the complex magnetic permeability of the orthoferrites RFeO/sub 3/ (R=Y, Tm, Dy, Gd, Ho, Er, Tb) and Y/sub 1-x/Lu/sub x/FeO/sub 3/ have been investigated at submillimeter wavelengths v=100-1000 GHz. The parameters of the two antiferromagnetic resonance modes (resonance frequenci…
CeO(x)F(y) films were made by reactive rf magnetron sputtering of Ce in Ar + O(2) + CF(4). Stoichiometries between CeO(2) and CeO(1.0)F(1.3) were obtained when the CF(4) content lay between 0% and 9%. For wavelengths λ of > 0.4 µm, the films were almost nonabsorbing, and the refractive index at λ = 0.55 µm went from 2…