Materials Literature
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Through TEM observations it was established that particles of the positive active mass are heterogeneous in mass distribution. Using electron micro‐micro‐diffraction it was found that particles are built up of zones of crystal structure with various orientation, and of amorphous zones. The latter are more transparent…
The fundamental corrosion behavior of silicon carbide (SiC) ceramics was investigated after immersion in 290°C water solutions with different pH and dissolved‐oxygen concentrations. The weight loss in the oxygenated solution was more than that in the deoxygenated solution and was accelerated by increasing pH. Preferen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative studies of the photophysical properties of copper phenanthrolines: from Cu(dmp)2+ to the copper(I) catenatesAnn K. I. Gushurst, David R. McMillin, Christiane O. Dietrich-Buchecker, and Jean Pierre SauvageCite this: Inorg. Chem. 1989, 28, 22, 4070–4072Publication…
The microstructures of three ZnO varistor materials with different Bi2O3 contents have been evaluated by analytical electron microscopy in combination with x-ray diffractometry. The results have been correlated to microelectrode measurements, where breakdown voltages of individual ZnO junctions were measured, and also…
A new set of models for the stress effects in silicon oxidation is proposed. The most essential feature is the nonlinear shear-stress-dependent oxide viscosity which models a high-stress relaxation phenomenon similar to plastic deformation. The models are shown to agree well with the most comprehensive and quantitativ…
SUMMARY We show that the number of atoms in a small supported catalyst cluster can be estimated from the strength of electron scattering into a high angle annular detector in the STEM. The technique is related to the Z contrast methods developed by Crewe, Wall, Langmore and Isaacson. It works best for high atomic numb…
Dilute suspensions of micron diameter dielectric spheres confined to two dimensions are induced to aggregate linearly by application of an electric field. The growth of the average cluster size agrees well with the Smoluchowski equation, but the evolution of the measured cluster size distribution exhibits significant…
Two tricritical points, where a phase transition changes from first to second order, were found to occur in the lead zirconate-titanate (PZT) solid solution system. High-temperature x-ray diffraction data on sol-gel derived PZT powders were used to calculate the cell parameters and spontaneous strain in the ferroelect…
Magnetization measurements are reported for ${\mathrm{Fe}}_{3(1\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}})}$${\mathrm{O}}_{4}$ in the range 0\ensuremath{\le}\ensuremath{\delta}<0.010. Anisotropy parameters consistent with these measurements were determined as a function of \ensuremath{\delta} and of temper…
It has been widely observed in ionic donor-acceptor charge-transfer (CT) compounds that kink-type domain walls between one-dimensional ferroelectric molecular domains show strong dielectric response with a thermally activated relaxation frequency over a wide temperature range. The domain walls can carry spin and elect…
ABSTRACT Various formulations and methods of fabricating a film consisting of edible hydrocolloids and lipids were investigated. Two formulations consisting of a methylcellulose base layer and a beeswax layer, deposited either from a molten state (Wax‐M film) or from an ethanolic solution (Wax‐S film), were examined f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAryl-bridged polysilsesquioxanes--new microporous materialsKenneth J. Shea, Douglas A. Loy, and Owen W. WebsterCite this: Chem. Mater. 1989, 1, 6, 572–574Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 November 1989h…
The qualitative predictions of the mode–mode-coupling (MMC) theory developed in the preceding paper are determined for various transport properties and time correlation functions. The degree of polymerization N dependence of the self-diffusion constant D of long flexible chain and rigid rod melts are found to be in ag…
Inelastic-neutron-scattering studies of glassy, liquid, and polycrystalline selenium have been performed at temperatures between 100 and 600 K. A self-consistent data evaluation, taking careful account of multiple and multiphonon scattering, shows that a complete interpretation is possible in terms of a temperature-de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical and magnetic properties of liquid crystalline molecular materials: lithium and lutetium phthalocyanine derivativesZ. Belarbi, C. Sirlin, J. Simon, and Jean Jacques AndreCite this: J. Phys. Chem. 1989, 93, 24, 8105–8110Publication Date (Print):November 1, 1989Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBlock copolymer self-assembly in selective solvents: theory of solubilization in spherical micellesR. Nagarajan and K. GaneshCite this: Macromolecules 1989, 22, 11, 4312–4325Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inis…
A new direct imaging photoelectron microscope has been demonstrated at the Stanford Synchrotron Radiation Laboratory. Data are obtained in the form of spectrally resolved images with a lateral resolution of &lt;5 μ. The microscope produces a series of projected images with 64×64 picture elements. These images are…
This paper describes the use of electrically conducting polyanilines as discharge layers for electron-beam (e-beam) lithography. The emeraldine oxidation state polyaniline is a soluble material which can be doped by various cationic reagents, most commonly protonic acids, to afford conductivity on the order of 10° Ω−1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFTIR studies of polyimides: thermal curingR. W. Snyder, B. Thomson, B. Bartges, D. Czerniawski, and P. C. PainterCite this: Macromolecules 1989, 22, 11, 4166–4172Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 Novemb…
Focusing on all aspects of composites, this book covers the composition, structure, and physical properties of composites. You'll study the manufacturing methods of fiber reinforced plastics and post fabrication techniques, as well as the latest composites applications. Topics include: thermosets, thermoplastics, non-…