Materials Literature
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A simplified method is presented to measure the grounding resistance of adjacent electrodes which can be of use in other situations, when ground electrodes are composed of many elements or when an existing electrode is extended. The opportunity of remeasuring electrode potential curves showed that local gradients can…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Cu6O15 "bowls" in seven new barium copper oxides: metal barium copper oxide (M6Ba46Cu24O84) (M = aluminum, silicon, titanium, iron, gallium, germanium, zirconium)Paul D. VerNooy, Michael A. Dixon, Frederick J. Hollander, and Angelica M. StacyCite this: Inorg. Chem. 199…
The fracture strength of an α‐ and β‐SiAION was measured by biaxial and four‐point bending. By utilizing Weibull statistics a close prediction could be made of the four‐point values from the biaxial values. At a fracture strength of 460 MPa, fracture was initiated by linking of surface and subsurface flaws.
The screened hopping mechanism, which assumes that in every dielectric system, dipolar or hopping-charge-dominated, there must be a finite amount of local adjustment of dipolar orientations or of charge dispositions in response to any particular dipole or charge movement, is discussed. The relaxation of polarization i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModeling diffusion and reaction in crosslinking epoxy-amine cure kinetics: a dynamic percolation approachDonald F. Rohr and Michael T. KleinCite this: Ind. Eng. Chem. Res. 1990, 29, 7, 1210–1218Publication Date (Print):July 1, 1990Publication History Published online1 May 20…
The paper describes the method and discusses the results of microwave and millimetre wave dielectric spectroscopy of the extremely low-frequency soft overdamped modes in some highly anisotropic semiconductive ferroelectrics, and relaxational soft modes in quasi-one-dimensional hydrogen-bonded ferroelectrics.
Abstract The caesiation of a clean Te metal film during the formation process of a Cs 2 Te photocathode has been studied by X‐ray photoelectron and Auger electron spectroscopies. Cs 2 Te is essentially an ionic compound that is stable with a large Cs excess. The ionicity increases with Cs content up to the stoichiomet…
Abstract The formation of passive films as a function of time and potential on Fe53Ni in 1 M NaOH in 0.005 M H 2 SO 4 + 0.495 M K 2 SO 4 and on Fe10Ni in 1 M NaOH was studied by XPS. In order to avoid air oxidation and to minimize contamination of the samples, an electrochemical specimen preparation and transsfer syst…
The effect of sintering atmosphere on the final density and electrical properties of alumina compacts has been investigated using two different oxygen pressures: air and CO/CO 2 . Measuring of electrical behavior has been considered a tool for determining the mechanism responsible for densification. Finally, the impor…
The mechanism of material removal from SiC by CO 2 laser heating was studied using sintered and single‐crystal α‐SiC. Removal rate and width of the groove showed maxima when plotted as a function of translation speeds. Groove depth decreased as the translation speed of samples increased. Similar results were obtained…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear Overhauser effect in solidsJeffery L. White and James F. HawCite this: J. Am. Chem. Soc. 1990, 112, 15, 5896–5898Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue 1 July 1990https://pubs.acs.org/doi/10.1021/ja00171a0…
Abstract A kinetic model of the homogeneous anionic polymerization of 1,4‐divinylbenzene (1,4‐DVB) in dilute solutions with instantaneous initiation and without cyclization and termination reactions is proposed. The monomer and pendant vinyl group conversions, degrees of polymerization of the primary chains and the cr…
Abstract Poly[2,2'‐(m‐phenylene)‐5,5'‐bibenzimidazole] (PBI) is shown to be miscible with poly(4‐vinyl pyridine) over the entire composition range. Experiments were performed with commercial PBI as well as a lower molecular weight material synthesized by us. Blend miscibility is evidenced by single glass transition te…
A sample of (U,Pu)-mixed oxide was fission heated along the saturation line and into the compressed liquid regime. The density of the sample at temperatures around 7000 K was determined from the onset of the liquid-phase pressure signal. Values for the compressibility of the (U,Pu)-mixed oxide were determined from the…
Abstract Surface analytical and optoelectrochemical measurements were used to clarify the ionic, spectral and electronic changes during oxidation in 3 N NClO 4 of electrochemically formed polycarbezole. The differences in band structure at various potentials could be shown using XPS and UPS measurements. Apart from a…
Existing capabilities to quantitatively model carbide precipitation and sensitization development in austenitic stainless steels are assessed and critically analyzed. A theoretically based, empirically modified model is described that predicts carbide nucleation kinetics, chromium depletion characteristics, and materi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoresponsive ionic conductivity of polymer composite films containing azobenzene liquid crystalKeiichi. Kimura, Tatsuya. Suzuki, and Masaaki. YokoyamaCite this: J. Phys. Chem. 1990, 94, 15, 6090–6093Publication Date (Print):July 1, 1990Publication History Published online…
Optical and dielectric studies of sodium niobate crystals have been carried out in an extended electric field (up to 2.2·108 V/m) at temperatures from 8 0 K to 530 K. It has been found that apart from the known ferroelectric Palma phase, a ferroelectric phase of tetragonal symmetry is induced in NaNbO3 crystals by a s…
A major deficiency of current photon calculation methods that are based on the concept of primary and scatter separation is their inability to handle the condition of electronic disequilibrium. This deficiency is examined and it is shown that the limitation is not inherent in the algorithms themselves but is, at least…
Abstract 2 H and 13 C NMR techniques were used to investigate the thermodynamic state of water molecules and of poly(vinyl alcohol) (PVA) chain segments in frozen 10% PVA solutions in 99.8% and 8.5% 2 H 2 O in the ‐66 to 3°C temperature range. The minimum amount of water not entering into the structure of ice is shown…