Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatic and dynamic single-crystal x-ray diffraction studies of some solid-state photodimerization reactionsHachiro Nakanishi, William Jones, John M. Thomas, Michael B. Hursthouse, and Majid MotevalliCite this: J. Phys. Chem. 1981, 85, 24, 3636–3642Publication Date (Print):No…
The dependences of brightness, emission efficiency η, average electric field EA, conduction current JA, and emission lifetime τ upon the device parameters such as film thickness, substrate temperature during evaporation, and Mn concentration have been systematically investigated in ZnS:Mn thin-film electroluminescent…
A general statistical–mechanical description of the liquid–glass transition as a transition from ergodic to non-ergodic behaviour is presented. The description is based on the concept of the different atomic configurations of a glass. The discontinuities of the thermodynamic derivatives of second order, which characte…
As examples of the best use of the so-called AC calorimetry technique, several results are described from various viewpoints. The behavior of heat capacity at ferroelectric, antiferroelectric and structural phase transitions is surveyed from the standpoint of critical behavior, of jump at first order transition, or of…
Magnetization curves are theoretically calculated for exchange-coupled ferrimagnetic double-layered (ECDL) films, each layer of which has a uniaxial anisotropy with the easy axis perpendicular to the film plane and exhibits a rectangular hysteresis loop. With this model are obtained the conditions for the appearance o…
Abstract The electrical resistivity of peroxide and radiation crosslinked polyethylene/carbon black compounds was studied as a function of black concentration and, temperature in heating/cooling cycles. Different carbon blacks in compounds with polyethylene responded differently, regarding electrical resistivity, to t…
Abstract The title reaction was studied in a stirred‐flow reactor at six temperatures ranging from 228 to 297 K and for pressures near 2 torr. The experiments were performed under O‐atom‐rich conditions, and the HOONO 2 concentration was monitored with a modulated molecular‐beam mass spectrometer. O‐atom concentration…
Abstract Calcium carbonate (CaCO 3 ) was precipitated by equilibrating samples of calcareous soil and noncalcareous soil with a dilute sodium bicarbonate solution at two soil‐to‐solution ratios. Different degrees of supersaturation of the soil solutions prior to precipitation were thus achieved by releasing variable a…
Abstract A poly(vinyl chloride) (PVC) plastisol is a suspension of fine particles of PVC dispersion resin in a plasticizer. The particle size ranges typically from about 15 to 0.2 µm and smaller. The PVC particles in the plastisol consist of the primary particles, which are products of polymerization, and of the agglo…
One of the effects of heavy doping is that the dielectric constant varies with impurity density, and thus with position. The general form of Poisson’s equation is solved numerically for a Gaussian p-n junction using a model for ε(N) which is consistent with the experimental data reported by Castner. The results indica…
After a review of previous work, the authors show their results obtained in the study of the effect of pressure on the magnetization mechanisms of polycrystalline soft ferrites up to 1.5 kbar and in a temperature range from 263°K to 573°K. Three kinds of pressures were applied : hydrostatic pressure, lateral pressure…
Magnetocrystalline anisotropy and magnetostriction were measured for the single crystals of Fe-Si-Al alloys lying near the Sendust composition (85%Fe, 9.6%Si, 5.4%Al). The constants K1, λ100, λ111and λsare plotted in the concentration diagram of the Fe-Si-Al system. It was found that K1= 0 is realized in the region of…
Abstract not Available.
Abstract The partial vapor pressures of Mg(g) over the spinel solid solution system, MgO·nAl2O3(n=1.0, 2.0, and 2.8), have been measured by the mass-spectrometric Knudsen-cell method. In the temperature range from 1850 to 2300 K, the pressures are described by these equations: log[P(Mg,g)over 1.0-spinel/atm]=7.72±0.24…
Untersuchungen an vier ferritisch‐perlitischen Stählen unterschiedlicher chemischer Zusammensetzung und Korngröße sowie einem bainitischen Stahl mit Streckgrenzenwerten zwischen 200 und 630 N/mm 2 . Ermittlung deroberen und unteren Streckgrenze im Temperaturbereich zwischen 77 und 370 K bei Dehngeschwindigkeiten zwisc…
Recent researches on high silicon iron alloys in our laboratory are presented. In the field of 6.5%Si-Fe alloy sheet, the substitution of 1.5% aluminum for silicon improves the cold workability and retains the good magnetic properties of 6.5%Si-Fe sheet. By a splat cooling technique, XSi.YAl.(100-X-Y). Fe ribbons (4.0…
By heat-treating in the ridge region of the miscibility gap, the magnetic properties of the Fe-Cr-Co permanent magnet alloys have been remarkably enhanced. The optimum procedure of the heat treatments, such as thermomagnetic treatment and step-aging sequence for the "ridge" alloys, is examined. Such heat treatments ar…
Fine-grained sediments are those rocks, both hard and soft, carbonate and clastic, that have a dominant grain-size in the clay or silt grades (<63 μm). They are the most abundant sediments on the earth's surface and form between 50 and 750f the geological column. Classifications of fine-grained sediments have been…
Abstract Tervalent cobalt complexes of octaethylporphyrin (OEP) and tetraphenylporphyrin (TPP), [CoIII(OEP)(H2O)2]X (X=ClO4, BF4), [CoIII(OEP)(THF)2]ClO4, [CoIII(TPP)(H2O)2]X (X=ClO4), and [CoIII(TPP)(H2O)Y] (Y=Cl, Br, SCN, N3) were synthesized. Molecular weight measurements indicate that only [CoIII(TPP)(H2O)2]BF4 an…
Abstract The radiation crosslinking of poly(vinyl chloride), PVC, with trimethylolpropane trimethacrylate, TMPTMA, has been examined. The polyfunctional TMPTMA undergoes rapid polymerization incorporating the PVC into a three‐dimensional network. The kinetics and mechanism of these crosslinking reactions were studied…