Materials Literature
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Reaction‐bonded Si 3 N 4 · TiN and Si 3 N 4 · Al 2 O 3 composites were successfully fabricated by heating mixed powder compacts of Si and TiN or Si and Al 2 O 3 in a nitrogen atmosphere. The former showed electrical conductivity, owing to the presence of TiN. An electrical resistivity of 2.6 × 10 −5 Ω· m was obtained…
Abstract Durch Symproportionierung von elementarem Selen und Selentetrabromid in polaren protischen Lösungsmitteln wurde eine neue Klasse tri‐, tetra‐ und pentanuklearer Bromoselenate(II) dargestellt. In 2‐Methylpropionitril als Lösungsmittel wurde das strukturell neuartige Ion [Se 3 Br 8 ] 2− stabilisiert und als sch…
The BEATRIX-II experiment in FFTF is an in-situ tritium recovery experiment to evaluate the tritium release characteristics of Li2O and its stability under fast neutron irradiation to extended burnups. This experiment includes two specimens: a thin annular ring specimen capable of temperature transients and a solid te…
Silicon aluminium oxynitride (β′ sialon) powders have been prepared by reacting kaolin–carbon mixtures at 1400–1500°C in flowing nitrogen. The kaolin/carbon ratio in the starting mixtures must be accurately controlled to obtain single phase β′ powders. The overall reaction rate increased with increasing nitrogen flowr…
Abstract Mit Hilfe von Mott‐Schottky‐Analysen und photoelektrochemischen Untersuchungen wurden die Halbleitereigenschaften von Passivfilmen auf AISI 304 charakterisiert und mit dem Auftreten von Stromtransienten, welche aus metastabilen Lochkorrosionsvorgängen resultieren, verglichen. Es zeigte sich, daß das Potential…
Abstract When the coupling agent is dissolved homogeneously in water, the hydrolysis rate of the alkoxy group is influenced by the pH of the solution, the size of the alkoxy group, and to a lesser extent, the size of the organofunctional group directly attached to the silane atom. We have quantitatively studied the re…
A mechanism is proposed for the radiolysis which occurs in soda‐silicate glasses when they are irradiated. The mechanism is consistent with the observations of the reaction products which are produced and the rates at which the decomposition proceeds.
Abstract Aluminous lateritic soils from Governor's Harbour, Eleuthera, Bahamas are described. These soils are forming on eolian ridges under a humid, tropical savanna climate. The parent material is carbonate eolianite plus airborne dust from North Africa. The soils are thin, discontinuous and concentrated in shallow…
We present in this paper a comprehensive study of the static and dynamic properties of point defects and of their interaction with dislocations and grain boundaries. First, by using short-range pair potentials fitted to physical parameters of Mg and Zr, we calculate defect configurations and associated energies. Two d…
The fractions of absorbed, backscattered, and transmitted electrons bombarding a thin solid film are calculated as functions of the film thickness both in the absence and in the presence of a substrate. The depth distribution of the absorbed electrons has also been calculated.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConductive polymeric porphyrin films: application in the electrocatalytic oxidation of hydrazineJ. E. Bennett and T. MalinskiCite this: Chem. Mater. 1991, 3, 3, 490–495Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetection of branching on poly(vinyl fluoride) by NMR and the effect of synthesis conditions on polymer structureDerick W. Ovenall and Ronald E. UscholdCite this: Macromolecules 1991, 24, 11, 3235–3237Publication Date (Print):May 1, 1991Publication History Published online1…
Microlens effects have been obtained in homogeneously aligned liquid crystal cells prepared using a hole-patterned electrode and a plane electrode. In the asymmetric electrode structure, an axially symmetric non-uniform electric field is produced and a radial distribution of refractive indices can be obtained by the m…
We present a method to calibrate the profile of Al mole fraction versus depth, deposited in growth of graded AlxGa1−xAs alloys in a molecular-beam epitaxy machine. A computer is used to either ramp the Al oven temperature (analog alloy), or pulse the Al beam (digital alloy), with a fractional monolayer depth resolutio…
Magnetic hysteresis is found at the first-order spin-flop transition in ${\mathrm{K}}_{2}$Fe(${\mathrm{Cl}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Br}}_{\mathit{x}}$${)}_{5}$\ensuremath{\cdot}${\mathrm{H}}_{2}$O (x=0.1, 0.2, and 0.3). From measurements of the ac susceptibility \ensuremath{\chi} and from a stud…
The purified compound, 4', 5, 6, 7-tetramethoxyflavone, is an active ingredient isolated from Eupatorium odoratum, a Thai indigenous plant that has long been used to stop bleeding. This compound was studied in vitro for the effect on blood clotting factor activities. It was found that the compound enhanced blood coagu…
Chemically vapor deposited (CVD) diamond films have been deposited on quartz substrates using a configuration in which the substrate is placed parallel to the direction of the gas flow in the deposition system. Spatially resolved Raman spectroscopy and optical microscopy of the resultant films revealed that (a) as the…
Abstract With the addition of 20 phr of BR granulate grafted with ethyl acrylate by the redox or gamma irradiation method to polyacrylic rubber compound, the properties of the rubber worsened, but remained within the range of properties characteristic for these types of rubber. The stability of rubber against swelling…
Abstract Iron(III) complexes of [FeL]BPh4·acetone containing the hexadentate ligand derived from triethylenetetramine and salicylaldehyde have been synthesized. These complexes were grown in two crystalline forms, monoclinic and the twin crystals. The crystal structure of the monoclinic form was determined at 290 K, a…
The role of scattering of the incident excitation electrons is examined by use of judiciously chosen scattering geometries that allow for the experimental separation of incident-beam effects and Auger-electron-scattering effects. The scattering of 4-keV incident electrons can result in variations greater than 25% of t…