Materials Literature
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The Insulated Conductors Committee of the Power Engineering Society at a recent meeting recognizes Al Gilbert and Frank Precopio, the two inventors of chemically crosslinked polyethylene. Because of the historic significance for insulation technology, the remarks made by these two inventors are reproduced in this maga…
The amazing oxygen exchange properties within the Ce2Sn2O7–Ce2Sn2O8 pyrochlore solid solution were investigated by means of in situ neutron diffraction experiments. The structural modification of the Ce2Sn2O7 phase heated under oxygen up to 1000 °C was followed on the basis of the neutron diffraction patterns, continu…
Lattice energy minimization techniques have been used to study the 2D molecular organization of [Ru(bpy)3]2+ and [Ru(phen)3]2+ confined in the interlamellar space of low charged smectites with respect to the stereochemistry of the pillars and the charge distribution within the host. The simulation results underline th…
Electrical contacts to porous silicon (PS) were formed by depositing aluminum onto its surface. The corresponding Al/PS/Si structures show a rectifying behavior, even after prolonged times in contact to the atmosphere. The series resistance and the ideality factor as a function of time of storage in ambient air have b…
Uncoupling of the dynamic equation for cyclic periodic structures and U-transformation analytical solutions for cyclic periodic structures linear periodic structures - discrete systems linear periodic structures - continuous systems structures with periodicity in two directions exact solution of the finite element equ…
The synthesis and magnetic behaviour of poly[6-(N-oxyl-N-tert-butylamino)biphenyl-3,3′-ylene] 2 are described. Polyradical 2 was prepared by the Pd-catalyzed polycondensation of N-tert-butyl-2,4-dibromoaniline and 1,3-phenylenebis(trimethylene boronate), followed by oxidation with 3-chloroperoxybenzoic acid. The degre…
This paper identifies corona and local arcing as the major ageing influences on silicone rubber surfaces. The hydrophobic properties of silicone rubber lead to the formation of discrete water droplets on the surface and these can lead to local enhancement of the electric field and corona activity. This activity leads…
1,4-Diisobutylene-2,3,5,6-tetraxydroxy-1,4-diphosphine oxide (Cyagard) provides good fire retardant performance for poly(butylene terephthalate) (PBT) as measured by the UL94 test whereas the combination of Cyagard with some co-additives helps to increase the limiting oxygen index (LOI). A correlation between the soli…
The glass‐melt penetration of dense TiO 2 polycrystals (where the grains are initially in contact) and the sintering of SiO 2 ‐coated TiO 2 powders (where the grains are initially separated) have been used to investigate the influence of initial particle separation on final microstructures. Grains that were initially…
The electrochemical behavior of a series of undecatungstozincates monosubstituted by first-row transition metals, ZnW11M(H2O)O39n– (M = Cr, Mn, Fe, Co, Ni, Cu or Zn), was investigated systematically and comparably in aqueous solutions by electrochemical and in situ UV-visible-near-IR spectroelectrochemical methods. Th…
Since 1D magnetic component models are widely used, it is very important to understand the range of their application. This work presents an analysis of 1D magnetic component models in order to study their range of application. The errors that can result when these models are not properly applied have been quantified.…
A synthetic semiconductive p-type diamond electrode was photosensitized by the Ru(bpy)32+ molecule in an electrolyte solution. The photoexcited molecule injects a hole into the valence band. However, under a certain potential, charge recombination occurred through interband states; the hole on the top of the valence b…
(1999). Recent advances in oxide-oxide composite technology. Advanced Composite Materials: Vol. 8, No. 1, pp. 17-23.
Oxidation of copper by atomic oxygen was found to differ significantly from oxidation by ordinary molecular oxygen. Firstly, a strong enhancement of oxidation was observed, particularly at the initial stages of oxidation (up to 106 times compared to molecular oxygen). The reaction probability of atomic oxygen is betwe…
Wear test was carried out by using the two disc type wear testing simulator to clarify the effects of the following factors on the surface deterioration in high alloyed grain cast irons. Namely, contact stress, microstructures, high temperature wear behavior and initiation and propagation of the surface microcrack whi…
Mixtures of two grades of boron nitride (BN) powder differing in their crystallinity were hot‐pressed in the presence of copper vapor. Two phenomena contributing to the bulk orientation have been recognized: the copper‐activated growth of microcrystalline BN grains, and the mechanical aligning of crystalline BN grains…
Oxygen permeation through composites consisting of four well‐known oxide‐ion conductors and a noble metal, or , is reported. The oxides were (YSZ) (BYC5), (SSC), and (LSGM). The results show that yields the highest oxygen permeation flux, but the composite deteriorates with time. The composites , , and give stable, bu…
Electron paramagnetic resonance and optical absorption studies of Cr3+ ions in fluorophosphate glasses have been carried out at room and low temperatures. The EPR spectra exhibit two resonances at g≈4.67 and g≈2.0. These resonances are attributed to isolated Cr3+ ions and exchange coupled Cr3+ pairs respectively. The…
The electrochemical behavior of oxide layers on aluminium was studied using electrochemical impedance spectroscopy. Impedance spectra were taken at a compact and a porous oxide layer of Al. The anodic films on Al have a variable stoichiometry with gradual reduction of oxygen deficiency towards the oxide-electrolyte in…
La notion de dissolution a ete developpee par Noyes et Whitney en 1897, et les recherches dans ce domaine n'ont pas cesse de croitre. Ceci nous a donne non seulement une meilleure comprehension du procede, mais a egalement cree de nombreuses applications dans des domaines differents. Dans le cadre des systemes d'admin…