Materials Literature
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Dissolution at metal surfaces may be structurally or non-structurally dependent. The effects of grain boundaries, interfaces between discrete phases, non-metallic inclusions, and slip lines in promoting structurally dependent attack are considered in the context of a variety of metal-environment systems. Pitting and f…
Rare earth doping of CaF2 produces material which gives strong thermoluminescence signals. In an attempt to separate the influence of impurity and intrinsic defects CaF2 has been implanted with ions of Ce, Dy, Mn, Ca and F. Comparisons are made with chemically doped samples and the effect of thermal treatments have be…
The reaction of N4P4Cl8(1) with sodium phenoxide (or phenol in the presence of triethylamine) has been studied under a variety of experimental conditions. The chloro(phenoxy)-derivatives, N4P4Cl8–n(OPh)n[n= 1 or 2 (mixture of four non-geminal isomers), 3(mixture of non-geminal isomers), 4(mixture of isomers), 5(mixtur…
Structural, thermodynamic, and kinetic properties and phase diagrams of hydrogen in metals and alloys are presented in relation to materials development for the ‘hydrogen energy technology'. Among the materials considered special attention is paid to the hydrides of Li, Mg, Y, V, Nb, U, TiFe, and LaNi5. It is shown ho…
Abstract Symmetric and asymmetric EC cells are here fabricated using amorphous W0 3 ‐Mo0 3 ‐V 2 0 5 films vacuum‐evaporated on substrates prepared in electrolyte of lithium perchlorate and propylene carbonate. Dependences of the reflection spectra of symmetric cells and the transmission spectra of asymmetric cells on…
Unmodified kaolinitic clays have semi-reinforcement properties in natural rubber. The amount of kaolinite is favourable to reinforcement, the amounts of quartz and mica is prejudicial. Properties connected with crystallinity and consequently with fineness are the second reason why vulcanized products vary : these are…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation F. Bauer; Behavior of ferroelectric ceramics and PVF2 polymers under shock loading. AIP Conf. Pro…
A brief historical view of the origin, development, and application of the light comparison microscope is given. Problems emanating from restricted depth of focus in light-microscopical techniques are eliminated by utilizing the scanning electron microscope. Various attempts have been made to use the scanning electron…
One-electron reduction of the title complex leads o an extremely stable ring-reduced radical which has been isolated and characterized; addition of a second electron leads to, among other products, the free base tetraphenylporphine via an internal electron transfer.
The crystal structure of a new sulfosalt, TlHgAs 3 S 6 , has been determined. The crystal is monoclinic with space group P 2 1 / n . Four formula units are contained in a unit cell of dimensions a 0 = 5.948(2) Å, b 0 = 11.404(6) Å, c 0 = 15.979(5) Å, β = 90.15(1)°. The structure was determined by direct methods and re…
Abstract Experience with polytype families of layered structures and the theory of OD structures consisting of layers made it possible to elaborate generally applicable principles for a full description of polytypes by symbols. According to these principles, the exact stacking sequence of building layers (BLs) in any…
Abstract not Available.
When HF is bubbled through a solution of [Nb2L2O3](L = porphyrinate), porphyrinatoniobium oxide fluoride complexes are formed. The structures of some of these complexes have been studied from analytical and spectroscopic data. The title compound has been determined by X-ray diffraction methods. Crystals are monoclinic…
The ordering process during continuous heating in Cu-Pd alloys containing 34.74∼44.80 at%Pd was investigated by means of electrical resistivity measurements, X-ray diffraction, hardness test and transmission electron microscopy.In all alloys, the electrical resistivity increased slightly in the early stage of ordering…
The site-transfer conductivity expression σ=ne2a2ν/6 kT has been further tested for K3(MnO4)2 by observations of the d.c. conductivity, σ, and of the electron-transfer frequency, ν, from dielectric relaxometry, over a temperature range, providing good agreement both individually and in activation energies E: ν/ν0= exp…
Sodium theophylline monohydrate was precipitated from ethylene diamine solution of theophylline by adding aqueous sodium chloride solution to the system with or without ethanol. The dried precipitates were redispersed in the filtrate without ethanol and were agglomerated with water liberated from the system by adding…
Abstract The crystal structure of diaqua(meso-tetraphenylporphinato)cobalt(III) perchlorate, [CoIII(tpp)(H2O)2]ClO4, has been determined by the X-ray method. The compound crystallizes in the monoclinic space group P21/c with four molecules in a unit cell of dimensions, a=13.93(4) Å, b=23.46(2) Å, c=17.35(6) Å, and β=1…
It is intended to describe the swelling characteristics of fissile pins clad with solution annealed 316 and irradiated in the fast reactors RAPSODIE and PHENIX. On these materials the effects of the irradiation parameters (damage rate, time and temperature) and of the chemical composition of the steel before irradiati…
In a loss-of-coolant accident (LOCA) the temperature of the cladding of some fuel rods may rise to levels [650 to 810°C (1202 to 1490°F)] where the ductility of Zircaloy is high (∼80 percent). The net outward pressure which will obtain if the coolant pressure falls to a small fraction of its normal working value produ…
La présente étude concerne l’amélioration de la technique de préparation de catalyseurs molybdène-silice, réalisée par greffage, c’est-à-dire par condensation de pentachlorure de molybdène sur les groupes silanols du support, dans divers solvants organiques.