Materials Literature
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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.
Pore migration in KCl crystals subjected to a temperature gradient occurs by a vaporization‐condensation mechanism. The behavior of small (<100 μm) pores was observed using hot‐stage microscopy. A size‐dependent probability of pore motion was noted in which the fraction of mobile pores in a given size range steadily i…
By melt-quenching technique, nonequilibrium austenitic alloys possessing high strength and hardness combined with good ductility have been found in Fe-C-Mo and Fe-C-W ternary systems. This formation region is limited to about 1.0 to 2.4wt% C and 3 to 22wt% Mo for Fe-C-Mo system and 1.0 to 2.4wt% C and 3 to 24wt% W for…
Pressure tubes for CANada Deuterium Uranium Pressurized Heavy Water reactors are made from Zr-2.5Nb by extruding preheated hollow billets into tubes that are cold-worked 30 percent to size. The fabrication process produces fine elongated α-grains with a high dislocation density which makes a large contribution to the…
The thermoluminescent properties of magnesium borate, a new tissue equivalent material, have been stu died.
A Landau-Ginzburg Hamiltonian describing a liquid crystal in the nematic phase near the nematic-columnar phase transition is used to find the renormalized nematic elastic constants and viscosities. The elastic constants, with the exception of the bend elastic constant, are found to be enhanced by order parameter fluct…
Ni(SCN) 2 (NH 3 ) 2 and Ni(SCN) 2 are stable intermediates in the course of the thermal decomposition reaction Ni(SCN) 2 (NH 3 ) 4 → NiS 2 . Ni(SCN) 2 (NH 3 ) 2 crystallizes in the monoclinic space group C 2/ m with a = 8.698(5), b = 7.991(4), c = 5.619(3) Å, β = 105.91(9)°, Z = 2, D x = 1.85g cm −3 . The crystal data…
Seven batches of Zircaloy-2 tubing with widely different textures were processed from tube shells of the same size, by different reduction routes using pilger and 3-roll mills. Based on the texture data of these tubes, the texture control of Zircaloy tubing, the texture gradient across the wall, and the texture change…
The rolling contact (RC) fatigue test rig was developed specifically for rapid and inexpensive evaluation of materials and processes for rolling element bearing applications. The simple geometry of the test specimen, a cylindrical bar, makes it ideal for evaluating new materials where only limited quantities of the ma…
Acetoacetic esters and pentane-2,4-dione undergo unusual Michael reactions with β-nitrostyrene in methanolsodium methoxide to formthe (2R,3R,2′S,3′S)-bis-(4-acy1-2,3-dihydro-5-methyl-3-phenyl-2)-furylhydroxylamines (5) in high yields. The normal adducts (6) are intermediates in these reactions. Acetylation of compound…
It was found that the corrosion rate of CuNi10Fel·4 in aerated sea water at 40 and 50°c was lower than that at the lower sea water temperatures of 10–30°c. This was mainly due to the quick formation of a protective layer of corrosion products at the higher temperatures. Moreover, the protectiveness of these layers app…