Materials Literature
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Powders of twelve alkali halides have been coloured in an electrodeless discharge. Due to the simultaneous production and bleaching of F centres, F aggregate centres could be produced in an adequate concentration. From their study it has been concluded that powders behave as deformed single crystals. It could also be…
Le pouvoir réflecteur d'une surface plane artificielle coupée sur des monocristaux orientés, AgGaSe2 et AgGaTe2, a été mesuré entre 10 cm-1 et 400 cm-1 avec un interféromètre de Michelson avec E // c et E ⊥ c. Les résultats sont analysés par l'inversion de Kramers-Krônig et la méthode de Lorentz. La comparaison des fr…
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The implantation of several different ions into transition metals and transition metal carbides leads to a strong variation of Tc. In molybdenum layers, Tcwas found to increase after implantation of B, C, N, P, As and S ions up to a maximum value of 9.4 K at concentrations of about 25 at. %. No Tcincrease has been obs…
I. INTRODUCTION The various aspects of the degradation of poly(vinyl chloride) (PVC) have been extensively studied [1-10]. This is to be expected considering the wide-spread use of the material in both rigid and flexible plastics, in foams, and in thin films. An understanding of the effects of heat, light, and high-en…
The linewidth caused by the interaction between two-level defects in glasses has been measured through the change in the phase velocity and in the attenuation of a high frequency (9 GHz) ultrasonic wave when another ultrasonic wave of neighbouring frequency propagates in the sample. Experiments were made on several bo…
Ullmann-type condensation of 2,2′-oxydiphenol (2) with o-bromoanisole followed by treatment of the products with hydroiodic acid gave 2,2′-(o-phenylenedioxy)diphenol (4) and 2,2′-[oxydi-(o-phenylene)dioxy]diphenol (6). Similarly, compound (6) gave the homologous pentameric (8) and hexameric (10) diphenols. On condensa…
Fukalite occurs in spurrite-gehlenite skarns at Fuka, and Mihara, Okayama Prefecture, and at Kushiro, Hiroshima Prefecture. It is an alteration product of spurrite and is associated with calcite and/or xonotlite. It is found as pale brown to white crystals up to 0.2 mm long.The crystals are orthorhombic a 5.48(1), b 3…
De Gennes' theory of pretransition effects in the isotropic liquid crystal phase is generalized to include number density and orientational fluctuations. Order fluctuations produce more efficient local packing of rod-shaped molecules with a resulting fluid contraction. This mechanism is proposed to explain the anomalo…
The effect of neutron irradiation on the tensile deformation behavior of zirconium was examined at room temperature at various strain rates ranging of 2.2×10−4~2.2× 10−2 sec−1. The microstructure of the deformed specimens was observed by transmission electron microscopy. It was established that neutron irradiation dim…
The aqueous solution conformation of the gadolinium (III) complexes of the protonated, neutral, and singly deprotonated tetracycline species have been determined. The complete proton resonance assignment for each species is given. Evidence is presented for the site(s) of protonation or deprotonation as well as for int…
Functionalized silyl anions such as methyldimethoxysilyl anion and methoxydimethylsilyl anion were first prepared in common solvents and allowed to react with organic halides giving rise to functional organosilicon compounds.
Single‐layer, high‐purity Al films approximately 0.1 μm thick were made by high‐rate planar magnetron sputtering at rates above 12 nm/s. Reflectance in the visible was found to be at least as high as that reported for carefully made evaporated films. Enhanced reflectors of the standard metal/low/high design were made,…
Tetra-arsenic triselenide, As4Se3, has been synthesized and isolated in two polymorphs of which α-As4Se3 is isostructural with α-As4Se3. It is orthorhombic, space group Pnma, with Z= 4, in a unit cell of dimensions a= 9.46(2), b= 7.97(2), c= 10.47 (2)Å. The 75As n.q.r. spectrum at 77 K shows three resonances with inte…
The tetra-aminotriafulvalene dication (3), the first dication of the simplest fulvalene, has been synthesized and its spectroscopic characteristics are briefly described.
The cation distribution in CoAl2O4 and in several CoχMg1–χAl2O4 solid solutions with χ ranging from 0.05 to 0.5 has been studied by magnetic susceptibility, reflectance spectroscopy, lattice parameter variation and analysis of some X-ray reflections whose intensities are particularly sensitive to variation in cation p…
The electrical life of micaceous insulation for high-voltage electrical machines was investigated by means of accelerated voltage endurance tests under carefully controlled operating conditions. The aging mechanism is assumed unchanged when the insulation is subjected to dielectric field strengths up to ten times norm…
Magnetization and susceptibility measurements, over the range 4.2-295 K have been made on single crystal TbIG along the (111) direction. The paramagnetic Curie point and the Curie constant are markedly different from the values established by Pauthenet in polycrystalline samples. The effects of the crystalline field a…
Abstract Results of dynamic mechanical spectroscopy, infrared spectroscopy, and tensile stress‐strain data show that the non‐ionic surfactant Igepal CO‐630, often used as a stress cracking agent, and water are absorbed by high density polyethylene to cause an internal stress relaxation of the intercrystalline tie mole…
A quantitative analysis has been made on the initiation of crevice corrosion on the following assumption: (1) The pH in crevice is uniquely determined by the total charge passed as passive current, and (2) the crevice pH decreases to depassivation pH at which active dissolution, crevice corrosion, initiates.The obtain…