Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of tris(glycinato)chromium(III) monohydrate, Cr(C2H4NO2)3.H2ORobert F. Bryan, Peter T. Greene, Peter F. Stokely, and Edmond W. Wilson Jr.Cite this: Inorg. Chem. 1971, 10, 7, 1468–1473Publication Date (Print):July 1, 1971Publication History Pub…
In ${\mathrm{Y}}_{2}$${\mathrm{O}}_{2}$S: Eu and ${\mathrm{La}}_{2}$${\mathrm{O}}_{2}$S: Eu, excitation into the charge-transfer states (CTS) of ${\mathrm{Eu}}^{+3}$ leads partially to the dissociation of the CTS into ${\mathrm{Eu}}^{+2}$ and a free hole which may subsequently be trapped. The extent of CTS dissociatio…
Abstract Mit Hilfe papierchromatographischer, kinetischer und röntgenographischer Methoden wird gezeigt, daß das Tetramethylammoniumsilicat der Zusammensetzung 1 N(CH 3 ) 4 OH · 1 SiO 2 · ∼8 H 2 O nicht – wie bisher angenommen – ein Poly‐ oder Phyllosilicat, sondern ein Tetra‐anhydrido‐bis‐cyclotetrasilicat (Doppelvie…
A refinement of the structure of anorthite has been completed on crystals from Val Plasmeda, Tyrol, Austria. Atomic parameters and significant bond lengths and angles are reported. The residual error index R is 6.0°/o.
Abstract Clay beds 1–2 m thick and interbedded with marine limestones probably of early Eocene age are composed of nearly pure mixed-layer kaolinite-montmorillonite. Particle size studies, electron micrographs, X-ray diffraction studies, chemical analyses, cation exchange experiments, DTA, and TGA indicate that clays…
Abstract The rate of gel formation and color formation in poly(hexamethylene adipamide), nylon 66, is found to be dependent upon the rate of removal of the volatile products of degradation. If a sample of nylon is heated above its melting point in a sealed tube, the material will remain soluble for extended periods of…
The Dzialoshinsky-Moriya (DM) antisymmetric exchange interaction between superexchange-coupled ions in antiferromagnetic salts is shown to contribute to the exchanged-narrowed electron-paramagnetic-resonance (EPR) linewidth in the paramagnetic state. The contribution of antisymmetric exchange to the second and fourth…
Transient nuclear spin-lattice relaxation measurements have been made in indium metal and the InCd, InTl, InSn, and InPb dilute alloy systems, using the ${\mathrm{In}}^{115}$ nuclear-quadrupole-resonance (NQR) spectrum. The theory of spin-lattice relaxation in NQR is described for both magnetic and quadrupolar contrib…
Previous work on the rapid formation of a hydride of SmCo5 at room temperature is confirmed. It is shown that the rate of release of hydrogen is related to the rate of transformation of the hydride to the unhydrided compound, rather than by bulk diffusion of hydrogen. The rate-controlling step is probably the allotrop…
Hole concentration of CuI thin film decreased but Hall mobility increased with the rise of reaction temperature of copper films with iodine vapor. The heat-treatment of CuI film in vacuum brings out the decrease of hole concentration because of the escape of excess iodine from the film. Oxygen diffuses into the bulk o…
Tensile and four-point bend tests on specimens of polycrystalline copper – 8 wt% aluminum coated with mercury have shown that plastic deformation is a necessary precursor to intergranular fracture. The existence of long cracks associated with unfailed notches indicates that a period of stable crack growth precedes fai…
A study has been made of the effects of crystal axis orientation on the slip behaviour, at 1600°K, of compressively deformed uranium dioxide single crystals. It is shown that the critical resolved shear stress for slip is anisotropic, and that the stress is sensitive to ionic configurations at the dislocation core. Th…
This report presents the results of research undertaken with the aim of attaining a better knowledge of flashover mechanism on polluted insulators. Using results already obtained by other authors, the arc development under alternating voltage was studied on an insulating surface of a simple geometry coated with a cond…
The electronic transformer is a device which behaves in the same manner as a conventional power transformer in that it steps voltage levels up or down while providing isolation and can accommodate load current of any power factor. It contains thyristor power switches which convert the low-frequency (dc to 400-Hz) volt…
Associations of planktonic diatom species in four epipelagic environments of the North Pacific have been defined using a recurrent group analysis. The distribution of the groups was related to the physical habitats. Within conservative environments the species associations appear relatively permanent, undergoing minor…
X ray and neutron diffraction analysis may give only limited information about the ordering of the atoms in Heusler alloys. As a first step towards a more systematic interpretation of the experimental data, a procedure which involves the sampling of ordering space at discrete points is described and applied to various…
Abstract The relative compatibility of eight different commercially available elastomers, blended in two-way combinations in three different proportions, was measured as a function of zone size on phase contrast optical micrographs using the Quantimet Image Analyzing Computer. Average cross sectional areas of the disp…
Abstract The migration of small cations into the empty octahedral sites of dioctahedral clays allows one to study the local effects in the trioctahedral structure and the consequences of the exchange capacity decrease on the solvation properties. The results concern essentially the montmorillonite saturated by lithium…
The effect of benzotriazole (BTA) on corrosion of copper in 5% NaCl has been studied by immersion tests, potentiostatic polarization, AC impedance measurements, and ellipsometric investigations. It was found that BTA when present in the corrosive environment is a good inhibitor. The good electronic conductivity of the…
Abstract Heats of fusion, melting transitions, and the derived entropies of fusion were obtained by differential scanning calorimetry for examples from three homologous series of homopolymers having long side chains. Homopolymers having side‐chain lengths between 12 and 22 carbon atoms were chosen from the poly( n ‐al…