Materials Literature
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There are cases in which different lattices give calculated powder patterns with the identical number of distinct lines in identical 20 angular positions. The number of planes (hkl) contributing to each reflection may differ, however. The lattices having this property are related to each other by transformation matric…
The magnetocrystalline anisotropy constants k 1 , k 2 and k 3 of iron and of alloys of 1.75, 2.46, 3.56 and 4.59 weight per cent silicon in iron have been measured in the temperature range 4.2-295 K. The measurements have been performed on spherical samples. The field dependence of the anisotropy constants K n ( n = 1…
Electrical conductivity measurements have been made on single crystals of undoped potassium sulfate and on single crystals of K 2 SO 4 doped with divalent ions, viz. Mg 2+ , Zn 2+ , Cu 2+ , and Mn 2+ . The presence of the divalent ion increases the cation migration energy. The lower defect formation energy is attribut…
Void growth during neutron or charged-particle irradiation at temperatures in the range 0.4Tm⩽T⩽0.6Tm is described in pure metals and in metals containing impurities which trap interstitials. It is shown that the equations for the steady state can be integrated analytically. For cases in which strong trapping occurs t…
Tritium absorption was determined in Type 304L austenitic stainless steel by analyzing concentration gradients obtained during prolonged exposures to high-pressure gaseous tritium. The calculated tritium diffusivities at temperatures greater than 373 K were shown to be in excellent agreement with the equation where m…
High green density UO2 powder compacts were annealed over a range of temperatures to establish the sintering mechanisms for open and closed porosity. During the intermediate stage of sintering the interconnected porosity was found to sinter at a rate consistent with a volume diffusion process dependent on the instanta…
The elastic moduli Et of crystal lattices of polymers perpendicular to molecular chain axis are dependent on the intermolecular forces, and can be determined by an X-ray diffraction method. At first, the assumption of “homogeneous stress distribution” used in the evaluation of Et was confirmed experimentally. The Et v…
The theory of translational diffusion in nematic liquid crystals is developed from the standpoint of hydrodynamics and molecular-hydrodynamic interactions. The anisotropy of the diffusivity is obtained and related to the orientational order parameter, viscosity coefficients, and the detailed molecular geometry. Liquid…
Abstract Komplexe des Ni II , Rh I , Pd II , Pt II , Au III und Cu II mit 1, 3, 4‐Thiadiazol‐2, 5‐dithiol wurden dargestellt. Auf Grund analytischer, magnetischer und spektraler Daten werden Strukturen vorgeschlagen. Kristallfeld‐Parameter wurden in Übereinstimmung mit den vorgeschlagenen Strukturen berechnet.
A normal vibration analysis has been carried out for crystalline syndiotactic poly(vinyl chloride) and its deuterated derivatives. This was based on a general valence force field derived from an analysis of the spectra of small secondary chloride molecules. The calculations permit a very satisfactory assignment to be…
The sulfonation of meso-tetraphenylporphyrin, in concentrated sulfuric acid followed by neutralization and dialysis, provides an efficient and convenient route to meso-tetra(4-sulfonatophenyl)porphyrin.
The increasing demand for finely powdered boron carbide together with the rapidly rising cost of this material has stimulated research into alternative methods for its production. When boron trichloride is reacted with methane‐hydrogen mixtures in a radio frequency argon plasma, boron carbides of variable B/C ratios a…
Abstract Clay (<2 μ m) and fine silt (2–20 μ m) fractions of twenty seven soil samples from eight tropical ferruginous profiles of the Mysore Plateau (India) were analysed for kaolinite by dehydroxylation and selective dissolution. The considerable amounts of iron extracted by the procedure and the closeness of the Si…
The general incompatibility of polymers may be overcome by suitable compatibilizing agents, i.e. block or graft copolymers having segments of similar structure or solubility parameter as the polymers being mixed. Presence of a compatibilizing agent influences the properties of polymer blends and alloys as well as poly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and reactions of new complexes of nickel, palladium, and platinum with 1,2-ethanedithiol, 2-(methylthio)ethanethiol, and 2-(methylthio)ethane disulfideThomas B. Rauchfuss and D. Max RoundhillCite this: J. Am. Chem. Soc. 1975, 97, 12, 3386–3392Publication Date (Prin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of metal particle size on the chemisorption properties of supported platinum. Analogy with cluster compoundsM. Primet, J. M. Basset, E. Garbowski, and M. V. MathieuCite this: J. Am. Chem. Soc. 1975, 97, 13, 3655–3659Publication Date (Print):June 1, 1975Publication…
The magnetizations of Ni-Rh alloys on either side of the critical composition for ferromagnetism (${c}_{\mathrm{crit}}\ensuremath{\approx}63\ensuremath{-}\mathrm{a}\mathrm{t}.%\phantom{\rule{0ex}{0ex}}\mathrm{N}\mathrm{i}$) were measured between 4.2 and 250\ifmmode^\circ\else\textdegree\fi{}K in fields up to 56 kOe. T…
Abstract The idealized symmetry of kaolinite-type minerals (1:1 phyllosilicates) is analysed in detail. They can be considered as OD-structures consisting of three kinds of OD-layers. Each of them, taken separately, possesses higher symmetry than their combination. This explains the well-known tendency of kaolinite-ty…
Abstract Formation of free radicals in photoirradiated cellulose has been studied by means of ESR spectroscopy at 77°K. Three kinds of light sources with different wavelengths between 2500 and 4000 ÅR were employed. No radicals detectable by ESR were recorded when cellulose was irradiated with light of wavelength long…
Abstract Twelve force constants in the general quartic force field of carbon disulfide have been determined by a least-squares method from the available spectroscopic data on four isotopic species of carbon disulfide: 12C32S2, 13C32S2, 12C32S34S, and 13C32S34S. A reasonable set of force constants is obtained together…