Materials Literature
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Optical theorems for three-to-three processes are derived from S-matrix principles. These theorems express all single, double, and multiple discontinuities across all combinations of normal threshold cuts in terms of physical scattering amplitudes. The 216 functions corresponding to all combinations of sides of the 16…
Rectified diffusion is a mechanism whereby a gas bubble, set into pulsation by a sound field, grows in size because of an effective gating action by the bubble surface area. Bubbles that might otherwise dissolve will grow instead if the sound pressure amplitude exceeds a threshold that depends on the bubble size. A th…
Several modifications of TlInS 2 crystallize from melts of this composition with annealing at various temperature. Symmetries and lattice parameters determined by the x-ray precession method are as follows: I. ( = β ), monoclinic, a ∼ b = 7.76 ± 0.01 Å, c = 30.01 ± 0.02 Å, β = 90°10′ ± 5′, P 2 1 / m , Z = 16, D x = 5.…
Experiments were undertaken on the incorporation in plastics—polyethylene in particular—of radioactive spent ion exchange resins produced in nuclear power plants. The resulting polyethylene products burdened with radioactive resin were tested to ascertain the properties considered important for radioactive waste manag…
The change in the fraction crystallinity with time and elongation of synthetic cis-1,4-polyisoprene is studied through simultaneous measurement of birefringence and stress. Results are compared with values estimated from the decrease in stress arising from the crystallization. Various methods for calculating the cryst…
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…