Materials Literature
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Abstract Solid solutions with the general formula Bi 1– x Ca x MnO 3 (0.2 ≦ x ≦ 1) are found to possess the perovskite structure. The phase diagram based on X‐ray diffraction studies involving cubic, orthorhombic and monoclinic modifications is constructed. It is concluded from conductivity and X‐ray data that the tra…
The heats of reaction of arsenic with fifteen group 3A metals have been measured by means of dynamic differential calorimetry. The heats of formation obtained at the reaction temperatures, in kcal/mole, are as follows: ScAs, –65.2 ± 6.0; YAs, –77.4 ± 3.4; LaAs, –73.0 ± 4.5; CeAs, –68.9 ± 3.0; PrAs, –73.4 ± 3.1; NdAs,…
Stress corrosion cracking of titanium: 8% Al‐1% Mo‐1% V alloy notched tensile specimens was investigated in various salt solutions under potentiostatic conditions. Stress corrosion cracking of duplex annealed Ti: 8‐1‐1 alloy occurred in chloride, bromide, and iodide solutions, but did not occur in other solutions such…
Abstract The preparation and properties of aliphatic and aromatic polyimides are reviewed. The discussion includes a comparison of methods of synthesis of the aliphatic vs. aromatic polymers and a detailed consideration of chemical structure vs. properties. The discussion of properties includes, in addition to propert…
The structures of cytochalasins A and B, metabolites of Helminthosporium dematioideum showing novel effects on mammalian cells, have been determined. Cytochalasin B is identical with phomin. (–)-α-Methyladipic acid is shown to have the R-configuration contrary to a previous assignment; the absolute configurations of t…
The structural transformation of the CsCl-type compound TiNi has been investigated by X-ray-diffraction, calorimetric, and metallographic methods. The transition is a first-order one, with a latent heat of 370 ± 20 cal/g-atom. It occurs rapidly and with small hysteresis in bulk material, the transition temperature var…
The preparation and magnetic properties over a temperature range of iron(III) oxy-bridged binuclear Schiff-base complexes have been studied. The magnetic properties have been analysed on a dipolar coupling mechanism and the interaction found to be virtually independent of the nature of the substituent on the Schiff ba…
In part I (1965, Adv. Phys., 14, 101), a theory was developed which treated the thermodynamics of dielectric and anelastic relaxation due to point defects in crystals from the viewpoint of the point symmetry of the defect as well as of the crystal. In the present paper this theory is extended to treat the kinetics of…
Cathodically reduced iron was anodically oxidized at potentials in the passive region of the anodic polarization curve in slightly basic sodium borate‐ boric acid solutions by means of a potentiostat. The kinetics of film growth were studied using an ellipsometer coupled with a fast recording technique, which enabled…
Amorphous aluminum oxide films were deposited at 420°C by thermal decomposition of an aluminum alkoxide. The reducing or oxidizing atmosphere used during deposition affects the chemical and electrical properties of the oxide films. These films have shown superior characteristics when compared to SiO 2 films deposited…
The preparation and spectral and magnetic properties are reported for the complexes of the type Co(imidazole)6X2 and Ni(imidazole)6X2(X = Cl, Br, l, or NO3) and Cu(imidazole)4X2(X = Cl or NO3). These compounds have octahedral or distorted octahedral structures whereas the compounds Co(imidazole)2Cl2 and di-imidazolato…
For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer science and technology.
The development of an acoustical thermometer for use in graphite matrix nuclear fuel elements is described. Test results indicate that this thermometer accomplished the objective of automatically, accurately, and reliably recording temperatures of a number of sensors. The acoustical thermometer system offers a wider c…
Methylation of the terminal nitrogen atom in the planar hydrazones of aliphatic aldehydes and ketones causes a red shift in the ultraviolet absorption spectrum, readily interpreted by Hückel molecular orbital calculations using the heteroatom model for the methyl group. In ketone NN-dimethylhydrazones, Me2N·N:NR1R2, w…
Abstract The shift of phonon frequencies in anharmonic crystals is calculated self‐consistently by a canonical transformation equivalent to Cowley's quasi‐harmonic approximation. The damping of phonons is obtained from the phonon kinetic equations in the above approximation.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermochemistry of cobaltous hydroxideLewis M. Gedansky, Gary L. Bertrand, and Loren G. HeplerCite this: J. Chem. Eng. Data 1967, 12, 1, 135–137Publication Date (Print):January 1, 1967Publication History Published online1 May 2002Published inissue 1 January 1967https://pubs.…
Abstract The shape of the dynamic moduli vs. temperature curves of polymers fundamentally depends on the temperature dependence of the relaxational properties of the polymers. When the frequency dependence of the reduced loss modulus is represented by an empirical function describing the dispersion peak, the distribut…
Abstract A high molecular weight poly(α‐methylacrolein) was obtaiiied with a yield of about 100% in the presence of a redox system and its strncture was investigated. It was established that the intrinsic viscosity of the polymers increases during the polymerization. It was shown that high molecular weight. poly(α‐met…
Abstract Transfer reactions of primary radicals formed by decomposition of dicumyl peroxide in atactic polypropylene–polyethylene blends give rise to the corresponding macroradicals. A mutual recombination of polypropylene and of polyethylene macroradicals leads to the formation of hybrid copolymer. From the values ob…
Recently several 6-coordinate metal complexes have been shown to exhibit a trigonal-prismatic rather than an octahedral structure. The events leading to the discovery of the new coordination geometry are placed in historical perspective. The evidence which led to assigning the trigonal-prismatic structure to many of t…