Materials Literature
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A mass transport equation which takes into account parallel diffusion paths for both anions and cations was derived and applied to the diffusional creep of polycrystalline ionic solids. From the results of the analysis, several limiting conditions were found for grain‐boundary‐ and lattice‐diffusion‐controlled kinetic…
Abstract An investigation has been carried out to determine the influence of operating conditions on the character of the final product resulting from the polymerization of ethylene in a radio‐frequency discharge. It has been found that low pressures and high ratios of discharge power to gas flow rate lead to the depo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriplet-state phosphorescence of adsorbed ionic organic molecules at room temperatureEdward M. Schulman and Cheves WallingCite this: J. Phys. Chem. 1973, 77, 7, 902–905Publication Date (Print):March 1, 1973Publication History Published online1 May 2002Published inissue 1 Mar…
Selected-area electron diffraction and x-ray diffraction have been used to study microstructure of spherulites in thin films of isotactic polypropylene crystallized from the melt. Our purpose has been to seek an explanation for a branching habit, unique to this polymer, in which parent and daughter lamellar crystals m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 spin-lattice relaxation in benzene and substituted aromatic compoundsGeorge C. Levy, Joseph D. Cargioli, and F. A. L. AnetCite this: J. Am. Chem. Soc. 1973, 95, 5, 1527–1535Publication Date (Print):March 1, 1973Publication History Published online1 May 2002Publishe…
One of the most striking features of recent research on structure/property relationships in two-phase alloys has been the swing towards the establishment of rigorous quantitative theoretical models and the associated attempts to obtain the necessary experimental data to test these models. This compares favourably with…
The single-crystal elastic constants of a commercial superconducting alloy Ti–40 at.% Nb have been measured at 298 °K. The results are C11=156.5±0.4 GPa, C12=111.6±0.4 GPa, C44=39.63±0.08 GPa, and C′=22.47±0.04 GPa. The value of C′ predicted by an empirical expression involving the effective electron-to-atom ratio, e*…
Abstract The study of carbon black transfer by BR crystallization, elastic modulus, and electrical conductivity provides convincing evidence that carbon black does not transfer from SBR, BR, and NR—all highly unsaturated polymers— when compounds are made by conventional Banbury and mixing procedures. This agrees with…
Coincidence-site lattices are characterized mathematically, in the general case, by a method that can be applied to a pair of original lattices of any symmetry, either metrically identical or metrically different, does not involve inspection and is readily adaptable to computer calculations. The procedure is illustrat…
It is possible to set up equations of the formB(H) = a_{0} + a_{1} e^{-\alpha_{1}H} + a_{2} e^{-\alpha_{2}H} + a_{3} e^{-\alpha_{3}H} + a_{4} e^{-\alpha_{4}H}on an analog computer to fit accurately aB-Hcurve of any magnetic material over the whole range from zero to the knee of the curve to the saturation part of the…
Hall-effect measurements as a function of temperature have been made on single-crystal samples of V${\mathrm{O}}_{2}$ at temperatures both above and below the semiconductor-to-metal transition temperature; the Hall mobility in the semiconducting phase was approximately 0.5 ${\mathrm{cm}}^{2}$/V sec and in the metallic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-frequency infrared spectra of complexes which exhibit magnetic crossover. I. Iron(II) complexes of 1,10-phenanthroline and 2,2'-bipyridineJames H. Takemoto and Bennett HutchinsonCite this: Inorg. Chem. 1973, 12, 3, 705–708Publication Date (Print):March 1, 1973Publication…
Abstract Azoverbindungen sind durch einen tiefliegenden 1(n,π*)‐Elektronenzustand charakterisiert, dem im Absorptionsspektrum eine langwellige, schwache Bande entspricht. Kopplungen dieses Zustands mit anderen tiefliegenden Molekülzuständen sind die Ursache der für verbotene Übergänge hohen Intensität, der Strukturlos…
Crystallographic notation for Al 2 O 3 is reviewed, with particular reference to the correct basis to be used in describing slip systems. A Groves‐and‐Kelly calculation showed that the combination of pyramidal slip on {11¯02}<11¯01> and basal slip on (0001){112¯0} will allow homogeneous deformation of Al 2 O 3 p…
In vacuum, the surface of insulators becomes electrically charged when subjected to high-voltage stresses. The charging mechanism is described. A model simulating the charging shows that the surface charge densities are proportional to the applied voltage and depend on the secondary electron emission of the dielectric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew series of anhydrous double nitrate salts of the lanthanides. Structural and spectral characterizationW. T. Carnall, S. Siegel, J. R. Ferraro, B. Tani, and E. GebertCite this: Inorg. Chem. 1973, 12, 3, 560–564Publication Date (Print):March 1, 1973Publication History Publi…
This paper presents the results of our measurement of the room-temperature thermal conductivity of the Ga1−xAlxAs alloy system. The study was motivated by our need to characterize the thermal properties of cw heterostructure lasers, in which the heat generated in the optically active layer must flow through a substant…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrder-related properties of some nematic liquidsI. Haller, H. A. Huggins, H. R. Lilienthal, and T. R. McGuireCite this: J. Phys. Chem. 1973, 77, 7, 950–954Publication Date (Print):March 1, 1973Publication History Published online1 May 2002Published inissue 1 March 1973https:…
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