Materials Literature
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Growth of Co 3 O 4 layers on the (100) surface of single crystal CoO was investigated in air at 700° and 800° C. These layers were of duplex structure due to simultaneous inside and outside growth. Measurements on the position of inert gold markers demonstrated that cobalt migration outward in Co 3 O 4 was the dominan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrigins of homogeneous and inhomogeneous line widths of the 5D0-7F0 transition of europium(3+) in amorphous solidsJ. R. Morgan, E. P. Chock, W. D. Hopewell, M. A. El-Sayed, and R. OrbachCite this: J. Phys. Chem. 1981, 85, 7, 747–751Publication Date (Print):April 1, 1981Publi…
Programmed cooling experiments using a synthetic diopside glass and constant cooling rates of from l0o to 300oC,/hr first crystallize forsterite and then with decreasing temperature clinopyroxene + wollastonite. The forsterite grows as hopper-shaped crystals which then develop dendrites from external corners. The morp…
Abstract Allophanes with SiO 2 /Al 2 O 3 molar ratios from 1.38 to 1.92 were heated at temperatures up to 500°C, and the changes induced were investigated by means of infrared spectroscopy (IR) and X-ray powder diffraction (XRD). Heat treatment caused the IR absorption band near 1000 cm −1 due to Si-O stretching to sh…
The refractive indices and the densities of CB-7, PCH-7 and CCH-7 are measured. An equation that relates the optical frequency permittivity tensor to the molecular polarizability tensor for nematic liquid crystals is obtained. The derived equation gives consistent results not only for the nematic phase, but also for b…
Grain‐oriented ceramics of ferroelectric lead metaniobate have been prepared by molten salt synthesis of anisotropic crystallites followed by doctor blade casting. The sintered ceramics have an orthorhombic texture with elongated c axis grains parallel to the casting direction. This allows efficient poling in directio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the 1:2 aluminum trichloride-tetrahydrofuran complex AlCl3.2THFAlan H. Cowley, Mike C. Cushner, Raymond E. Davis, and Paul E. RileyCite this: Inorg. Chem. 1981, 20, 4, 1179–1181Publication Date (Print):April 1, 1981Publication History Publi…
An approach to determining synchronous machine parameters by low-voltage frequency response tests with the machine stationary will be described. The tests are simple and safe. In addition, they provide a more detailed and complete model of the machine than the accepted standard methods/1/. The standard tests rely heav…
The influence of the flexibility of the polymer main chain on the smectic ordering has been investigated, by means of optical, diffractometric and calorimetric techniques, in several polymers carrying rigid anisometric side-groups. The effect of the chemical structure of the sidegroups has been examined throughout: at…
Field studies using a chamber technique to measure emissions of nitrous oxide (N 2 O) showed that the N 2 O emissions induced by fertilization of soil with anhydrous ammonia (180 kg N ha −1 ) were markedly reduced by addition of nitrapyrin [2‐chloro‐6‐(trichloromethyl)‐pyridine] to this fertilizer. The emission of N 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal growth, electrical resistivity, and magnetic properties of lanthanum titanate and cerium titanate. Evidence for a metal-semiconductor transitionDavid A. MacLean and J. E. GreedanCite this: Inorg. Chem. 1981, 20, 4, 1025–1029Publication Date (Print):April 1, 1981Publi…
A comprehensive treatment of ATR spectra on the basis of the Lorentz-Lorenz law and Fresnel equations is given. The standard equation for the effective thickness is redefined showing how the lossy case deviates from the lossless case. A matrix effect due to the influence of the real part of the refractive index within…
Abstract The tissue‐specific fibroin product of the large ampullate glands of the spider Nephila clavipes was isolated and analyzed with respect to homogeneity and size. The solubilized luminar contents of the glands migrate as a homogeneous band in SDS electrophoresis. Its molecular mass has been estimated to be appr…
The optical properties of freestanding and dielectrically backed inductive metal meshes are investigated in the far IR spectral regime. The most pronounced effect of the substrate is to cause a shift in the diffraction edge to longer wavelengths by a factor equal to the substrate index of refraction. Various theoretic…
Abstract The catalyst system obtained by the equimolar reaction of diethylaluminium chloride with α,β,γ,δ‐tetraphenylporphine exhibits high catalytic activity in the polymerization of propylene oxide to give a polymer with a narrow molecular weight distribution. Average molecular weight of the polymer can be controlle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear complexes of macrocyclic ligands: variation of magnetic exchange interaction in a series of six-coordinate iron(II), cobalt(II), and nickel(II) complexes and the x-ray structure of a binuclear iron(II) macrocyclic ligand complexClifford L. Spiro, Susan L. Lambert,…
We report measurements of the equilibrium concentration and of the elastic modulus for polystyrene networks containing controlled amounts of pendent chains that have been swollen in benzene and cyclohexane. The results are compared with the predictions of the classical theory of rubber elasticity and of a new approach…
The critical β for stability against ideal hydromagnetic internal ballooning modes as a function of the toroidal mode number, n, is calculated for two different equilibrium sequences by use of a finite-element technique (n ≲ 20), and a WKB formalism (n ≳ 5). The agreement between the two methods is good in the overlap…
The radiation damage produced by low-dose 80 keV Ni+ and W+ heavy-ion bombardment of Ni, Ni/Cr 8%, Ni/Cr 17%, Fe/Ni 10%/Cr 17% and a 321 austenitic stainless steel has been studied by means of transmission electron microscopy. In all materials small vacancy loops were observed, produced heterogeneously by the collapse…
Abstract Al-substituted goethites were prepared by rapid oxidation of mixed FeCl 2 -AlCl 3 solutions at pH 6.8 in the presence of CO 2 at 25°C. A combination of Al substitution and adsorption of CO 2 reduced crystal size (except for an increase at small additions of Al) and produced unusual thin, porous particles. Pro…