Materials Literature
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Abstract For the first time the anisotropy of reflectivity of polarized infrared light of p‐(Bi 1– x Sb x ) 2 Te 3 single crystals (0.5 ≦ x ≦ 1) is given in the wave number range of 300 to 4000 cm −1 . In addition to the excitation of free carriers in the reflection spectra of the mixed crystals also interband excitat…
We report a study of the relative reactivity of the common amino acids and of their residues in lysozyme with osmium tetroxide, the osmium tetroxide-pyridine reagent, and with the oxo-osmium(VI)-pyridine reagent. With free amino acids, the osmium(VIII) reagents are most reactive with Met, Cys, His, Thr, Ser, Trp, Lys,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTENDOR study of oxovanadium(IV) tetraphenylporphyrin randomly oriented in rigid solutionCharles F. Mulks and Hans Van WilligenCite this: J. Phys. Chem. 1981, 85, 9, 1220–1224Publication Date (Print):April 1, 1981Publication History Published online1 May 2002Published inissue…
The zero-field susceptibilities parallel and perpendicular to the tetragonal axis of NiCl2⋅4SC(NH2)2 have been measured between 1.2 and 30 K and fitted to the usual spin Hamiltonian. The resulting parameters are D/kB = 7.6±0.4 K, z0J/kB = −4.5±0.3 K, g∥ = 2.26±0.03 and g⊥ = 2.34±0.03. The susceptibility has also been…
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,…