Materials Literature
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Abstract Sesquioxidic soil clays from Oxisols in South Africa, Australia and Brazil, and two clays from Andosols in Japan and New Zealand, were investigated by selective dissolution techniques. Acid ammonium oxalate (pH 3) was found to be superior to currently popular alkaline reagents for extracting amorphous alumino…
Gd(IO3)3, type I, crystallizes in the monoclinic system with space group P21/a and four formulas in the unit cell. The lattice constants, at 297 °K, are a=13.4365(9), b=8.5226(5), c=7.1356(5) Å and β=99.717(7) ° for λCuKα1=1.540598 Å. A total of 5012 independent reflections were measured on a CAD-4 diffractometer, usi…
Abstract A reliable method, utilizing a fluoride ion-selective electrode, is described for the determination of fluoride in clays and shales. Interference by aluminum and iron is minimal. The reproducibility of the method is about ±5% at different levels of fluoride concentration. Data are presented for various clay m…
Absorption and magnetic circular dichroism (MCD) spectra are reported for the 7 F 6→5 D 4 transition of Tb3+ in crystalline Cs2NaTbCl6. These spectra are interpreted in terms of a crystal-field analysis of Tb3+ situated in an octahedral site with six Cl- nearest neighbours. The extensive, well-resolved vibrational str…
The new Fe-Cr-Mo ferritic stainless steels are reviewed with an emphasis on corrosion behavior. The properties of commercial steels are outlined showing how these alloys can be divided into general purpose (18Cr-2Mo), moderately severe service (26Cr-1Mo), and premium service (29Cr-4Mo) materials. The stress corrosion…
The spontaneous polarization Ps of single-domain orthorhombic KNbO3 has been measured with the Camlibel pulse method. A new value of Ps=0.41±0.02 C/m2, which is about 30% larger than the result obtained in hysteresis measurements, has been observed. The temperature dependence of the pyroelectric coeffficient has been…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectra of inorganic molecules. 18. Observations on sulfur 2p binding energies in transition metal complexes of sulfur-containing ligandsStephen A. Best, Patrick Brant, Robert D. Feltham, Thomas B. Rauchfuss, D. Max Roundhill, and Richard A. WaltonCite th…
The dynamics of a particle attracted by a magnetized wire is studied for nonvanishing gravitational forces and a broad range of Stokes number K. The Newtonian equation of motion for the particle is integrated for 10−2⩽K⩽102, a range which includes conditions where the particle inertia cannot be ignored. Families of tr…
Abstract A simple way of determining the helix screw sense of a cholesteric phase using the Grandjean-Cano method is described. The helix pitch as well as its sense is investigated for ten cholesteric phases, induced by mesogenic chiral compounds in the nematic isomere mixture of 4-methoxy-4′-n-butylazoxybenzene (Nem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the dimolybdate ion, Mo2O72-V. W. Day, M. F. Fredrich, W. G. Klemperer, and W. ShumCite this: J. Am. Chem. Soc. 1977, 99, 18, 6146–6148Publication Date (Print):August 1, 1977Publication History Published online1 May 2002Published inissue 1 A…
INTRODUCTION 11.MODEL SYSTEMS (a) Intermolecular cases (b) Intramolecular cases 111.FLAVOPROTEMS (a) Tyrosyl cases (b) Tryptophanyl cases (c) Other cases IV.CONCLUSIONS
A completely general theory is presented which can be used to describe both anion and cation adsorption on amphoteric oxide surfaces. It takes account of the fact that both the surfaces and adsorbing species are charged and that the surfaces change their charge when ionic adsorption takes place. The theory is applicab…
The Poincaré sphere representation, a geometrical method for solving problems involving the propagation of polarized light through birefringent and optically active media, is applied to several electrooptic liquid crystal problems. The emphasis is on the twisted nematic case, for which the quiescent state solution was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetection and characterization of the long-postulated iron-dioxygen-iron intermediate in the autoxidation of ferrous porphyrinsDer-Hang Chin, John Del Gaudio, Gerd N. La Mar, and Alan L. BalchCite this: J. Am. Chem. Soc. 1977, 99, 16, 5486–5488Publication Date (Print):August…
In a preliminary study of the enzyme-polymer interactions, the role of 15 enzymes in the in vitro hydrolysis of polyglycolic acid has been investigated. Carboxypeptidase A, alpha-chymotrypsin, clostridiopeptidase A and ficin increase the rate of hydrolysis of this synthetic polymer, illustrating the ability of enzymes…
Ionic and electronic conductivity has been measured in and . Ionic conductivity was measured by using as a blocking electrode for electronic conduction. Transference numbers were confirmed by cells of the type . Ionic conductivities were for and , respectively, at room temperature. The conductivity of increases abrupt…
The authors performed optical measurements consisting of near normal incidence reflectance (2-11 eV) and multiangle reflectance measurements (11-15 eV) on gallium films condensed on cooled glass substrates in a vacuum of 2*10 -10 Torr. Optical constants were determined with the help of a Kramers-Kronig analysis of the…
The ESR spectra of single crystals and amorphous thin films of W${\mathrm{O}}_{3}$ have been measured in the temperature range 77-300\ifmmode^\circ\else\textdegree\fi{}K. In the case of single crystal the observed resonance lines were identified as due to ${\mathrm{Mo}}^{5+}$ ions. The observed values are: ${g}_{\math…
Normal incidence measurements of single-layer gradient refractive-index antireflection films, produced by a chemical etch-leach process on glass sensitized by a phase-separating heat treatment, indicate very low reflection over a broad wavelength regime, 0.35–2.5 μm. First-surface measurements of the reflectance of th…
Many of the physical properties of crystalline solids depend on the presence of native or foreign point def ects. In pure compound crystals the native defects are atoms missing from lattice sites where, according to the crystal structure, atoms should be (vacancies); atoms present at sites where atoms should not be (i…