Materials Literature
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Abstract Transmission electron microscopic (TEM) examination of the <0·1- µ m fraction of montmorillonite and regularly interstratified illite-smectite (I-S) shows that these clays, when dried from suspension, consist primarily of particles 10 Å and 20 Å thick respectively. However, X-ray diffraction (XRD) examinat…
Abstract Fixation of reaction partners at appropriate distances from one another is a structural prerequisite for vectorial reactions and reaction sequences. In biological systems (e.g. the photosynthetically active thylakoid membrane or membrane receptors) the positions of the reaction centers are fixed by membrane‐p…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. Kléman, N. David Mermin; Points, Lines, and Walls in Liquid Crystals, Magnetic Systems, and Va…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of sodium aqua(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetato)europate(III) tetrahydrate Na+(EuDOTA.H2O)-.4H2O, and its relevance to NMR studies of the conformational behavior of the lanthanide complexes formed by the macrocyclic ligand…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReinterpretation of five recent crystal structures of heteropoly and isopoly complexes: divanadodecamolybdophosphate, trivanadoenneamolybdophosphate, ".gamma.-dodecatungstophosphate", the dodecamolybdate-dodecamolybdomolybdate blue complex, and dihydrogen decavanadateHoward…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of high polymers from substituted acetylenes: exploitation of molybdenum- and tungsten-based catalystsToshio Masuda and Toshinobu HigashimuraCite this: Acc. Chem. Res. 1984, 17, 2, 51–56Publication Date (Print):February 1, 1984Publication History Published online1…
The real and imaginary parts, n and k, of the complex index of refraction of a hydrogenated amorphous carbon (a-C:H) film have been determined for photon energies between 1.45 and 4.9 eV from measurements of reflectance R and transmittance T. Both n and k, and consequently ε1 and ε2 (the real and imaginary parts of th…
It has been observed over the past 15 years that experimental frequency-dependent dielectric constants of broad classes of materials including polymeric systems and glasses may be interpreted in terms of the Williams-Watts polarization decay function [Formula: see text] The exponent alpha and the time constant T depen…
The birefringence of KDP has been measured as a function of temperature, pressure and d.c. electric field, in order to study the phase diagram in the tricritical region. The results are interpreted using a Landau-type theory.
<div class="htmlview paragraph">A hydrogen engine-fuel system is being developed as an alternative for powering underground mining machinery. A diesel was converted to a spark-ignited hydrogen engine and operated with a metal hydride, solid-state hydrogen storage system.</div> <div class="htmlview parag…
The ultrastructure, histochemistry and X-ray microanalysis of the metal-containing blood cells in three species of oyster, Ostrea edulis, Ostrea angasi and Crassostrea gigas are described. Granular cells containing both copper (up to 400 mM) and zinc (up to 1 M) are present in all three species. In addition, Ostrea ed…
A frequency shift of a Raman peak is observed in 2H-MoS 2 , when the exciting laser frequency ω i is tuned across the A and B excitonic levels. The frequency shift decreases as ω i increases. It can be explained as due to a resonant two-phonon Raman process of the successive emission of a dispersive longitudinal quasi…
Electrical discharge and breakdown in low-mobility insulating liquids and solids involve the creation of low-density domains or channels in the bulk by carrier injection from electrical contacts and subsequently dissociative trapping and recombination as a necessary prelude. Internal discharge such as electrical treei…
Many aquatic plants and animals spend part of their lives anchored to the substratum as water flows by. There are a number of mechanisms by which such sessile organisms can affect the magnitude of the flow-induced forces they encounter, as well as the distribution and magnitude of the mechanical stresses in their bodi…
It is pointed out that isotope fractionation as a result of chemical reactions is due to the small zero-point energy differences between reactants and products of isotopically distinct species. Only at temperatures near absolute zero does this energy difference become significant. Favorable conditions for isotope frac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational investigations of polyoxometalates. 3. Isomerism in molybdenum(VI) and tungsten(VI) compounds related to the Keggin structureRene Thouvenot, Michel Fournier, Raymonde Franck, and Claude Rocchiccioli-DeltcheffCite this: Inorg. Chem. 1984, 23, 5, 598–605Publication…
Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation Rustum Roy, H. J. Leamy, C. W. White, E. N. Kaufmann, R. L. Schwoebel, K. C. Taylor, C. J. Northrup; Materials Research Society. Physics Today 1 February 1984; 37 (2): 87–89. https://doi.org/10.1063/1.2916117…
The temperature dependence of the infrared reflectivity spectra in KNbO 3 is reported for the cubic, tetragonal and orthorhombic phases in a temperature range extending from 300 to 1200K. Spectra have been fitted with a model based on the factorised form of the dielectric function. The temperature dependence of the mo…
The phase diagram of a system of hard ellipsoids of revolution was investigated by means of constant-pressure Monte Carlo simulation. Prolate as well as oblate ellipsoids were considered. The results for the isotherms of the system at several different values of the length-to-breadth ratio are presented. Four differen…
The transition between the incommensurate plane-wave modulation regime and the multisoliton lattice modulation regime is studied by 87 Rb quadrupole perturbed nuclear magnetic resonance in Rb 2 ZnCl 4 . Both phase and amplitude solitons are taken into account in comparing the experimental and theoretical lineshapes an…