Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXPS studies of solvated metal atom dispersed (SMAD) catalysts. Evidence for layered cobalt-manganese particles on alumina and silicaBeng Jit Tan, Kenneth J. Klabunde, and Peter M. A. SherwoodCite this: J. Am. Chem. Soc. 1991, 113, 3, 855–861Publication Date (Print):January 1…
Basic Principles of Chemical Bonding. Chemical Reactions in the Gas Phase and in Simple Solvent Models. Chemical Reaction in All--Atom Solvent Models. Potential Surfaces and Simulations of Macromolecules. Modeling Reactions in Enzymes: An Introduction. General Acid Catalysis and Electrostatic Stabilization in the Cata…
Ceramic nanocomposites can be divided into three categories: intergranular nanocomposite, intergranular nanocomposite and nano/nano composite. The intra- and intergranular nanocomposites were found to show the two to five times higher toughness and strength at room temperature than those of monolithic materials. The h…
The ultraviolet–visible absorption spectra are given for 10 nm diameter colloidal particles of 52 of the metallic elements, calculated from the optical constants of the metals by means of Mie theory. For most of the elements the spectra cover the range 200–900 nm. Well resolved absorption bands are observed for colloi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanometer-sized semiconductor clusters: materials synthesis, quantum size effects, and photophysical propertiesYing Wang and N. HerronCite this: J. Phys. Chem. 1991, 95, 2, 525–532Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published…
Abstract Inorganic metal–oxygen cluster anions form a class of compounds that is unique in its topological and electronic versatility and is important in several disciplines. Names such as Berzelius , Werner , and Pauling appear in the early literature of the field. These clusters (so‐called isopoly‐ and heteropolyani…
Volume 15 of Reviews in Mineralogy is written with two goals in mind. The first is to derive the 32 crystallographic point groups, the 14 Bravais lattice types and the 230 crystallographic space group types. The second is to develop the mathematical tools necessary for these derivations in such a manner as to lay the…
Volume 22 of Reviews in Mineralogy is a book exclusively devoted to three minerals: the Al2SiO5 polymorphs - andalusite, sillimanite, and kyanite. It covers a wide variety of topics that must be considered in the analysis of metamorphic systems and illustrates the fact that modern metamorphic petrology demands an awar…
A model assuming a non-continuous structure of glasses is established to interpret the inelastic neutron scattering and Raman scattering. The 'boson' peak in Raman scattering is related to the vibrational density of states 'excess'. These two related features are a result of vibrations localized in the blobs that comp…
The authors have formulated a polarized-orbital treatment of electron-atom scattering which includes dynamic distortion effects. Detailed formulae are given in terms of their previous formulation of the polarized-orbital method. Results for electron-helium scattering are presented and compared with various experimenta…
Using mechanical alloying and a subsequent two-step heat treatment we produced magnetically isotropic microcrystalline Sm2Fe17Nx samples with room-temperature coercivities up to 24 kA/cm (30 kOe). The remanence and the energy product are equivalent to similarly prepared Nd-Fe-B samples, but the properties at elevated…
A simple and accurate extended Jones matrix representation for the twisted nematic liquid-crystal display at the oblique incidence was obtained for the first time. The results obtained by this extended Jones matrix representation are quite close to those obtained by the faster 4×4 matrix method with spectrum averaging…
The authors propose a new method of series analysis in which the available series coefficients are fitted to an algebraic equation. Such a proposal restricts solutions to have algebraic singularities with rational critical exponents. The advantage of the method over the method of differential approximants is that in t…
Cellulose is synthesized by all higher plants as well as by a wide variety of other organisms. The amount of synthesis is enormous, making cellulose the most abundant biopolymer on earth (1 ) . Most native cellulose is found in cell walls in the form of structural micro - fib rils . Although considerable effort has go…
The crystal structure of perlialite from the Murun Massif, U.S.S.R. was determined and refined using synchrotron X-ray powder data. The framework type of this natural zeolite is the same as synthetic zeolite Linde-L. Extraframework cation and water oxygen position were located, and the locations and occupancies show l…
After cooling below 80 K a considerable amount of diffuse scattering is observed in Li, in addition to 9R and fcc Bragg reflections. The diffuse scattering localized on the [101] line of the 9R reciprocal lattice is modulated along this line indicating a short-range order in the stacking sequence of the close-packed p…
Raman measurements were carried out on Ge quantum dots from 6.1 to 15 nm in size embedded in SiO2 thin films. The samples were prepared by rf co-sputtering and post- annealing. In contrast to the amorphous-like broad spectra previously obtained for gas- evaporated Ge microcrystals of comparable sizes, relatively sharp…
Nanometer-size diamond particles formed on a silicon substrate by the hot-filament chemical vapor deposition method were examined by a high-resolution electron microscope. The particles developed well-faceted cuboctahedral habits. Examination of their morphologies and microstructures provides a wealth of information o…
The ionic polarizabilities in Pb(ZrxTi1−x)O3 compositions are calculated by the Clausius-Mossotti-Lorentz-Lorentz equation. The resultant gap of the polarizability appearing at the morphotropic phase boundary (MPB) composition suggests the phase transition boundary to be due to the electrostatic long-range dipole mome…
The fluorescence spectrum of tripositive americium in a fluorozirconate glass at low temperature has been measured. Six fluorescence lines were observed between 515 to 880 nm and identified as Am3+ transitions. Fluorescence decay measurements at 15 K are reported for transitions that originate from states 5D1′ (∼1.0 m…