Materials Literature
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A new family of homogeneous polyolefin polymers that exhibit unique molecular and rheological properties designated polyolefin elastomers (POEs) are characterized by a narrow molecular weight and high degrees of comonomer distribution. Because these copolymers are often elastomeric in nature, one of the uses for these…
We report a first principles theoretical study of the surface relaxation and lattice dynamics of the Cu(211) surface using the plane wave pseudopotential method. We find large atomic relaxations for the first several atomic layers near the step edges on this surface, and a substantial step-induced renormalization of t…
Organically modified aluminosilicate mesostructures were synthesized from two metal alkoxides with the use of poly(isoprene-b-ethyleneoxide) block copolymers (PI-b-PEO) as the structure-directing molecules. By increasing the fraction of the inorganic precursors with respect to the polymer, morphologies expected from t…
We develop an empirical potential for silicon which represents a considerable improvement over existing models in describing local bonding for bulk defects and disordered phases. The model consists of two- and three-body interactions with theoretically motivated functional forms that capture chemical and physical tren…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Article Crystal structure of Ce2O2.5S, an oxidized form of Ce2O2S, from neutron and X-ray powder diffraction was published on December 1, 1997 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 212, issue 1).
A thin-film structure consisting of a ferrite and a high- T c superconductor was used to investigate the effct of the transport current in the superconductor on the amplitude-frequency characteristic and dispersion of surface magnetostatic waves (MSWs) in a ferrite film. It was found that the nature of energy transfer…
The Z-scan technique is used to extract the real and imaginary third order nonlinear susceptibilities, Re<SUB>(chi</SUB> )<SUP>(3</SUP>) and Im<SUB>(chi</SUB> )<SUP>(3</SUP>), respectively. A series of Z scans were conducted at 590 nm (near one-photon resonance) on a cumulene-containing polymer, poly(p- phenylene-1,4-…
The effect of support on the noble metal catalysts for carbon monoxide and hydrocarbon oxidation was investigated. The reactions were performed under the stoichiometric and oxygen-deficient conditions. Under the stoichiometric point, the activities of the powder catalysts for CO and C 3 H 6 oxidation are in the order…
Article Crystal structure of trisodium dineodymium nonanitrate,Na3[Nd2(NO3)9] was published on December 1, 1997 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 212, issue 1).
A polystyrene–polyisoprene (PS–PI) diblock copolymer (10,000–50,000 g/mol) and a matched PS&ndashPI–PS triblock (10,000–100,000–10,000 g/mol) were employed to study the effect of chain architecture on the rheological response of ordered block copolymer melts. Both samples adopt hexagonal microstructures with PS cylind…
The microstructure of the weld heat affected zone (HAZ) of alloy 7075 was simulated using a Gleeble system. The corrosion behaviour of several locations in the weld HAZ was investigated by means of differential scanning calorimetry, electrochemical measurement in 3·5 wt-%NaCl solution, and exfoliation corrosion tests.…
The results of investigations of polarized Raman spectra in ZnSiF6⋅6H2O and NiSiF6⋅6D2O single crystals in the temperature range 2–300 K are presented. It is found that the crystals are orientationally ordered at low temperatures. The orientational disordering is described by a model in which the rotational motion of…
The 1H and 13C NMR spectra of glucodigifucoside and glucogitoroside, cardenolides isolated from Digitalis lanata leaves, were completely assigned with the aid of 2D homonuclear (COSY) and heteronuclear (HETCOR and HMQC) correlation spectra. © 1997 John Wiley & Sons, Ltd.
Abstract Yixunite and damiaoite were found in a cobalt‐ and copper–bearing platinum ore vein of a contact metasomatic deposit. The chief ore minerals are bornite, chalcopyrite, magnetite and carrollite. The platinum minerals include moncheite, sperrylite, daomanite, cobalt malanite and cooperite. Yixunite and damiaoit…
Article Luminescence Properties and Stability Constants of Curium(III) Complexes with Lacunary Heteropolyanions PW11O397- and SiW11O398- in Nitric Acid Solutions was published on December 1, 1997 in the journal Radiochimica Acta (volume 78, issue s1).
The internal friction and dynamic modulus in pure Cu with various purities were measured in the temperature range from 25 to 250 °C after deformation at room temperature. All the specimens showed a large decrease in modulus during primary recrystallization the temperatures of which were found to be about 30 K lower fo…
Source of material: Slow evaporation of a solution of stoichiometric quantities of lead(II) iodide and pyridinium iodide yields the title compound as yellow prisms. The title compound is another member of the large family of chain-perovskites. The anionic substructure consists of chains of face-sharing Pbl octahedra a…
A new method is provided for the calculation of Raman intensities. Atomic polarizabilities are used as parameters to reproduce the experimental intensities. The method was applied to an MgF2 signal crystal. It is shown that the use of anisotropic atomic polarizabilities allows the simulation of both the cell polarizab…
Article Crystal structure of a new modification of potassium tetrathioantimonate, ß-K3SbS4 was published on December 1, 1997 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 212, issue 1).