Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Ta thin films were grown on Si(001) and polycrystalline Si substrates by plasma-enhanced atomic-layer deposition (PE-ALD) using TaCl5 and atomic hydrogen as precursors. The grown films have resistivity of 150–180 μm cm with a small Cl concentration between 0.5 and 2 at. %. The diffusion barrier properties were investi…
Factors affecting molar mass, molar mass distribution, end-groups, and kinetics control in polymerization of ϵ-caprolactone (CL) and L,L-dilactide (LA) initiated by covalent alkylmetal alkoxides, metal alkoxides, and metal carboxylates are discussed. First, an importance of the reliable molar mass measurements of the…
The results ofan assessment ofthe state of theartin the design and manufacturing of largecompositestructures are described. The focus of the assessment is on the use of polymeric matrix composite materials for large airframe structural components, such as thosein commercial and military aircraft and spacetransportatio…
We have studied the interaction of small Aun (n=1–3) particles with the defect-free (stoichiometric) and defected (partially reduced) TiO2 anatase (101) surface using density functional calculations within a slab geometry. On the stoichiometric surface, gold particles prefer anion sites and “standing” geometries, in a…
Up to 0.15 formula unit (f.u.) of U 4+ incorporated in the Zr site of zirconolite by firing CaU x Zr (1− x ) Ti 2 O 7 compositions in argon at 1400°C allows retention of the 2M polytype. Further U 4+ substitution for Zr, up to 0.4 f.u., produces the 4M polytype (containing ∼0.4 f.u. of U) plus the 2M polytype containi…
Abstract For both environmental and economic reasons, there is a continuing broad based interest in recycling of scrap rubber and development of recycling technologies. The use of post- industrial scrap is established as a systematic business. However, the disposal and reuse of scrap tires remains a serious environmen…
This article reviews the current state of research involving semiconductor quantum dots, provides a brief review of the theory behind their unique properties, and an introduction explaining the importance of quantum dot research. The characteristic shifting of the band gap energy with quantum dot size, as predicted fr…
Epitaxial PbZrxTi1−xO3 (PZT) films have been prepared by metalorganic chemical vapor deposition on SrTiO3 substrates. Two sets of films of thicknesses 50–100 and 700–1400 nm, containing 0%, 40%, 60%, and 100% Zr, were prepared and investigated. The refractive index n was determined by ellipsometry for the thin films a…
The recombination of electron-hole pairs injected in extended conjugated systems is modeled as a multi-pathway vibron-driven relaxation in monoexcited state-space. The computed triplet-to-singlet ratio of exciton formation times $r = τ_T/τ_S$ increases from 0.9 for a model dimer to 2.5 for a 32-unit chain, in excellen…
By Monte Carlo simulations of a soft ellipsoid model for liquid crystals, we study whether a layer of grafted liquid-crystalline chain molecules can induce tilt in a nematic fluid. The chains are fairly short (four monomers) and made of the same particles as the solvent. They are attached to a substrate which favors p…
Neutron scattering measurements on a bilayer manganite near optimal doping show that the short-range polaron correlations are completely dynamic at high T, but then freeze upon cooling to a temperature T(*) approximately equal 310 K. This glass transition suggests that the paramagnetic/insulating state arises from an…
We investigated the in-plane anisotropy on the resistivity and thermopower of Bi 2- x Pb x Sr 2 Co 2 O y single crystals, which have a misfit structure between the hexagonal CoO 2 layer and the rock salt Bi 2 Sr 2 O 4 layer. The resistivity and thermopower show significant anisotropy, which exceeds two at maximum. Thi…
An interpretation of the Raman spectra of monoclinic ZrO 2 and monoclinic HfO 2 is made by analyzing the results of the zirconia–hafnia substitution jointly with a lattice dynamical treatment of both structures. The Raman spectra of tetragonal ZrO 2 and tetragonal HfO 2 are also interpreted. Emphasis is put on their r…
Thin flakes of yttrium hydroxide agglomerated in a manner resembling houses of cards with aging at 10°C. The agglomerate then dissociated into fine yttria particles with calcination at >800°C. The particle size of the calcined powder increased appreciably as the calcination temperature increased. The shrinkage curv…
A concept to electrically control the scattering of light is introduced. The idea is to embed noble metal nanoparticles in an electro-optical material such as a liquid crystal in order to induce a spectral shift of the particle plasmon resonance by applying an electric field. Light scattering experiments on single gol…
Various π-conjugated polymers are accessible via organometallic polycondensation reactions mediated by organic transition-metal complexes. For example, Ni(0)-promoted dehalogenation polycondensation reactions of dihaloaromatic compounds, X-Ar-X, afford polyarylenes, —(Ar)n—. Pd-catalyzed polycondensations give poly(ar…
The influence of low concentration (1 mol %) Mg doping on the structural, microstructural, surface morphological, and dielectric properties of Ba1−xSrxTiO3 (BST) thin films has been measured and analyzed. The films were fabricated on MgO and Pt–Si substrates via the metalorganic solution deposition technique using car…
We have determined infrared molar absorptivities for water absorption bands in Fe-bearing and Fe-free andesitic glasses. Water dissolves in andesitic glasses as both hydroxyl groups and molecular water as observed in other silicate glasses. Concentrations of molecular water and hydroxyl species are a strong function o…
We evaluate, using exact general formulas, the flux-metric and magnetometric demagnetizing factors, N/sub f,m/, of a rectangular prism of dimensions 2a/spl times/2b/spl times/2c with susceptibility /spl chi/=0 and the demagnetizing factor, N, of an ellipsoid of semiaxes a, b. and c along the c axis. The results as fun…
For use as fuel cladding of liquid metal fast reactors, Fe-0.12C-9Cr-2W ODS martensitic steel claddings were developed by cold-rolling under the softened ferrite phase induced by slow cooling from austenite phase, subsequently by ferrite to austenite phase transformation to break up substantially elongated grains prod…