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。
The growth, microstructure, and electrochemical oxygen intercalation of c-axis ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4+\mathrm{\ensuremath{\delta}}}$ thin films on substrates with different lattice mismatch [${\mathrm{SrTiO}}_{3}$ (001) and ${\mathrm{SrLaAlO}}_{4}$ (001) substrates] are compared. Except for the absence…
According to theoretical predictions made in 1989–1990, carbon nitride can be even harder than diamond. Carbon nitride thin films may become a good competitor for diamondlike carbon, which possesses a high hardness, high wear resistance, and low friction coefficient. At present, there are only a few studies on the tri…
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 F. Beekmans, A. D. Gotsis, B. Norder; Transient and steady‐state rheological behavior of the ther…
Human fibroblasts cultured for 10 days in a collagen sponge migrated through the pores of the sponge and expressed a moderate mitotic activity, which stabilized after 10 days, and a high collagen and protein synthesis. Between 10 and 27 days, the newly synthesized collagen filled the pores of the sponge. This matrix a…
Carbon nitride thin films prepared by radio frequency reactive sputtering of graphite in pure nitrogen plasma have been characterized by x-ray photoelectron spectroscopy (XPS) for probing the chemical bonding in the films. The multiple binding energy values obtained for the C 1s and N 1s photoelectrons in the film sug…
The machining and subsequent annealing behavior of an Al 2 O 3 ‐SiC nanocomposite (A1 2 O 3 + 5 vol% 0.2 μm SiC particles) was compared to that of single‐phase A1 2 O 3 . The machining‐induced residual line force was determined by measuring the extent of elastic bending in thin disk specimens, and the surface roughnes…
The microstructures and age hardening behaviours of a series of Mg–Al–rare earth (RE) alloys that had been either pressure die cast or permanent mould cast were investigated by SEM and analytical TEM. Two types of phases, Al4MM and Al12Mg17, were found in the as cast alloys and no pseudoternary Mg–Al–RE phases were pr…
We have observed multiple electronic states in the presence of a magnetic field in the half-doped ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}\mathrm{Mn}{\mathrm{O}}_{3+\ensuremath{\delta}}$ system. The resistivity of each state differs from one another by at least one order of magnitude. Application of a magnetic field in…
By chemical liquid deposition in which an alkoxide with a carbon number of 4 or smaller was used as raw material, a Sr 0.7 Bi 2.3 Ta 2 O 9+α (SBTO) thin film was fabricated for use as a ferroelectric memory device for the purpose of decreasing the temperature of crystallization and improving surface morphology. The cr…
Abstract Individual but connected synthetic routes for the preparation of the all‐E ‐configured 2,5‐dipropoxy‐substituted oligo(1,4‐phenyleneethenylene)s 1a–g were developed. An increasing number of conjugated stilbene units from n = 1 to n = 11 led to a convergent bathochromic shift (Δλ = λ ∞ − λ 1 = 127 nm) in the U…
We report on the application, for the first time to our knowledge, of spectroscopic generalized ellipsometry to liquid crystal materials. We have measured the three normalized elements of the Jones transmission matrix t at various sample temperatures within the spectral range from 340 to 1700 nm (0.73 to 3.65 eV) on t…
In order to identify the origin of dielectric relaxation of Pt/Ba 1- x Sr x TiO 3 /Pt thin-film capacitors, effects of post-annealing in oxygen ambient on their electrical properties were investigated. From comparison of the electrical properties of as-deposited and post-annealed capacitors, it is concluded that elect…
Grazing-incidence specular and diffuse X-ray scattering has been performed on polished surfaces of the glass ceramic Zerodur (registered trademark of Schott Glaswerke, Mainz). Analysis using a distorted-wave Born approximation showed that satisfactory fits to the data could be obtained only if grading was included at…
The energies and dispersions of the image states and quantum well electronic states in layers of Xe and Kr on a Ag(111) substrate were determined by angle-resolved two-photon photoemission (ARTPPE). For Xe, we measured binding energies of unoccupied electronic states for 1–9 layers and their parallel dispersion out to…
The hydrogen storage properties of a novel Mg 2 Ni alloy powder prepared with a mechanical grinding method were investigated. This alloy powder was transformed to an amorphous‐like state by this treatment. As a result, an electrode of this alloy shows a large discharge capacity (750 mAh/g) which is 2.5 times higher th…
A new model is presented for the gas dynamics within a bubble at conditions that lead to the phenomenon of sonoluminescence. The spherically symmetric Navier–Stokes equations with variable properties are solved together with momentum and energy equations in the liquid. Calculations are presented for bubbles of argon,…
An effective electronic Hamiltonian for transition-metal oxide compounds is presented. For Mn oxides, the Hamiltonian contains spin-2 "spins" and spin-$\frac{3}{2}$ "holes" as degrees of freedom. The model is constructed from the Kondo-lattice Hamiltonian for mobile ${e}_{g}$ electrons and localized ${t}_{2g}$ spins,…
Polarization charges, which are assumed to be located on crystal surfaces and contribute to ultra low frequency dielectric relaxation, were investigated through thermally stimulated current (TSC) studies of perovskite titanates in both single crystal and polycrystalline forms. When the anodic sides of the poled single…
For several years, the polyurethanes industry has critically examined its products in order to meet all present, and possible future, US environmental regulations. Formulations have had to be adapted to new types of blowing agents in order to compare favourably with the thermal and fire performances previously achieve…
A detailed electrical investigation of oxidized porous silicon (OPS) has been undertaken, using metal oxide semiconductor capacitors. We demonstrate that the dielectric can provide good electrical isolation under moderate electric fields, exhibiting low leakage current, high resistivity, reasonably low interface state…