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 initial stages of oxidation of the Si(001)-2×1 surface have been studied using scanning tunneling microscopy and spectroscopy. Among the new sites generated by the exposure of this surface to O2 are 1.4 Å high bumps on top of the surface. Upon annealing the O2-exposed surface, or upon O2 exposure at an elevated te…
An investigation of subnanosecond switching of 119-microm radiation achieved by irradiating high-resistivity silicon wafers with 1.7-ns, 337-nm pulses from a nitrogen laser is presented. The experimental results are compared with a one-dimensional numerical multilayer model, which accounts for the generation, recombin…
Amorphous aluminum oxide thin films were prepared on glass and silicon (100) substrates by a low-temperature atmospheric-pressure chemical vapor deposition method. The raw material was aluminum acetylacetonate, which is nontoxic and easy to handle. The substrate temperature could be lowered to 250 °C by the thermal de…
It is demonstrated that photoluminescent porous Si (PS) layers exhibit definitely visible electroluminescence (EL). The PS layers were formed by anodization of single-crystal nondegenerate p-type Si wafers in an HF solution. The experimental EL cells are of the form semitransparent metal/PS layer/p-type Si/Al electrod…
ZnO-SnO2 thin films are deposited by rf sputtering using a sintered oxide target. As-deposited films show different crystal structures of a hexagonal ZnO, a spinel type intermediate compound Zn2SnO4 or an amorphous by experimental conditions. The Zn2SnO4 films show higher than 80% transmissivity over the visible range…
The permanent dipole of the NO 2 radical and the relative displacement between the ions are considered about the ferroelectricity in NaNO 2 . In this case the possibility of the rotation of NO 2 can be explained as the mixed double rotations around the a -axis and the c -axis. The IC phase between the ferroelectric an…
Abstract A stream of unheated crossflow air has been used to make finer melt‐blown fibers. Not only are smaller average fiber diameters obtained, but the variation in fiber diameter is smaller. The use of this technique can allow the production of melt‐blown nonwovens, which have finer fibers and more uniform webs. Si…
The lattice cluster theory is applied to explain the observed strong concentration dependence of the apparent radius of gyration and the correlation length in polystyrene/poly(vinylmethylether) blends. The analysis emphasizes the importance of using a theory that properly describes blend compressibility, monomer molec…
Layered dichalcogenide semiconductors (LS) are studied intensively for photovoltaic applications. It is generally accepted that the smooth van der Waals face (\ensuremath{\perp}c) is most suitable for this purpose. Recombination centers have been associated with surface steps (exposing \ensuremath{\parallel}c facets)…
Ab initio pseudopotential calculations of the crystal structure, electronic structure, cohesive energy, and formation enthalpy of ${\mathrm{B}}_{12}$${\mathrm{As}}_{2}$ have been calculated using a large plane-wave expansion. We compare the bonding with that of ${\mathrm{B}}_{12}$, ${\mathrm{B}}_{13}$${\mathrm{C}}_{2}…
The electron-beam specular reflectivity of an InAs(001) surface was quantitatively measured as current through an electrode at several substrate temperatures. The reflectivity changes discontinuously at the reconstruction transition from As-stable (2\ifmmode\times\else\texttimes\fi{}4) to In-stable (4\ifmmode\times\el…
The electronic band structure of a hypothetical compound ${\mathrm{BeCN}}_{2}$ in the chalcopyrite structure has been calculated using the linear-muffin-tin-orbital method and the local-density approximation (LDA) for exchange and correlation. The calculations predict a lattice constant of 3.67 A\r{}, a bulk modulus o…
In the recent paper by Laikhtman and Solomon [Phys. Rev. B 41, 9921 (1990)] a theoretical description of the mutual-drag effect of two- and three-dimensional electron gases in heterostructures was given. In this paper a different approach based upon the concept of collective collisions between electrons is suggested.…
We report the nonlinear behavior of the CuO-concentration-dependent density (\ensuremath{\rho}), mean molar oxygen volume (${\mathit{V}}_{0}^{\mathrm{*}}$), and electrical conductivities (both ac and dc) of the ${\mathrm{Bi}}_{4}$${\mathrm{Sr}}_{3}$${\mathrm{Ca}}_{3}$${\mathrm{Cu}}_{\mathit{y}}$${\mathrm{O}}_{\mathit{…
We generalize previous work [J. Chem. Phys. 94, 597 (1991)] on an alternative to the Ewald method for the numerical simulations of Coulomb fluids. This new method consists in using as a simulation cell the three-dimensional surface of a four-dimensional sphere, or hypersphere. Here, we consider the case of polar fluid…
Abstract Allylamine (CH 2 CHCH 2 NH 2 ) was polymerized through rf generated plasma at varying powers and times. Chemical groups and elemental compositions in the polymers were studied using ESCA and infrared spectroscopy. It was observed that plasma derived polymers contained a significant number of primary amines…
A rapid thermal annealing (RTA) technique has been employed to process lead zirconate titanate (PZT) films prepared by reactive magnetron sputtering. The films were fabricated by dc sputtering a multielement metal target in an oxygen ambient at a substrate temperature of 200 °C. A subsequent postdeposition RTA at 600…
Cristallisation dans I4/mmm avec a=7.0515, c=11.1503A, Z=2; affinement jusqu'a R=0.0300. La structure contient des groupements cycliques [Si 4 O 12 ] 8- isoles avec Si-O(1)=1.570 et Si-O(2)=1.602A. La coordination carree du cuivre s'effectue avec quatre atomes O(1) et Cu-O(1)=1.925A. L'ion baryum est environne de huit…
The electron paramagnetic resonance (EPR) in a single crystal of gadolinium–gallium–garnet has been studied with the aim of understanding the behavior of EPR in systems with large dipolar and small exchange fields, such as encountered in many of the rare-earth based high Tc superconducting compounds. Only one wide lin…
Solidification of selected Mn-Al-C alloys during containerless levitation and rapid quenching has yielded the first report for a ferromagnetic metastable τ (L10) phase formed directly from the melt. Complete solidification to τ phase was interrupted by the competitive evolution of an equilibrium ε phase during recales…