Materials Literature
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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…
Abstract The surface of ultra‐high strength polyethylene (UHSPE) fibers was modified using allylamine plasma deposition to improve their adhesion to epoxy resins. Allylamine plasma polymerization was investigated at different power inputs and polymerization times. The adhesion of treated fibers to epoxy resin was stud…
We report here enhancement of nucleation and adhesion of diamond films on nondiamond substrates such as copper, stainless steel, and silicon substrates. The enhancement of nucleation is accomplished by pulsed laser irradiation which converts some of the amorphous carbon on the surface into the diamond phase or forms a…
Mn 3d states in ${\mathrm{Zn}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Mn}}_{\mathit{x}}$Y (Y=S,Se,Te) have been investigated using resonant synchrotron-radiation photoemission at the Mn 3p-3d threshold. We observe chemical trends due to anion substitution for the main Mn 3d photoemission feature at 3.5, 3.6, a…
Oriented single-crystalline thin films of NiO and ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$, and ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$/NiO superlattices have been grown on cleaved and polished substrates of MgO(001), using oxygen-plasma-assisted molecular-beam epitaxy. We report the growth mode and structural characteriza…
We report on high-resolution electron-energy-loss measurements of surface-plasmon losses on Ag(001) performed for crystal temperatures T in the range 100--400 K. Both the surface-plasmon frequency and linewidth are found to depend on T. The surface-plasmon frequency decreases with increasing T, nearly independently of…
Photoelectron spectroscopy reveals a striking correspondence between charge-density-wave-related phase transitions and modifications of the electronic structure in 1T-${\mathrm{TaS}}_{2}$. High-energy-resolution spectra indicate that the collapse of the Fermi surface is abrupt at the quasicommensurate-commensurate tra…