Materials Literature
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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…
Electron-paramagnetic-resonance and electron-nuclear-double-resonance (ENDOR) methods are used to identify the negatively charged state of the isolated vacancy in electron-irradiated synthetic diamond crystals. The ${\mathit{T}}_{\mathit{d}}$ symmetry is confirmed by determining the arrangement of both nearest neighbo…
The magnetotransport phenomenon is investigated in α-type crystals of (BEDT-TTF) 2 I 3 which are metallized by applying quasi-hydrostatic pressures. At liquid helium temperatures, a fairly large magnetoresistance which rises in very low field and saturates above 0.5 T is observed. The effect of the magnetic field of 1…
Abstract Tensile properties of isotactic polypropylene filled with particulate kaolin fillers were evaluated in the composition range 0–60 wt % kaolin. Tensile modulus increased with filler concentration while breaking elongation and tensile strength decreased. The modulus increase was attributed to the restriction on…
Multilayered thin-film circuits in microelectronic devices are confined in dielectrics for insulation between layers. The confinement produces mechanical stress in the circuit. During operation, the stress can enhance or retard electromigration. This interaction has been analyzed using thermodynamics of irreversible p…
The electronic structure of ${\mathrm{Li}}_{\mathit{x}}$${\mathrm{Ni}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$O has been investigated using x-ray photoemission spectroscopy (XPS), bremsstrahlung isochromat spectroscopy (BIS), and model-Hamiltonian cluster calculations. The measurements support the conclusion that the Li…
The electronic structure of ${\mathrm{SrFeO}}_{3}$ has been investigated by x-ray photoemission and ultraviolet photoemission spectroscopy. We find that the ground state consists of heavily mixed ${\mathit{d}}^{4}$ and ${\mathit{d}}^{5}$L states, reflecting the large covalency. The Fe 3s core-level splitting, together…
We use time-, wavelength-, temperature-, polarization-resolved luminescence to elucidate the nature of the absorbing and ‘‘band edge’’ luminescing states in 32 Å diameter wurtzite CdSe quantum crystallites. Time-resolved emission following picosecond size-selective resonant excitation of the lowest excited state shows…