Materials Literature
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A study was made of the structure and magnetic properties of Fe-Co alloy films produced by dc magnetron sputtering at an oblique angle of incidence. The films obtained in this manner showed uniaxial magnetic anisotropy in the film plane, with an easy axis of magnetization perpendicular to the incident direction of the…
CdS microcrystals under weak confinement conditions embedded in a polyvinyl alcohol polymer film have been optically characterized by linear absorption and time-resolved luminescence spectroscopy. They are studied in the presence of an external electrical field at low and room temperature and different densities of ph…
We discuss the reorientation of a cylindrically symmetric probe in a biaxial orthorombic medium, such as a biaxial nematic. We write down and solve for the first time the rotational diffusion equation for a rod-like or disc-like uniaxial probe reorienting in a medium of biaxial symmetry. We calculate first and second…
Abstract A model based on the polymer solution theory of Flory and Rehner is presented for estimating the solubility of organic solvents in chemical protective clothing (CPC) polymers using three‐dimensional (3‐D) solubility parameters. Immersion test solubility values of 40 organic solvents in commercial Viton® glove…
Optical properties are reported for cationic K clusters incorporated into the \ensuremath{\alpha} cage of K-form LTA. The \ensuremath{\alpha} cage has an inside diameter of \ensuremath{\sim}11 \AA{} and is arrayed in a simple cubic structure. The loading density of potassium is systematically changed from dilute to sa…
The several processes required to achieve Er luminescence in Si are investigated. In particular, the role of Er-O interactions to obtain the incorporation of high Er concentrations, electrically and optically active, in crystalline Si is addressed. Multiple Er and O implants were performed on n-type (100) Si crystals…
The positions of sulfur atoms adsorbed on GaAs(111)A and GaAs(111)B surfaces are determined by x-ray standing-wave (XSW) triangulation studies. On the GaAs(111)A surface, which is Ga terminated, sulfur atoms are on top of the first-layer Ga atoms, at the so-called T sites. On the GaAs(111)B surface, which is As termin…
Direct observation of superplastic deformation in shear in a scanning electron microscope in Pb-62% Sn eutectic alloy at different microstructural levels were performed. The sliding of grains as an entity was observed. Such cooperative grain-boundary sliding proceeds by means of the sequential shear of grains along sh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermogravimetry/gas chromatography/mass spectrometry and thermogravimetry/gas chromatography/Fourier transform infrared spectroscopy: Novel hyphenated methods in thermal analysisWilliam H. McClennen, Richard M. Buchanan, Neil S. Arnold, Jacek P. Dworzanski, and Henk L. C. M…
We report multireference configuration-interaction calculations for the lowest potential energy surfaces of the B(2s22p 2P)...H2 van der Waals molecule. The degeneracy of the 2p orbital implies that there exist three adiabatic potential energy surfaces (two of A′ symmetry and one of A″ symmetry in Cs geometry) which b…
Probability distributions are evaluated for electromigration induced open failures in narrow, passivated interconnects with a near-bamboo grain structure. Void formation is initiated at the cathode ends of the polycrystalline line segments or ‘‘grain clusters.’’ If these clusters are longer than a critical size Lc, th…
Recent observation of efficient light emission from porous silicon has attracted much attention and renewed interests in the study of nonlinear optical properties of nanometer-sized quantum systems. In this paper, we study the third-order nonlinear optical susceptibility of semiconductor quantum wires. The quantum wir…
We show in this paper that measurements of charge-state distributions for 5--1600 eV Li, Na, and K scattered from a clean Cu(001) surface provide an excellent probe of the dynamics of atom-surface charge transfer. The neutralization probabilities, measured as a function of the perpendicular velocities of the scattered…
We report detailed measurements of the electrical resistivity, Seebeck coefficient, and differential scanning calorimetry across the metal-insulator (MI) transition ( T MI ≊205 K) of NdNiO 3 . As in the isostructural oxide PrNiO 3 , the transition is extremely hysteretic, consistent with the first-order character of t…
An expression for the electron-phonon coupling strength in fullerene nanotubules is derived within the tight-binding model. It is shown that the interaction of electrons with longitudinal acoustic phonons gives rise to intraband scattering but not to interband scattering; the reverse is true for interaction of electro…
A zero-field spontaneous relaxor-ferroelectric transition is reported in Pb(Sc0.5Ta0.5)O3 (PST). This behavior is different from that of other relaxors, where such transitions occur only under the field. A highly disordered PST that has the wide relaxation spectrum typical of relaxors is shown to transform spontaneous…
The spectral quantum efficiency in ReS2 heterodiodes was measured in the wavelength region between 600 and 850 nm. Anisotropy effects in the van der Waals plane were observed by means of linearly polarized light at normal incidence to the (001) plane of ReS2 single crystals. The anisotropy in quantum efficiency reache…
Electron-energy-loss spectroscopy has been used to identify microcrystalline diamond films produced by laser ablation of graphite. The production of the diamond phase results from varying the deposition geometry and parameters from those of an earlier configuration that produced diamondlike carbon films. A complete st…
Abstract The thermal degradation of poly( N ‐vinyl‐2‐pyrrolidone) (PVP) was studied by dynamic thermogravimetric analysis (TGA) in the range 200–600°C under nitrogen and oxygen atmospheres at various heating rates. The apparent activation energy of the degradative process was determined by the application of kinetic t…
We report on the optical response of size selected Ag2, Ag3, Au2, and Au3 embedded in argon matrices. Cluster samples were investigated in situ by excitation, fluorescence, and absorption spectroscopy. The spectra for the dimers are in agreement with previous measurements made on conventionally prepared matrices. Our…