Materials Literature
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The local structural order in chalcogenide network glasses is known to change markedly at two critical compositions, namely, the percolation and chemical thresholds. In the ${\mathrm{As}}_{\mathit{x}}$${\mathrm{Te}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ glassy system, both the thresholds coincide at the composition…
Detailed computer simulation results of several static and dynamical properties of water, obtained by using a realistic potential model proposed by Jorgensen et al., in the supercooled region, at densities well below the coexistence curve, are reported. We have analyzed the structural properties by evaluating the volu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical structure, optical resonance, and surface-enhanced Raman scattering of silver-island films on suspended polymer latex particlesPaula A. Schueler, Jeffrey T. Ives, Fern. DeLaCroix, William B. Lacy, Patricia A. Becker, Jianmin. Li, Karin D. Caldwell, Barney. Drake, an…
Experimental observation of the ground-state biexciton transition in ${\mathrm{CdS}}_{\mathit{x}}$${\mathrm{Se}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ quantum dots in glass is presented in a three-beam experiment, involving a probe, a pump, and a saturating laser pulse. The observed quantum-dot biexciton ground state…
We have investigated the electronic structure of well-characterized samples of ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{FeO}}_{3}$ (x=0.0--0.4) by x-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy, bremsstrahlung isochromat (BI) spectroscopy…
Abstract Three series of polyether polyurethaneurea (PEUU) elastomers based on poly(tetramethylene glycol) (PTMG, MW = 1000 or 2000), 4,4′‐diphenylmethane diisocyanate (MDI), and three kinds of diamine chain extenders, i.e., 4,4′‐diaminodiphenylmethane (DAM), m ‐phenylenediamine (MPD), and p ‐phenylenediamine (PPD) we…
Thin film reactions of Cu/Al multilayer films were investigated by differential scanning calorimetry and transmission electron microscopy. Sequential intermetallic compound formation was found in the temperature range from 300 to 620 K. With excess copper present in the as-deposited trilayer and multilayer films, the…
The temperature dependence of the thermoelectric power was investigated for the emeraldine salt form of polyaniline protonated with camphor sulfonic acid (PANI-CSA) and for blends of PANI-CSA with poly(methyl methacrylate) (PANI-CSA/PMMA). The thermoelectric power (S) of PANI-CSA increases linearly in proportion to th…
Abstract The amount of research on lignocellulosic/thermoplastic composites has increased dramatically. Little attention, however, has been directed towards the subject of crystallinity at the interface (interphase). Optical microscopy and differential scanning calorimetry were used in this work to study crystallinity…
First-order Raman scattering of polycrystalline ${\mathrm{Ge}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Si}}_{\mathit{x}}$ alloys is studied from T=300--900 K. The Raman shifts of the three optical phonons are modeled by considering thermal expansion and coupling to two phonons. The shift of the Si-Si mode near…
Ba and Sr ferrites are prepared by sol-gel technique with different Fe/Ba(Sr) ratios in the starting materials. Magnetization, coercive, and anisotropy field strength are determined depending on the heat treatment of the gel and the iron/barium(strontium) ratio in the starting material. A two-step heat treatment is us…
Recent progress in the processing of conducting polyaniline (PANI) protonated with functionalized sulfonic acids [such as camphor sulfonic acid (CSA)] has enabled the fabrication of high-quality, homogeneous films with excellent surface quality. We present measurements of the reflectivity of such PANI-CSA films over a…
An ideal superparaelectric is treated as an ensemble of independent, coherently polarizing regions, of linear dimension lambda , each of which behaves as a 'Devonshire ferroelectric', with transition temperature T 0 , and local polarization, P s approximately (T-T 0 ) 1 2/. For sufficiently small lambda , the directio…
Photoionization thresholds for silicon clusters in the size range Si2 to Si200 have been examined by laser photoionization with detection by reflectron time-of-flight mass spectrometry. Stimulated Raman scattering light of narrow bandwidth 193 nm radiation was used as the ionization light source down to 146 nm. A char…
Twin related domain formation is examined as a strain relaxation mechanism for a heteroepitaxial tetragonal film on a cubic substrate. Elastic relaxations are calculated for a single twin band in which the c axis of the tetragonal domains is either related by a 90° rotation about an axis in the plane of the film or by…
Cathodoluminescence (CL) spectroscopy was used to study exciton recombination at temperatures from 80 to 280 K in undoped and boron-doped diamond particles grown by hot-filament chemical vapor deposition. Spectral lines due to free and bound excitons were observed in the near-band-gap region, 4.6--5.5 eV. (The band ga…
We study both analytically and numerically phonon transmission fluctuations and localization in partially ordered superlattices with correlations among neighboring layers. In order to generate a sequence of layers with a varying degree of order we employ a model proposed by Hendricks and Teller as well as partially or…
Absolute cross sections for electron-impact dissociation of SiF 4 from threshold to 300 eV are presented for formation of the neutral radicals SiF 3 , SiF 2 , SiF and Si. This measurement was accomplished with threshold-ionization mass spectrometry in a dual electron-beam device. The threshold energy for dissociation…
The effect of electrode surface roughness on the breakdown potential in SF 6 , SF 6 -N 2 , and SF 6 -CO 2 has been measured and calculated using two surface-roughness models (a multi-ridge model and a single-needle-tip-protrusion model). The calculations are in reasonable agreement with the experimental results, indic…
Abstract Blends of polyimide isomers containing hexafluoroisopropylidene in the central moiety of the diamine residue have been studied. The isomers differed by having either a meta or a para linkage between the diamine and dianhydride residues. The miscibility of these materials was investigated by studying the glass…