Materials Literature
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Films of amorphous ${\mathrm{GeSe}}_{2}$, ${\mathrm{GeSe}}_{3}$, and ${\mathrm{GeS}}_{2}$ have been deposited at various angles of incidence onto appropriate substrates and the nature of the photoinduced oxidation (as monitored by the Ge-O peak at \ensuremath{\sim}800 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ in the…
The dependence of electronic conductivity upon the length (L) of conjugated segments is calculated for conducting polymers for which (1) interruptions in conjugation on neighboring chains are uncorrelated, (2) all chains are equivalent, and (3) intersegment hopping controls chain-direction conductivity. If interchain…
In this article we compare the experimental O 1s x-ray-absorption (XAS) spectrum of CuO with the results of an augmented-localized-spherical-wave (ALSW) calculation with an extended basis set. By extending the basis set in the calculation, we obtain a good overall agreement between experiment and the O 2p unoccupied d…
Electron-spin-resonance studies have been made of the kinetics of \ensuremath{\gamma}-ray-induced defect creation in samples of undensified, low-OH-concentration (<5 ppm) and high-OH-concentration (>1200 ppm) silica and in samples plastically densified by 12.3% (low OH) and 13.8% (high OH). For the oxygen-vacanc…
The temperature and frequency dependence of electrical conductivity (${\ensuremath{\sigma}}_{\mathrm{dc}}$) and the electrical modulus of sodium, rubidium, and Na-Rb mixed alkali germanate and aluminogermanate glasses have been determined for varying alkali concentrations, and [Al]/[Ge] and [Na]/[Rb] ratios. In a few…
Magnetic susceptibility measurements conducted by the superconducting quantum-interference device (SQUID) technique in the temperature range 6--300 K on electrochemically synthesized polypyrrole and polythiophene doped with tetrafluoroborate (${\mathrm{BF}}_{4}^{\mathrm{\ensuremath{-}}}$) are reported. The temperature…
By performing the local-density-functional band calculations, we analyzed the phase stability of nine binary-alloy systems which are composed of Ni, Pd, or Pt as one element and Cu, Ag, or Au as the other. Most of the qualitative aspects of the phase diagrams of these systems are reproduced successfully. It is pointed…
With use of the molecular-dynamics technique, the structural and dynamical correlations in molten and vitreous ${\mathrm{GeSe}}_{2}$ are investigated with an effective interionic potential which consists of Coulomb, charge-dipole, and steric interactions. It is found that the short-range order is dominated by Ge(${\ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectroscopyRobin L. GarrellCite this: Anal. Chem. 1989, 61, 6, 401A–411APublication Date (Print):March 15, 1989Publication History Published online22 September 2008Published inissue 15 March 1989https://pubs.acs.org/doi/10.1021/ac00181a001https://doi.…
The relationship between geometry and physical properties of aperiodic structures is investigated by considering the example of the tight-binding Schr\"odinger equation in one dimension, where the site potentials are given by an arbitrary deterministic aperiodic sequence. In a perturbative analysis of the integrated d…
We report exact results for two and three dimensional directed models of polymer chain adsorption–desorption transition in the presence of attracting substrate. A number of properties of this transition are evaluated explicitly. These include the phase diagram, the adsorption fraction and the monomer-density profile.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSURFACE-ENHANCED RAMAN SPECTROSCOPYCite this: Anal. Chem. 1989, 61, 6, 401A–411APublication Date (Print):March 15, 1989Publication History Published online30 May 2012Published inissue 15 March 1989https://doi.org/10.1021/ac00181a715RIGHTS & PERMISSIONSArticle Views327Altmetr…
Substantial changes in the radial distribution function of amorphous Si films have been observed in neutron-diffraction studies. The spectra indicate changes in short-range order associated with an \ensuremath{\sim}11% modification in the bond-angle distribution width. The results allow the first direct comparison of…
Tin-doped indium oxide (ITO) films have been deposited by RF sputtering an oxide target onto substrates held at different distances from the target surface. The deposition rate is constant up to a target-to-substrate distance of 3.5 cm and decreases with further increase in substrate distance, this distance being asso…
ABSTRACT A series of tests to describe the effect of numerous holes in casing on the mechanical crush resistance has been run in casing and in L-80 steel tube models. The tests were run with big holes and normal hole sizes for perforations in phasings of 0°, 180°, 120°, 90°, and 60°. Shot density was varied in the mod…
Very regularly coiled spring-like fibers of Si3N4 have been obtained from a gas mixture of Si2Cl6, NH3, and H2 at 1200 °C on a graphite substrate on which an iron impurity was painted. The spring-like fibers were amorphous Si3N4 with a circular cross section having a 0.5–1 μm thickness, 3–5 μm coil pitch, 10–15 μm coi…
A high-resolution neutron scattering study of ${\mathrm{Ni}}_{62.5}$${\mathrm{Al}}_{37.5}$ shows that the martensitic transformation is associated with a homogeneous distortion and a nearly seven-fold modulation of the cubic lattice which is predicted by an observed phonon anomaly above ${T}_{M}$. In the low-temperatu…
The resonance-enchanced multiphoton ionization (REMPI) technique was employed for detection of gas phase atomic hydrogen in the filament-asisted diamond growth environment. The H atom REMPI signal varied significantly with the reactant CH4/H2 fraction as well as with the filament temperature. We interpret these observ…
The magnetic field (H) dependences of the ultrasonic attenuation Δα(H) and the relative velocity ΔV(H) responses of 0.6 GHz Rayleigh-mode surface acoustic wave pulses in vacuum-evaporated, uniaxially anisotropic nickel thin films were measured and correlated with changes in the sample’s dc magnetoresistance Δρ(H). Rec…
In this Letter we study the evolution of a two-dimensional soap froth. We present experimental evidence for the existence of a limiting scale-invariant distribution of the number of sides in a bulk froth at long times. We also discuss the apparent failure of the hypothesis that all internal angles in a froth are 120\i…