Materials Literature
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The effect of rf power and substrate temperature Ts on the optical, electrical, and structural properties of a-Si1−xCx:H alloy films deposited in the new hot-plasma-box glow-discharge reactor are reported. The rate of deposition as well as the total fraction x of the carbon incorporated in the alloy films were found t…
Time-of-flight photocurrent measurements of 1,1-bis(di-4-tolylaminophenyl)cyclohexane doped bisphenol-A-polycarbonate show dispersive features at low temperatures. Within the nondispersive regime, transients show anomalously broad tails of universal shape. Their relative width is in quantitative accord with Monte Carl…
Abstract Three‐component emulsion polymer systems constitute an overall four‐component system from a morphological viewpoint. The aqueous phase is always the continuous phase within which 22 distinct and thermodynamically stable particle morphologies may exist. Six uniquely different categories of particles compose th…
Theoretical expressions are presented, at various levels of approximation, for the density of states <ρu(ω)≳ of harmonic modes with imaginary frequencies in liquids; these are also referred to as unstable modes. The relation between the frequency integral of <ρu(ω)≳, which is the fraction of unstable mod…
The magnetoresistance (MR) effects of La0.72Ca0.25MnOz (LCMO) magnetic films and LCMO/YBa2Cu3Oy (YBCO)/LCMO trilayered films were studied. The LCMO films have an MR ratio of −4% when applying 1 T at 77 K and this value is independent of the film thickness from 1500 to 4500 Å. In contrast to that, the MR ratio for LCMO…
Abstract Growth of diamond at conditions where it is the metastable phase can be achieved by various chemical vapour deposition methods. Atomic hydrogen plays a major role in mediating rates and in maintaining a proper surface for growth. Low molecular weight hydrocarbon species (e.g. CH3 and C2Hx are believed to be r…
We report on band-gap luminescence in strain-symmetrized, (Si${)}_{\mathit{m}}$/(Ge${)}_{\mathit{n}}$ superlattices grown on a step-graded, alloy buffer with a reduced dislocation density, using Sb as a surfactant. The luminescence efficiency for a (Si${)}_{9}$/(Ge${)}_{6}$ and (Si${)}_{6}$/(Ge${)}_{4}$ superlattice i…
The unique molecular conductors with p\ensuremath{\pi}-d mixing band structures (${\mathit{R}}_{1}$,${\mathit{R}}_{2\mathrm{\ensuremath{-}}}$N,N'-dicyanoquinonediimine${)}_{2}$Cu [(${\mathit{R}}_{1}$,${\mathit{R}}_{2\mathrm{\ensuremath{-}}}$DCNQI${)}_{2}$Cu] (${\mathit{R}}_{1}$,${\mathit{R}}_{2}$=${\mathrm{CH}}_{3}$,$…
Copper overlayers with thicknesses up to several tens of angstroms have been vapor deposited at various substrate temperatures onto rutile ${\mathrm{TiO}}_{2}$(110) surfaces that have different defect concentrations. The metal films have been studied by means of ${\mathrm{He}}^{+}$ low-energy ion scattering, x-ray pho…
Absorption spectra of Tm3+ ions in yttrium scandium aluminum garnet are reported between 1.9 and 0.25 μm at 4 K. Laser-excited fluorescence was observed at 4 K from Tm3+(4f12) multiplet manifolds 1D2, 1G4, 3F2, and 3H4 to the ground-state manifold 3H6. Emission from 1D2 and 1G4 also includes transitions to Stark level…
I-U characteristics measured in ${\mathrm{TlGaTe}}_{2}$ single crystals consist of two regimes: a linear one at low current densities and a nonlinear one at higher current densities. In the nonlinear part [negative-differential-resistance (NDR) region] of the curves, a considerable increase of the temperature of the s…
The critical behavior of pinned charge-density waves (CDW's) is studied as the threshold for sliding is approached. Using the Fukuyama-Lee-Rice Hamiltonian with relaxational dynamics, the polarization and linear response are calculated numerically. Analytic bounds on the subthreshold motion are used to develop fast nu…
The correlation between free-exciton and bound-exciton recombination has been investigated by cathodoluminescence in high-quality and impurity-controlled chemical-vapor-deposited (CVD) diamond films. The films are formed by [CO(5%)]/[${\mathrm{H}}_{2}$] using microwave-plasma CVD and are doped with ${\mathrm{B}}_{2}$$…
Using a measure of the asymmetry of the valence charge distribution in ${\mathit{A}}^{\mathit{N}}$${\mathit{B}}^{8\mathrm{\ensuremath{-}}\mathit{N}}$ compounds, a mapping to Phillips's ionicity scale is achieved.
We report a systematic study of the first and second hyperpolarizabilities of several small molecules at a consistent level of theory and basis sets. Coupled cluster (CC) methods for correlation, analytical high-order time dependent Hartree–Fock (TDHF) theory for dispersion effects, and polarizability-consistent basis…
The authors report time-resolved photoluminescence spectroscopy of highly porous silicon. Their results show that the luminescence is due to localized quantum-confined excitons in undulating crystalline silicon wires. The resonantly excited photoluminescence spectrum exhibits satellite structure due to momentum-conser…
Abstract The principal chemical mechanisms relevant to the growth of diamond from gaseous hydrogen and hydrocarbon species are presented. The kinetic processes occurring during the activation and transport of the gaseous species to the growing surface are described, with the key processes being the generation and subs…
The spontaneous macroscopic polarization of perovskite ${\mathrm{KNbO}}_{3}$ is calculated as a Berry's phase using the Bloch functions of the tetragonal crystal. The result P=0.35 C/${\mathrm{m}}^{2}$ supports the measured value 0.37 C/${\mathrm{m}}^{2}$ and implies that earlier data from hysteresis loops are too low…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe electrochemical activity of boron-doped polycrystalline diamond thin film electrodesGreg M. Swain and Rajeshuni. RameshamCite this: Anal. Chem. 1993, 65, 4, 345–351Publication Date (Print):February 15, 1993Publication History Published online1 May 2002Published inissue 1…
The parametrization and optical properties such as absorption, photoluminescence (at 300 K and 77 K) and lifetimes of the lasing transition ( 5 D 0 to 7 F 2 ) of the EuF 3 (1 M%)-doped heavy metal fluoride glass (HMFG) systems of: 48ZrF 4 +24BaF 2 +7AlF 3 +20RF where RF=LiF, NaF and KF are studied. These Eu 3+ glasses…