Materials Literature
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We report the first measurements of the optical functions of polycrystalline metal films throughout nucleation and growth. The dielectric function of aluminum, evaporated onto ${\mathrm{SiO}}_{2}$, was determined versus thickness d by real-time multichannel ellipsometry (1.3\ensuremath{\le}h\ensuremath{\nu}\ensuremath…
We consider the inclusive reaction pp\ensuremath{\rightarrow}\ensuremath{\Lambda}X in the fragmentation region and present a dynamical mechanism which leads to a fair description of all the basic features of the observed \ensuremath{\Lambda} spectrum. We also show in a simple manner why it generates a nonzero \ensurem…
Cleaved GaAs surfaces decompose under weak pulsed-laser irradiation, leading to the formation of metallic Ga islands. The reduction of band bending nonuniformities in photoemission spectra acquired during the laser pulses, in concert with new core-level fitting techniques which treat broadened spectra, permits a detai…
Electrochromic properties of the V2O5 thin films prepared from a spinnable organic vanadium solution were investigated. The films heat-treated at 400 °C showed clear two-step electrochromism, deep blue⇄green⇄yellow, with its response time for obtaining ΔOD=0.5 being ∼2 s. The yellow and green colors showed good memory…
The dielectric constant (\documentclass{article}\pagestyle{empty}\begin{document}$ \varepsilon ' $\end{document}) and dielectric loss tangent (tan δ) of mixed Li-Cd ferrites of various compositions are measured at room temperature in the frequency range 1 to 100 kHz using a capacitance bridge. Plots of dielectric cons…
Effects connected with elastic fields of straight edge dislocations in a thin two-phase plate with different moduli are studied. It has been established that interaction of the dislocation with point defects leads to impurity-vacancy polarization of the plate when impurities and vacancies do not only form the Cottrell…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtomic-Scale Imaging of Materials by Z-Contrast Scanning Transmission Electron MicroscopyS. J. PennycookCite this: Anal. Chem. 1992, 64, 4, 263A–272APublication Date (Print):February 15, 1992Publication History Published online31 May 2012Published inissue 15 February 1992htt…
The effective thermal conductivity of binary dispersed composites prepared from mixed and compacted powders of NaCl and low-density polyethylene (LDPE) was measured over the entire range of volume fraction at temperatures in the range 120–320 K together with pressures up to 1.73 GPa. Measurements were made using the t…
The desorption of As from GaAs (001), (111)B, and AlAs(001) is studied in detail by measuring the electron-beam current reflected from these surfaces. When the As supply to the surface was terminated, the electron specular reflectivity decreases exponentially with time due to the As desorption. The decay rate was much…
Abstract Direct current (dc) and alternating current (ac) electrical properties of semicrystalline poly(butylene terephthalate) (PBT) are investigated as a function of temperature and frequency. Dc electrical conductivity measurements have been performed over the temperature range −75°C to 130°C and point out an essen…
Thulium (Tm) emissions were investigated in 390 keV, Tm-implanted AlGaAs, GaAs, InP, and Si using photoluminescence spectroscopy. The emissions in the different semiconductors were observed in the 1.20 to 1.35-μm region and are attributed to transitions between the crystal-field-split spin–orbit levels 3H5– 3H6 of Tm3…
Pressure dependence of the electrical conductivity of a range of polypyrrole samples doped to various levels is interpreted in terms of variable-range hopping theory. All samples are well described by a model that treats the density of localized states around the Fermi level as the pressure-dependent commodity. The pr…
Using an expansion of \ensuremath{\sim}12 700 plane waves, we calculate the lattice constants and heat of formation of tetragonal ${\mathrm{B}}_{50}$, ${\mathrm{B}}_{48}$${\mathrm{C}}_{2}$ (${\mathrm{B}}_{50}$${\mathrm{C}}_{2}$${)}_{\mathrm{\ensuremath{\alpha}}}$, (${\mathrm{B}}_{50}$${\mathrm{C}}_{2}$${)}_{\mathrm{\e…
We investigate the size evolution of bonding in magnesium clusters ${\mathrm{Mg}}_{\mathit{n}}$, with n\ensuremath{\le}20. Computations are performed in the density-functional scheme with two prescriptions for the exchange-correlation energy: the local-density approximation (LDA), and an improved scheme including grad…
The most pronounced effects of elastic scattering in solids are observed in electron backscattering experiments, which, as a result, offer the possibility to test the completeness of the theoretical models of electron transport. For this purpose, elastic backscattering from the Au/Ni(111) system was studied in the pre…
Molecular structures, harmonic vibrational frequencies, and infrared intensities for diborane B2H6, dialane Al2H6, and digallane Ga2H6 have been determined using high level ab initio quantum mechanical methods. The highest level of theory employed in this study is the single and double excitation coupled cluster (CCSD…
The electromigration diffusion boundary value problem with the perfectly blocking diffusion barrier is numerically investigated. Three possible boundary conditions are identified as physically meaningful and the solutions compared at the blocking barrier. It is seen that the solution of M. Shatzkes and J. R. Lloyd [J.…
The electrification of polymethyl methacrylate films is studied by scanning force microscopy. Charged areas generated by contact electrification are always found to be larger than those generated by corona discharge, and are surprisingly much larger than the area of contact. After each single contact made with the met…
We present first-principles calculations for the optical properties of titanium dioxide in the rutile structure. The electronic band structure has been calculated self-consistently within the local-density approximation using ab initio pseudopotentials and a plane-wave basis. Optical properties are determined from the…
Abstract Thermal behavior of brominated atactic polypropylene (BAPP), obtained by thermal bromination of atactic polypropylene (APP), was evaluated by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). It was found that the initial decomposition temperature (IDT) and char yield increase with the…