Materials Literature
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Les propriétés optiques d'une série d'oxydes mixtes du systeme BaO-RE2O3 (RE = Gd, Y), de formule générate BaRE2O4 sont analysées. L'europium trivalent est utilisé comme dopant actif, remplaçant en partie l'élément de terre rare de la matrice. La quantité du dopant est faibic (2%) et n'altßre pas la structure. D'après…
The Raman spectra of Bi2Ti4O11 at hydrostatic pressure or high temperature show that the frequency of the soft mode has a non-zero value at the phase transition point. The Raman spectra of Bi1.8La0.2Ti4O11 and Bi1.8Yb0.2Ti4O11 at high pressure reveal that there is an additional phonon mode in the low-frequency region.…
The temperature behavior of the charge-density-wave (CDW) state in one-dimensional conductors is studied within the framework of a mean-field approach using the exact solution of the self-consistent equations. The properties of the CDW condensate are found to be dependent on the value of the dimensionless parameter wh…
The specific heat of Grafoil, an artificial graphite made by Union Carbide, has been measured at temperatures as low as 100 mK, thus extending substantially the range investigated up to the present. An unusual contribution to the specific heat is found which obeys a ${\mathit{T}}^{\mathrm{\ensuremath{\alpha}}}$ law (w…
The unusual galvanomagnetic properties of the monoclinic semimetal ${\mathrm{SrAs}}_{3}$, first-order longitudinal Hall effect and magnetoresistivity in Hall geometry, are quantitatively described within a two-band model. The ten model parameters for T\ensuremath{\rightarrow}0 K are obtained from a fit to 14 low-field…
The current through porous silicon p-n junctions is measured as a function of bias voltage and temperature. The ideality factor m=4 value observed under forward bias indicates that channels are present at the unpassivated porous silicon junction surfaces. The generation-recombination current stemming from the space-ch…
A simple two-variable model for the dynamics of sheared colloidal crystals gives shear-melting at low shear rates and suggests a novel mechanism for recrystallization to the solid phase at high shear rates. The nonequilibrium phase diagram agrees qualitatively with experiments and molecular dynamics simulations.
By taking together various observations on air bubbles bursting at the surface of seawater, the production rate and size spectrum of film drops are deduced. The number of film drops produced is proportional to the square of bubble diameter, and the size spectrum of film drops produced by bubbles of various diameters i…
We report on structural and electrical properties of thin granular ${\mathrm{Pd}}_{\mathit{x}}$${\mathrm{C}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ films with palladium (Pd) metal volume fractions 0.3x0.34, approaching the percolation threshold (${\mathit{x}}_{\mathit{p}}$=0.3) from the metallic side. As revealed from…
In small samples of ${\mathrm{NbSe}}_{3}$ the broadband noise of the sliding charge-density wave (CDW) can be partially resolved into two-state and multistate fluctuators, which show strong sensitivity to the bias current and temperature. Explicit violations of detailed balance appear. Near the threshold bias for slid…
Fullerenes have been converted to diamond crystals with the size of 0.1 mm at 5.0–5.5 GPa and 1400 °C, using NiMnCo catalyst. They are similar to graphite in the growing phenomena. They are transformed into diamond directly without being graphitized first.
We report high-resolution electron-energy-loss (HREEL) spectra at low energy (0--20 eV) on solid multilayer films of Ar. The present results are compared with optical data of similarly deposited films as well as with electron-energy-loss spectroscopy of Ar in the gas phase. Relatively wide and intense bands located at…
Calculations based on simple interaction potentials are performed to define the adsorption characteristics of molecules encapsulated in carbon nanotubules. The continuum approximation used to describe the cylindrical sheets is shown to work fairly well within a large range of tubule diameters. Criteria for molecule co…
X-ray-photoelectron spectroscopy (XPS) and optical measurements have been performed to investigate the structure of electronic states in yttrium-stabilized zirconia. From reflectivity observations, the spectral behavior of the dielectric function, of the energy loss, and of the effective electron number in the range 3…
Forces on the host-metal atoms surrounding a hydrogen atom at different interstitial positions in palladium and niobium are calculated from first principles in the local-density approximation with a mixed-basis pseudopotential supercell approach. For supercells ${\mathrm{Pd}}_{\mathit{n}}$H (n=1,4,8,16,32) previously…
Various NO-reduction reactions on Pt(100) exhibit similar dynamical behavior, presumably due to an empty site requirement for NO dissociation. This motivates analysis of a lattice-gas model which incorporates this feature, and which here is chosen to mimic the NO+CO reaction on Pt(100): both reactants adsorb at single…
Electrical transports of LaFe 1- x Ti x O 3 ( x ≤0.10) containing ligand holes (3 d 5 L ) were investigated by dielectric properties, ac and dc conductivities. A dielectric relaxation peak appeared with the activation energy which increased from 0.49 eV to 0.56 eV with increasing the amount of Ti ions. A thermal activ…
The dispersion of the nonlinear refractive index of direct-gap semiconductors, over the full sub-band-gap spectral region, is determined within the four-band Kane model. The divergences of individual terms in the nonlinear susceptibility, which have prevented previous full calculations, are avoided by selecting suitab…
We have studied the molecular orientational order and director kinetics of the nematic phase formed by dissolving poly-p-phenylene-terephthalamide (PPTA) in sulphuric acid using deuterium NMR spectroscopy. Measurements were made on standard polymer samples using deuterated sulphuric acid and with deuterated PPTA in no…
Waveguide losses in thin film polyimides using waveguide loss spectroscopy and photothermal deflection spectroscopy as a function of cure cycle and structure were studied. Fluorinated sidegroups on the polyimide backbone lead to decreases in birefringence and absorption. The primary waveguide loss mechanism is absorpt…