Materials Literature
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Abstract The changes induced on the surface of polypropylene homopolymer following flame treatment have been studied. Surface compositions were determined using x‐ray photoelectron spectroscopy and compared to surface free energies estimated from contact angle measurements. The effect of air‐to‐gas ratio, total flow r…
The photosensitive ESR signals of singly negatively charged zinc vacancies (V, (V) and interstitial oxygen ions in a tetrahedral surrounding (O) are detected in undoped ZnO ceramic and their optical excitation and quenching behaviour is studied using the photo-ESR method. The investigations show that all these defects…
Cristallisation dans Pn2 1 a avec a=12,7640, b=10,5153, c=6,3648 A, Z=8; affinement jusqu'a R=0,028. La molecule est isostructurale avec KTiPO 5 decrit par Masse [Thesis (1974), Univ. of Grenoble, France]. Son reseau mixte comprend des octaedres VO 6 partageant des sommets et des tetraedres PO 4 delimitant des tunnels…
A new type of an optical polarizer consisting of anisotropic metallic island films is proposed, and its optical properties are investigated theoretically. It is shown that an extinction ratio of 63 dB and an insertion loss of 0.02 dB at a resonance wavelength, e.g., 0.64 microm, are expected for the polarizer when sil…
The piezoelectric tensor of the organic nonlinear optical compound 2-methyl 4-nitroaniline (MNA) is refined from the measurements of the shift of the Bragg peaks on application of an external electric field. The ``three-step modulation'' method is used, in which the gating of the x-ray signal is synchronized with the…
The growth kinetics of diamond film has been studied, grown by a hot-filament chemical vapor deposition method, to obtain a fundamental information for the growth process of diamond from the gas phase. In order to study the growth kinetics of a pure diamond, the deposition conditions for high-quality diamond are first…
A new linear epoxy polymer containing 4-amino-4′-nitrotolane chromophores attached to the chain backbone was synthesized in an attempt to enhance both the poling-induced nonlinear optical susceptibility and its long-term stability. The polymer films poled by corona discharge showed very large nonlinear optical doublin…
We report the observation of two types of ${\mathrm{BaTiO}}_{3}$ thin films, one exhibiting the Poole-Prenkel transport mechanism and the other the field-enhanced Schottky mechanism. A factor-of-2 difference in the slope of the ${\mathrm{log}}_{10}$(I/V)-vs-${\mathit{V}}^{1/2}$ curves has been measured for these two t…
Diamond films grown in (A)CO/H2 and (B)CO/O2/H2 systems at substrate temperatures (Ts) between 403 and 1023 K were characterized by x-ray diffraction, Raman spectroscopy, cathodoluminescence, and scanning electron microscopy. A large amount of polyacetylene inclusion occurred in the (A)CO/H2 system on reducing Ts, res…
The sublimation entropies of the thorium and uranium tetrahalides (except UI4 ) have been evaluated from torsion–effusion vapor pressure measurements and the results have been analyzed for compatibility with the spectroscopic and molecular constants of the gaseous molecules. New effusion pressure measurements are repo…
The thermal conductivity of a chemically vapor deposited (CVD) diamond film containing 0.07% 13C was measured as a function of temperature by ac and dc techniques and compared to CVD diamond with a natural isotopic abundance of 1.07% 13C. Unlike the single-crystal case where a large isotope enhancement effect has been…
Fourier transform infrared attenuated total reflection spectra of silica glasses implanted with Si or P were measured using a Ge as an internal reflection element. Calculated penetration depth of the infrared radiation is 0.2–1.0 μm depending on the wavelength. These values are comparable to the depths of ions implant…
The temperature dependence of the epitaxial growth of cerium dioxide (CeO2) layers on (111) silicon substrates was studied using ultra-high-vacuum evaporation, varying the substrate temperature in the range between 150 and 900 °C. Characterization using Rutherford backscattering spectrometry and reflection high-energy…
Thermal stress-induced voiding in narrow aluminum-based metallizations used as interconnects in microelectronic circuits has recently become a serious reliability concern. Room-temperature stress relaxation and associated physical phenomena in passivated and unpassivated aluminum-based metallizations, subsequent to ex…
We use Monte Carlo methods to study a lattice model of a dense melt of symmetric diblock copolymers. The calculations are performed in three dimensions using a slithering snake algorithm. In this work we present results for temperatures at and above the microphase separation transition (MST). The location of the MST i…
Cristallisation dans P3m1 avec a=4,272, c=17,633 A, Z=3; affinement jusqu'a R=0,035. La structure comprend neuf couches empilees le long de l'axe c et presente la combinaison d'empilements de cinq couches de Sb 2 Te 3 et d'empilements de deux couches de Sb 2
Low energy (0–12 eV) electron impact on condensed amorphous H2O and D2O films is shown to induce electron stimulated desorption of H− and D−, respectively, via dissociative electron attachment. The onsets for H− and D− detection are at 5.5 eV, with a maximum yield for anion desorption at ∼7.4 eV. The kinetic energy di…
Strongly [001] oriented lead zirconate-titanate [Pb(ZrxTi1−x)O3] thin films with tetragonal structure (0<x<0.52) have been successfully grown on (100)Pt/(100)MgO substrates by using metalorganic chemical vapor deposition (MOCVD). The metalorganic precursors were Pb(C2H5)4, Zr(DPM)4 and Ti(i-OC3H7)4. Scan…
ZnO, which normally occurs in the hexagonal wurtzite structure, can be transformed to the cubic rocksalt (NaCl) structure by the application of high pressure; this cubic phase has been reported to be metastable at atmospheric pressure. The band structure of this phase is calculated by the ab initio correlated Hartree-…
Synthetic diamonds grown using a solvent catalyst that contains Ni show the 1.401-1.404 eV luminescence and absorption system. Isotope splitting data on the zero-phonon lines establish that the optical center contains one Ni atom. Uniaxial stress and Zeeman measurements are reported. We show that the optical transitio…