Materials Literature
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The photoluminescence properties of Pr(3+)-doped GeS(x)-based glasses are studied and compared with those of other sulfide and fluoride glasses. The possibility of highly pump-power-efficient fiber amplifiers based on these GeS(x)-containing glasses in the telecommunications window at 1.3microm is discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-Saturated Mesoporous MCM-41 Systems Characterized by 1H NMR Spin-Lattice Relaxation TimesEddy Walther Hansen, Ralf Schmidt, Michael Stoecker, and Duncan AkporiayeCite this: J. Phys. Chem. 1995, 99, 12, 4148–4154Publication Date (Print):March 1, 1995Publication History…
The ferroelectric switching of columnar 1,2,5,6,8,9,12,13-octakis-((S)-2-heptyloxy-propanoyloxy)dibenzo[e,l]pyr-2-heptyloxy-propanoyloxy)dibenzo[e,1]pyrene was studied in detail between 60°C and the clearing point 115°C. The switching angle (optical tilt angle) is ±24.5° up to 10V μm−1 and ±37° at higher field strengt…
Carbon fibres prepared by the catalytic decomposition of acetylene over finely dispersed cobalt, supported on amorphous silica, are often helix shaped. The structure of such carbon fibres was studied by means of various electron diffraction techniques and by electron microscopy. It was shown that the tubules are hollo…
Quenched randomness and finite size can both have substantial effects on critical behavior at phase transitions. A high-resolution ac calorimeter study has been carried out on octylcyanobiphenyl (8CB) in four silica aerogels of different porosities (mass densities \ensuremath{\rho}=0.08--0.60 g ${\mathrm{cm}}^{\mathrm…
Diamond-coated silicon field emitters were fabricated and investigated. Emission currents of few μA per tip at voltages of several hundred volts were obtained from very blunt tips with curvature radii up to 3 μm. The values of the effective work function calculated from Fowler–Nordheim plot were in the range from 0.3…
Strongly bound, closely packed self-assembled monolayers of condensed alkyltriethoxysilanes were formed on mica and other substrates with a packing density of about 20 Angstrom(2)/molecule. Techniques to exploit these monolayers in the surface forces apparatus (SFA) are described. The length of the alkyl chain of the…
The activation energy of electromigration in 'bamboo'-type, passivated Al-1% Si/TiN/Ti lines was determined by means of high resolution resistance measurements at wafer level. Both the very early stages, with a nonlinear behaviour of the resistance, and the subsequent stages, characterized by an approximately constant…
For Pb(ZrxTi1−x)O3 (PZT) thin-film capacitors to be used in ferroelectric nonvolatile memories, they must have low polarization fatigue and low leakage currents. PZT capacitors fabricated in our laboratory with RuO2 electrodes exhibit excellent polarization fatigue characteristics, but they have large and variable lea…
Abstract As a simple method for evaluating the reflection and transmission characteristics of a grating waveguide, an analysis procedure is proposed and formulated that is a combination of the coupled‐mode theory and the finite‐element method. The finite‐element method is used for the determination of the coupling coe…
Abstract A range of polyamides has been modelled using Monte Carlo routines based on carefully determined bond‐rotation potentials, bond length and bond angle. For each polymer type, a large number of chains has been built for different simulated temperatures, and the persistence lengths determined as an average over…
Structural phase transitions between various kinds of superlattice structures formed on a Si(111) surface have been investigated by spot analysis of reflection high-energy electron diffraction (RHEED). Reversible transitions induced by temperature changes and irreversible ones induced by metal depositions were observe…
Abstract The frequency dependence of dielectric constant ϵ′, dielectric loss ϵ″, and dielectric anisotropy were determined for poly(vinylidene fluoride) (PVDF) in microwave frequencies from 4 to 13 GHz. The ϵ′ and ϵ″ for PVDF films decreased with increasing frequency. Both ϵ′ and ϵ″ were larger in the transverse direc…
Abstract This paper presents a 27 Al and 29 Si MAS NMR study of K-feldspars and demonstrates that the spectra are sensitive to variations in the state of Al,Si order. For synthetically annealed samples, the results are in agreement with previous IR spectroscopy (Harris et al. , 1989) and demonstrate that Al,Si rearran…
Abstract— The fracture behaviour of high strength steels under the influence of hydrogen was studied, with special emphasis on the critical condition for the formation of intergranular (IG) cracks. Mechanical tests were carried out on cathodically charged specimens subjected to both a constant load and a constant disp…
Abstract The chlorite data presented are from four igneous complexes covering the compositional spectrum of igneous rocks (gabbro to granite) of orogenic and anorogenic settings. The four igneous complexes are; early orogenic gabbro-diorite-tonalite (D-T) suite, late orogenic granodiorite-adamellite (G-A) suite (both…
By considering the classical Oregonator model, the effect of the main reactants, i.e., bromate and malonic acid, on the behavior of the Belousov-Zhabotinskii system is studied. This analysis is a prerequisite for the understanding of the occurrence and disappearance of oscillations in batch reactors. A parametric anal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe New Orthosilicate Li4SrCa(SiO4)2: Structure and Eu2+ LuminescenceAnnapoorna Akella and Douglas A. KeszlerCite this: Inorg. Chem. 1995, 34, 6, 1308–1310Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https:…
Di-sodiumhydrogenphosphate (DSHP) inhibits the stress corrosion cracking (SCC) of α-brass in 0.1 M NaNO 2 . It increases the maximum stress and the time to failure at failure in slow strain-rate tests. It also changes the mode of failure to ductile failure in the presence of moderate concentrations. The results are co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Degree of Charge Transfer of Simple and Complex Cyanine-TCNQ Anion Radical Salts Studied by Resonance Raman and Infrared SpectroscopyShin-ichi Terashita, Kazumi Nakatsu, Yukihiro Ozaki, and Seishi TakagiCite this: J. Phys. Chem. 1995, 99, 11, 3618–3628Publicati…