Materials Literature
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We report evidence for a significant increase of bulk dislocation density upon poling of polycrystalline ${\mathrm{BaTiO}}_{3}.$ The synchrotron high-resolution x-ray-diffraction measurements yield a dislocation density on the order of ${10}^{9}/{\mathrm{cm}}^{2}$ and an associated strain-energy increase of about 20 $…
Niedrigenergetische Metall-Ligand-Charge-Transfer-Übergänge sind mit den sehr großen molekularen NLO-Koeffizienten β der Komplexe [RuII(NH3)5(N-R-4,4′-bipyridinium)]3+, R=Methyl, Phenyl, 4-Acetylphenyl, verbunden. Chemische Oxidation zu den RuIII-Komplexen löscht die MLCT-Banden und schwächt die NLO-Aktivität deutlich…
S. Ajith Kumar C. L. Nagendra H. Ganesh Shanbhogue G. K. M. Thutupalli Laboratory for Electro-Optics Systems (LEOS) ISRO Satellite Center (ISAC) A3-6 Peenya Industrial Estate Bangalore 560058 India Abstract. Design optimization and experimental studies of bandpass optical filters useful in the near-IR region from 1200…
The monolayer behaviors of poly( N -alkylmethacrylamides) with various pendant substituents, octyl (POMA), dodecyl (PDDMA), tetradecyl (PTDMA), hexadecyl (PHDMA), or octadecyl (PODMA), on the water surface and the properties of the Langmuir−Blodgett (LB) films were investigated. Among those polymers, PTDMA formed the…
The electrochemical, galvanic, and mechanical responses of grade 2 titanium in 6% sodium chloride (NaCl) solution at different temperatures were investigated. The initial corrosion potential and cathodic reaction rate increased with decreasing pH and increasing temperature. The initial corrosion potential changed when…
The initial stages of electrochemical intercalation of lithium in sputter-deposited tungsten oxide thin films were studied. The as-deposited films show a substantial irreversible uptake of lithium without an electrochromic effect. This trapping of lithium is associated with the presence of excess oxygen in the film. T…
Abstract Samples of Silica Springs allophane from Tongariro National Park, New Zealand, having Al/Si atomic ratios in the range 1.1-1.9, were studied by 27 Al nuclear magnetic resonance (NMR) spectroscopy with high field strength (9.4 and 11.7 T) and fast magic-angle spinning (MAS) (9-13 kHz). Spectra for all samples…
Changes in surface reactivity produced by different types of liming in a Chilean Andisol were determined. Barros Aranas soil with 53% aluminum (Al) saturation and 4.8 pH was incubated with different amounts of calcitic and dolomitic lime. Each cmol of calcitic or dolomitic lime applied per kg of soil increased the pH…
In order to attempt to industrial applications of superplastic forming, the present authors have investigated to design high strain rate superplastic zirconia ceramics. Very recently we found a new ceramic with high strain rate superplasticity (HSRS). A new ceramic, ZrO 2 (3Y)-2mol%CaO-2mol%TiO 2 were examined at defo…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and the Initiator Activity of Fluorenyltriphenylphosphonium Salts in the Cationic Polymerization of Epoxide. Novel Thermally Latent InitiatorsTatsuya Toneri, Ken-ichi Watanabe, Fumio Sanda, and Takeshi EndoView Author Information Research Laboratory of Resources Utili…
Silica powders and films with embedded organic liquids (OLs) that are storage stable can be prepared with high OL concentrations when modern sol-gel techniques are used. The preparation and thermal release behavior of silica sol-gel glasses with different embedded organic liquids are described and the results discusse…
Abstract The structure of antimonian dussertite, (AsO 4 ) 2 (OH,H 2 O) 6 , has been refined in space group R3̄ m with a 7.410(3), c 17.484(4) Å, Z = 3, to R = 3.2 % and R w = 3.7 % using 377 observed reflections with I ≥ 3 σ( I ). The structure is of the alunite-type and consists of sheets of corner-sharing (Fe 3+ ,Sb…
Abstract Pd catalysts supported on various metal oxides were investigated for the low-temperature catalytic combustion of methane. Of the catalysts examined, a Pd/SnO2 catalyst demonstrated excellent activity despite its low specific surface area. The activity of the Pd/SnO2 catalyst was lowered with the addition of M…
In this paper, we investigate the vibrational FT-IR and FT-Raman spectra of a series of α,α‘-diethyl substituted oligothiophenes with variable chain lengths (from trimer to hexamer) in the neutral state. The experimental data support the existence of an effective intramolecular delocalization of the π electrons. Ab in…
Temperature-dependent neutron powder diffraction experiments (diffractometer 3T2-LLB, Saclay, France, lambda = 1.227 Å) have been performed on the perovskite-like lead hafnate titanate PbHf(0.4)Ti(0.6)O(3). This compound belongs to the solid solution denoted PHT, which derives from the well known ferroelectric PZT ser…
We use the data generated in recent first-principles molecular-dynamics simulations of liquid selenium at the temperatures 570, 870, and 1370 K to investigate defects in the liquid. The defects represent disruptions of the chain structure associated with onefold and threefold atoms ${(C}_{1}$ and ${C}_{3}$ defects). W…
Site-specific mutants have been produced in order to investigate the role of proline 204 in the 'hinge' region of yeast phosphoglycerate kinase (PGK). This totally conserved proline has been shown to be the only cis-proline in the high resolution crystal structures of yeast, B. stearothermophilus, T. brucei and T. mar…
Sr5(VO4)3(CuO) was prepared via solid state reactions from mixed powders of the metal oxides or carbonates in corundum crucibles in air (1173–1740 K). The compound is transparent and stable in air. The color changes with the preparation temperature from light gray (1173 K) to gray (1740 K). The crystal structure (spac…
Mechanisms of defect formation near surface ledges of a diamond cubic crystal subjected to compressive strain parallel to the surface are investigated as precursory processes to dislocation nucleation in Si1-xGex/Si(100) heteroepitaxial thin films under surface diffusion conditions. This study is motivated by our prel…
Two standard methods have generally been used to prevent destructive ice formation when flash cooling macromolecular crystals for cryocrystallography: (i) permeating the crystal lattice with a cryoprotectant, or (ii) replacing the external liquid around the crystal with an immiscible oil. In two cases where both of th…