Materials Literature
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PbZr 0.56 Ti 0.44 O 3 (PZT) epitaxial ferroelectric thin films on a LaAlO3 (100) substrate, covered by a metallic oxide electrode La0.5Sr0.5CoO3 (LSCO) are demonstrated in this work. The films are fabricated by the sol–gel method and effort was focused on thermal processing to obtain the desired epitaxial heterostruct…
The molecular orientation and aggregation behavior of 5-(4- N -octadecyl-pyridyl)-10,15,20-tri- p -tolylporphyrin (porphyrin 338a) in mono- and multilayer Langmuir−Blodgett (LB) films have been investigated by employing ultraviolet−visible (UV−vis) and infrared (IR) spectroscopies. It has been found that the porphyrin…
Two microscopic techniques, muon spin relaxation and neutron diffraction, including small-angle neutron scattering (SANS), have been used to probe into the relevant mechanisms that determine the macroscopic behavior in the series $({\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Tb}}_{x}{)}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{M…
Biochemical and enzymatic characterization of the novel proprotein convertase rat PC7 (rPC7) was carried out using vaccinia virus recombinants overexpressed in mammalian BSC40 cells. Pro-PC7 is synthesized as a glycosylated zymogen (101 kDa) and processed into mature rPC7 (89 kDa) in the endoplasmic reticulum. No endo…
Abstract High resolution and high efficiency planar display, one of the national priorities for advanced technologies and commercial applications, require highly efficient phosphor materials with crystalline monodispersive fine particles [1,2]. Europium oxide activated yttrium oxide (Y2O3:Eu) is a potential red-emissi…
Experimental current-voltage and current-light intensity characteristics of Schottky diodes with the structure: metal (Al) - porous silicon - n-type silicon substrate are presented. The measurements are carried out with a pulsed current in the high current densities conditions, which usually lead to irreversible break…
It is shown that the nonstationary thermoelectric power with characteristic rise and fall times of the order of seconds in multilayered structures with p - n junctions can be several orders of magnitude greater than the stationary thermoelectric power in a homogeneous semiconductor. This effect can be observed in poly…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSupramolecular Transformations of Vesicles from Amino Acid Based Double Chain AmphiphilesClaudio Cescato, Peter Walde, and Pier Luigi LuisiView Author Information Institut für Polymere, ETH-Zentrum, Universitätstrasse 6, CH-8092 Zürich, Switzerland Cite this: Langmuir 1997, 13,…
Abstract The corrosion behaviour of different FeNi alloys containing between 35 and 82 wt% nickel has been investigated in a humidity test between room temperature and 80°C. It has been found that higher nickel contents improve the corrosion behaviour. The poor corrosion behaviour of the low nickel containing alloys c…
The equilibrium geometries, vibrational frequencies, and infrared and Raman intensities for P 4 O 6 and P 4 O 10 were calculated using the Hartree−Fock self-consistent-field method. The computed geometries are in good agreement with experimental measurements. Scaling the ab initio vibrational frequencies of P 4 O 10 t…
Acoustic emission signal analysis has been used to measure the effect impact damage has on the burst pressure of 146 mm (5.75 in.) diameter graphite/epoxy and the organic polymer, Kevlar/epoxy filament wound pressure vessels. Burst pressure prediction models were developed by correlating the differential acoustic emis…
Semiconducting compounds based on silicides of 3d transition metals (MnSi 1.75 and CoSi) are promising thermoelectric materials for mass-produced thermoelectric generators. Their practical use has been delayed so far by the lack of reliable switching. Electrochemical surface treatment technology and metal deposition w…
Abstract. Viscosity of shock-compressed A1 and Pb was determined at pressures 31-202 C-Pa and 35-250 GPa by experimental investigation of the development of small perturbations in the shock wave front. Results of experiment shown that viscosities Al and Pb at pressure 31 GPa and 35 GPa are practically equal and amount…
The thermal degradation behavior of single‐layer BN and of double‐layer BN/SiC chemically vapor‐deposited fiber coatings in mullite‐fiber‐reinforced mullite composites was investigated by means of transmission electron microscopy after processing and heat treatment of the composites at 1000°, 1200°, and 1300°C for 6 h…
Melt-crystallization kinetics of long monodisperse n -alkanes with chain lengths in the region between 194 and 294 C atoms was investigated by differential scanning calorimetry (DSC) and real-time small-angle X-ray diffraction. Isothermal crystallization experiments on C 294 H 590 and cooling experiments on C 194 H 39…
Fatigue failure in near α-titanium alloys is associated with the formation of quasi-cleavage facets. These facets can span several α colonies and can share a common basal plane. The research focuses on the frequency of occurrence of such basal-plane-sharing colonies, comparing the ratio of the number of colonies with…
The interlayer magnetoresistance of the organic superconductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 )Br is measured at ambient pressure and under pressures of up to 12.5 kbar. In addition to the slow Shubnikov-de Haas oscillations with a frequency of ≃150 T observed at P ⩾5 kbar, rapid oscillations attributed to the magnetic bre…
Al 5.103 (Fe, Cr), orthorhombic, Imm 2, a = 12.34, b = 12.41, c = 30.71 Å, V = 4701 Å 3 , atoms/cell = 305 (average), D x \simeq 3.4 g cm −3 . A structural model of the non-Fibonacci approximant O-AIFeCr with composition Al 5.103 (Fe, Cr) found in an Al 12 Fe 2 Cr alloy has been derived from its high-resolution electr…
Abstract Pyroaurite-like carbonate hydroxide precursors Co1−xFex(CO3)x/2(OH)2·nH2O, where x varies in the range 0.25 ≤ x ≤ 0.75, yield cation deficient mixed oxides with particle dimensions in the nano-scale range. The thermal decomposition and spinel structure formation processes have been studied by thermal analysis…
A mechanism-derived lumping strategy for modeling the acid-cracking kinetics of hydrocarbon mixtures based on a limited set of pure component experimental data was tested in terms of its ability to predict the kinetics and product spectra from the reaction of a 1-phenyloctane/ n -hexadecane mixture. The modeling appro…