Materials Literature
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Abstract Measurements of complex impedance and 2H NMR spectra were performed on a layer silicate compound, Na-RUB-18 (sodium octosilicate, NaSi4O8(OH)·nH2O), to investigate hydrogen dynamics in crystals. A high proton conductivity amounting to ca. 10−1 S m−1 was observed at room temperature under 100% relative humidit…
Sm2Fe17−xNbxNy (x = 0−4) powder was synthesized by HDDR treatment and nitrogenation. The effects of partial Nb substitution for Fe on the structural and magnetic properties of Sm2Fe17−xNbx alloys and their nitrides were investigated. It was seen that Sm2(Fe, Nb)17 phase exists in both annealed and HDDR-treated Sm2Fe17…
Article Refinement of the crystal structures of trinickel boron, Ni3B, and tripalladium boron, Pd3B was published on April 1, 2006 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 221, issue 1-4).
Nous avons resolu la structure cristalline de la paděraite argentifere, dont la composition ideale serait Cu 7 (Ag 0.33 Pb 1.33 Bi 11.33 ) Σ13 S 22 , a 17.585(4), b 3.9386(9), c 28.453(7) A, p 105.41(1)°, V 1899.8(8) A 3 , groupe spatial P2 1 /m et Z = 2, provenant d'un gisement de skam a Baila Bihor en Roumanie, par…
Polymer fibers are widely used in many industries, ranging from filtration, composites, tissue engineering, and electronics. The surface properties of polymer fibers are of importance in these applications. The surface properties of polymer fibers can be modified by different techniques. In this study, magnetron sputt…
Abstract The layer of corrosion products forming on zinc in atmospheric environments of varying aggressivity have been characterised and compared with previous results obtained for carbon steel. The characteristics of said layers have been linked to the nature of the products found. Likewise, we have found that EIS is…
"Copper atoms have been introduced by diffusion in NaCl, KCl and KBr crystals at 500±C. The crystals have been optically analyzed with photoluminescence measurements and by scanning electron microscopy. The emission and excitation spectra measured at low temperatures show the exciton confinement effect, indicating the…
Poly(3-hydroxyalkanoates) (PHAs) have been drawing much attention as biodegradable substitutes for conventional non-biodegradable plastics. Intensive research on the physiology, biochemistry and molecular genetics of the metabolism of PHAs during last two decades has increased our knowledge on the biosynthesis of thes…
It is shown that the dc-superimposed driving mode is more useful for the efficient operation of a novel thermally induced ultrasonic emitter based on nanocrystalline porous silicon (nc-PS) than the conventional simple ac-voltage driving mode. The nc-PS device is composed of a patterned heater electrode, an nc-PS layer…
An electromagnetic method based on rigorous diffraction theory of gratings is applied to the analysis of fields in semiconductor laser cavities. The method is based on the Fourier modal method; it is fully rigorous for infinitely periodic resonators and highly accurate for single resonators when absorbing boundary con…
Ferroelectric Sr 0.6 Ba 0.4 Nb 2 O 6 (SBN) films were fabricated on various substrates such as Si, Pt-coated Si, and MgO by pulsed laser deposition. The effect of deposition condition, substrate, (La 0.5 Sr 0.5 )CoO 3 buffer layer on the structure and morphology of SBN films were investigated systematically by x-ray d…
Sintered compacts of boron carbide were prepared by subjecting fine powder of boron carbide to high pressures and temperatures (5-6 GPa, 1000-1500°C) in the presence of a suitable binding material, namely TiC (5wt.%) or Co (5wt.%). The composites prepared by this method showed a microhardness of about 2800 kg/mm 2 , w…
The optical and electrical properties of diamond-like carbon films implanted with copper ions with energy 40 keV and implantation doses ranging from 3 × 10 14 to 3 × 10 17 ion/cm 2 are studied. The effect of postimplantation thermal annealing on the properties is examined. It is established that the copper atoms impla…
A displacement cascade formation in bcc-Fe and fcc-Ni has been investigated by using molecular dynamics (MD) simulations and improved many-body interatomic potentials. To assure the statistical validity of the calculation, multiple simulations are required at identical conditions. Six cascade simulations were run in t…
Bent‐core, polycatenar pyridines are reported, synthesized via a Siegrist coupling of di‐ and tri‐alkoxybenzylidene fragments with 2,6‐dimethylpyridine. None of these pyridines was liquid crystalline. Isomeric materials based on a 3,5‐disubstituted pyridine core were mesomorphic in hydrogen‐bonded complexes, whereas t…
As mechanical vibration usually exists in HV motors and generators, its influence on the partial discharge (PD) needs to be studied so as to improve the reliability of on-line PD monitoring method. In this report, the mechanical vibration frequency was synchronized to the power frequency and the effects of vibration p…
Cl-bearing galenobismutite (Cl ranging from 0.12 to 1.45 wt.%), discovered among high-temperature fumarole incrustations at "La Fossa" crater (Vulcano Island, Italy), has been chemically and structurally investigated. The mineral is commonly associated with bismuthinite, cannizzarite, lillianite, heyrovskýite and gale…
In recent years significant advances have been made in the field of multiphase steels for automotive applications. Complex steel grades have been developed with exceptional mechanical properties: they combine high strength values with an excellent ductility. Transformation-induced plasticity (TRIP) steels show these p…
Article Structure and High-Temperature Properties of the Alloyed Quasicrystalline Al-Cu-Fe Powders and Thermal-Sprayed Coatings from Them was published on April 1, 2006 in the journal High Temperature Materials and Processes (volume 25, issue 1-2).
In this report, effect of MgO and Y2O3 additives on modifying the dielectric constant-temperature (K-T curve) properties of the BaTiO3 materials for multilayer ceramic capacitors (MLCC), using base metals (Cu and Ni) as electrode materials was systematically studied. Low temperature coefficient of capacitance (TCC), w…