Materials Literature
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Running rings around mercuric ions: A [26]hexaphyrin(1.1.1.1.1.0), comprising an α,α′-bipyrrole unit and four pyrrolic and five pentafluorophenyl rings, was prepared and characterized by X-ray crystallography (see picture; N blue, F green, C black). The expanded porphyrin displays near-infrared luminescence above 900…
The thermal conductance of interfaces between materials with low Debye temperatures (Pb or Bi) and dielectrics or semiconductors with high Debye temperatures (hydrogen-terminated Si, $\mathrm{Si}{\mathrm{O}}_{2}$, the native oxide of Be, sapphire, or hydrogen-terminated diamond) is measured using time-domain thermoref…
By means of spin-polarized low-energy electron microscopy (SPLEEM) we show that the magnetic easy-axis of one to three atomic-layer thick cobalt films on ruthenium crystals changes its orientation twice during deposition: one-monolayer and three-monolayer thick films are magnetized in-plane, while two-monolayer films…
Successful integration of ultra low-k materials in Cu/low-k interconnect systems plays a key role for the next generation of highly integrated circuits of the 65 nm and 45 nm technology nodes with high operation speed. The main goal of this is the improvement of the transmission features of the interconnect system bet…
The dendrite growth and solute microsegregation of Fe-C binary alloy are simulated during solidification process by using cellular automaton method. In the model the solid fraction is deduced from the relationship among the temperature, solute concentration and curvature of the solid/liquid interface unit, which can b…
Abstract A new photochromic organic compound of thiosemicarbazone, 4‐( p ‐bromo‐ α ‐methylaminothiocarbonyl hydrazonobenzal)‐2,5‐dihydro‐3‐methyl‐5‐oxo‐1‐phenyl pyrazole, was synthesized and characterized by elemental analyses, IR, 1 H NMR spectra, and X‐ray single‐crystal diffraction analysis. The compound exhibited…
The results of micromagnetic modeling show that the phenomenon of thermal magnetization analogous to that observed in polycrystalline samples is also possible in a highly anisotropic Nd 2 Fe 14 B single crystal. In this case, the thermal magnetization is related to a transition of the single crystal from a metastable…
The structures of d -metal sulfides, selenides, and tellurides containing a tetrahedral complex anion have been compared to 1573 representatives of the topological types of binary compounds with the use of the TOPOS structural topological program package. The cases of similarity between these classes of compounds are…
The thermodynamic properties of the Ln 2 BaO 4 phases (Ln = Dy, Ho, Sm) were studied by the electromotive force method with a fluoride electrolyte (890–1180 K), solution calorimetry in 1.07 N hydrochloric acid at 298.15 K, and differential scanning calorimetry (298–860 K). The experimental data were jointly processed,…
Mn doped Na0.5Bi4.5Ti4O15 (NBTM) ceramics were fabricated by ordinary firing (OF) and hot forging (HF) method. The HF(//) sample is strongly oriented to the c-axis which is confirmed by the X-ray diffraction. Dielectric constant of HF(⊥) sample at Curie temperature is about 5176 which is larger than that (416) of the…
4′‐Ferrocenyl‐1,1′‐biphenyl‐4‐yl 4‐alkoxybenzoates Fc–(C6H4)2–OC(O)–C6H4–O–C n H2n+1 (n = 8, 10, 12) (3a–c), representing a new class of ferrocene‐containing thermotropic mesogens with nematogenic properties, were prepared. Two approaches were used for the construction of these mesogens: (i) reaction of 4′‐ferrocenyl‐…
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…