Materials Literature
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Two new salts (p-NO2BzPy)2 [Ni(4-pedt)2] and p-BrBzPy [Ni(4-pedt)2] [BzPy=benzylpyridinium, 4-pedt = 1-(pyridine-4-yl)- ethylene-1,2-dithiolate] were prepared and characterized by X-ray diffraction and magnetic measurements. The paramagnetic salt p-BrBzPy [Ni(4-pedt)2] displays strong pair antiferromagnetic interactio…
Temperature changes caused by latent transformation heats are an integral part of the behavior of shape memory alloys and inevitably couple the thermal and the mechanical fields. This general behavior is covered by the Mu¨ller-Achenbach-Seelecke (MAS) model. Its versatility has been documented extensively in the liter…
α-Dibromides of BOC-protected 1-aminopyrrole and 4-amino-1,2,4-triazole have been prepared and their molecular structures have been confirmed by X-ray crystallography.They can be used for polymer synthesis.
The aim of this work was to study the influence of CuO loading and pretreatment procedure on morphological, redox and acidic properties of CuO–CeO2 catalysts, and correlate them to their water–gas shift (WGS) activity. Catalysts with a 10, 15 and 20 mol% CuO loading were synthesized with a method of coprecipitation, c…
A conceptual design study of Pb-Bi-cooled fast reactors in which the fuel cycle needs only natural uranium input has been performed. In this design, the reactor cores are subdivided into several parts with the same volume. The region with natural uranium is put in the central core and the outer region is arranged with…
Two series of silver modified Ni-Mg materials were synthesized by precipitation-deposition on SiO 2 support derived from two silica sources: diatomite activated at 800°C ( Series a ; Mg/Ni = 0.1 and SiO 2 /Ni = 1.07) and synthetic water glass ( Series b ; Mg/Ni = 0.1 and SiO 2 /Ni = 1.15). The modification with silver…
Experimental results show that martensitic phase transformations in shape-memory alloys occur in localized zones. Based on a micromechanical model we want to simulate these effects. The mathematical treatment is accompanied by a finite-element calculation which includes, due to the model modification, a regularization…
Mineral sepiolite (Mg4Si6O15(OH)2·6H2O) with fibrous morphology is one of candidates for substituting asbestos. When sepiolite was used as a matrix of an inorganic insulator, it was expected that formation of cordierite (Mg2Al4Si5O18) at elevated temperatures should improve its thermal shock resistance. We investigate…
The structural and phase state of the C 60 -C 70 system at various C 60 /C 70 ratios in mixtures obtained by the vaporization of solutions in toluene at ∼98°C was studied by X-ray structure analysis, differential scanning calorimetry, and infrared spectroscopy. Solid solutions based on the face-centered cubic packing…
A process for coating E-glass fibers with polystyrene–polyethyleneimine (PEi) core–shell particles was developed, and uniform monolayers of particles of 143 and 327 nm diameter were covalently bonded to the glass surface. The effect of the particle coatings on the mechanical properties of fiber-reinforced composites o…
Molecular dynamics simulations (MD) are performed in the noble-metal halide mixtures AgI-AgBr and AgI-AgCl systems in their solid, superionic and molten phases. Frequency dependent diffusion coefficients, Di(ω), are obtained from velocity correlation functions by MD to investigate the frequency distributions of phonon…
On the example of a cold-rolled (110)[001] single-crystal Fe-3 wt % Si alloy, it has been shown that irradiation by accelerated Ar ions and application of an external magnetic field during annealing exert a substantial influence on the formation of structure and texture upon primary recrystallization.
Electrical conductivity was performed on amorphous thin films of Ge1–xSe2Pbx (with x = 0, 0.2, 0.4, 0.6 and 0.8) as a function of temperature in the range 300–450 K. The experimental results indicate that the conduction is through thermally activated process having two conduction mechanisms. In the first region at hig…
The article specifies a method used for the manufacture of a new Ni-Al-C alloy with the description of alloy microstructure. When proper conditions are maintained, the said alloy after solidification forms a natural "in situ" Ni3Al/C composite. Particular attention was paid to the process of synthesis of Ni3Al phase b…
A new approach to reduce the reverse current of Ge pin photodiodes on Si is presented, in which an i-Si layer is inserted between Ge and top Si layers to reduce the electric field in the Ge layer. Without postgrowth annealing, the reverse current density is reduced to 10 mA/cm 2 at -1 V, i.e., over one order of magnit…
The electrochemical behaviour of zinc has been extensively studied in alkaline and acid media, but only a few studies have been reported in neutral solutions, particularly in deaerated media. Zinc passivation in neutral medium and the effect of the ClO4- ion on the nucleation and growth of the passive layer is studied…
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The electron beam induced current (EBIC) collection efficiency η of a circular nano Schottky contact of radius rc perpendicular to the electron beam was simulated using a Monte Carlo (MC) algorithm. The EBIC was obtained by simulating the random diffusion and collection of the minority carriers that are generated at p…
The magnetic structure of Sr 5 Rh 4 O 12 is based on Ising chains of rhodium ions with a variable valence, Rh 3+ -Rh 4+ . The ordering in the chains is assumed to be ferromagnetic. It has been shown that the magnetic structure and phase diagram of Sr 5 Rh 4 O 12 are well described in a model taking into account weak a…
Oxidation-induced constituent separation of ternary Fe/CoO nanocrystals has been investigated to evidence their exchange bias mechanism, which is important for conceptually new design, synthesis and utilization of magnetic nanostructures.