Materials Literature
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The compositional and thermal evolution of the crystal structure of the solid solution Bi 1- x Sm x FeO 3 synthesized at a high pressure of 4 GPa was investigated. It was found that Bi 1- x Sm x FeO 3 with x = 0.10 and 0.15 had an antipolar PbZrO 3 -type structure with a √2 a ×2√2 a ×4 a perovskite superstructure at r…
A single crystal of ferroelectric 0.88(Bi,Na)TiO 3 –0.12BaTiO 3 (BNT–BT) solid solution with tetragonal P 4 m m structure was grown by a top-seeded solution growth (TSSG) method at a high oxygen pressure ( P O 2 ) of 0.9 MPa. The crystals exhibited a large remanent polarization ( P r ) of 54 µC/cm 2 , which leads to a…
Nitrogenated carbon nanotips with a low atomic concentration of nitrogen have been synthesized by using a custom-designed plasma-enhanced hot-filament plasma chemical vapor deposition system. The properties (including morphology, structure, composition, photoluminescence, etc.) of the synthesized nitrogenated carbon n…
The corrosion inhibition effect of extracts of kola plant and tobacco in mixed form on the protection of mild steel specimens immersed in acid chloride solution was studied at ambient temperature by gravimetric and potential monitoring methods. The electrode potential monitoring was performed using a digital voltmeter…
Reactor physics, thermal hydraulics or material sciences are mainly studied to understand phenomena occurring in nuclear power plants or to improve the performance of existing or future reactors: improvement of core performances, research of new materials (fuels, core, reactor pressure vessels, internal structures, …)…
In this study, the mechanics of deformation (under the tension) and the stability of an elastic beam with a nanocoating under an axial compression are investigated. The behavior of the construction is modeled by the two-layered beam. The basic relations of the first layer, that is, an elastic beam gives in the framewo…
The series of glassy ribbons Gd60M30In10 (M = Mn, Co, Ni, Cu) was synthesized by melt-spinning. The change of transition element M in these Gd-based metallic glasses was proven to induce huge variations of the Curie temperature TC, magnetic entropy change peak values ΔSmpeak, and widths at half maximum values of the m…
Gold nanoparticles were prepared in aqueous colloidal solutions and their interaction with L-arginine solutions at different concentrations was investigated by UV-vis spectroscopy, transmission electron microscopy (TEM) and atomic force microscopy (AFM). The shift towards red of the absorption maximum of gold nanopart…
Predicting variations in inductance of an inductor under different dc bias current conditions is investigated for several different magnetic core materials. A method is presented that allows this constraint to be incorporated into the optimization of an inductor for power conversion applications. Theoretical predictio…
In this work, clay-based nanocomposites films were prepared by addition of clay-Na+ natural montmorillonite in pectin and hydroxypropyl methylcellulose (HPMC) matrices. Mechanical (tensile strength, elastic modulus, and elongation) and barrier (Water Vapor Permeability (WVP), and Oxygen permeability (O2P)) properties…
(1- x )(Na 0.5 K 0.5 )NbO 3 – x AZrO 3 (A = Sr, Ca) solid solutions have been prepared to study the effcts of A-site ions on the successive phase transition temperatures. It is found that the phase diagram for the solid solutions are very similar: with increasing x , the cubic–tetragonal phase transition temperature T…
The electronic properties of graphene nanoribbons (GNRs) in the presence of line-edge roughness scattering are studied. The mobility, conductivity, mean free path, and localization length of carriers are analytically derived using an effective mass model for the band structure. This model provides a deep insight into…
Soon after the discovery of carbon nanotubes, it was realized that the theoretically predicted mechanical properties of these interesting structures could make them ideal for a wealth of technological applications. A number of computer simulation methods applied to their modeling, has led over the past decade to an im…
A nanofibrous core-sheath structured scaffold incorporated with bioactive agents is supposed to promote cell migration, proliferation, and gene expressions through the controllable and sustainable release of bioactive agents from the fibers and the preservation of bioactivity. Here we present a novel and effective emu…
The differences in the electronic structure and composition of porous silicon samples obtained under identical conditions of electrochemical etching on the most commonly used n - and p -type substrates with different conductivities are demonstrated by X-ray absorption near-edge spectroscopy (XANES) and Fourier transfo…
We study the characteristics of photogenerated electron–hole plasma in optically pumped graphene layers at elevated (room) temperatures when the interband and intraband processes of emission and absorption of optical phonons play a crucial role. The electron–hole plasma heating and cooling as well as the effect of non…
Time- and temperature-dependent effects are critical for the operation of non-volatile memories based on ferroelectrics. In this paper, we assume a domain nucleation process of the polarization reversal and we discuss the polarization dynamics in the framework of a non-equilibrium statistical model. This approach yiel…
Abstract C–H arylation and homocoupling reactions of 2-formylselenophene were carried out with a palladium catalyst. By using these coupling reactions a seleno-analog of MK dye MK-49, which is an organic dye molecule of a dye-sensitized solar cell (DSSC), was synthesized. The performance of MK-49 as DSSC was compared…
Ti-rich PbZr1−xTixO3 (x = 0.65, PZT65) single crystals with the dimensions of 1 × 1 × 0.2 mm3 were grown by the self-flux method. Micron-sized ferroelectric domains were observed and characterized via piezoresponse force microscopy (PFM) and switching spectroscopy PFM. Both out-of-plane and in-plane components of pola…
Submicrometer-structured (Bi(0.5)Na(0.5))(0.94)Ba(0.06)TiO(3) ceramics ((G) < 720 nm) from nanopowders were studied. The real part of the optimum room temperature set of piezoelectric coefficients obtained from resonances of the BNBT6 dense ceramic disks and shear plates [d(31) = (-37 + 1.33i) pC·N(-1), d(15) = (158.3…