Materials Literature
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The structure and magnetic properties of Sn1−xVxO2 (x=0.02–0.22) thin films fabricated on Si (111) substrate using a sol-gel method and spin coating technique have been investigated. All the samples have pure rutile polycrystalline structure and exhibit room temperature ferromagnetism. The magnetic moment per V reache…
The effect of thickness on the para–ferro-phase transition temperatures, the spontaneous polarization and magnetization and hysteresis loops of 1–3 type multiferroic composite thin films was studied in the framework of Landau phenomenological theory. We took into account the electrostrictive and magnetostrictive effec…
The attenuation (ATT) of hydrogen plasma in carbon nanotubes, grown by iron-catalyzed high-pressure carbon monoxide disproportionate process, is investigated. The effects of the incident wave, the electron density, the collision frequency, the thermal frequency, and the cyclotron frequency on the ATT of the microwave…
The mechanical properties of Fe-Cr alloys were investigated in as-grown and in post-ion-implanted conditions. Sets of specimens were produced using dual implantations of Fe+ ions to give 1µm deep damaged layers with average damage levels of 0.35 displacements per atom and 5.33 displacements per atom. Nanoindentation w…
The novel discrimination method of partial discharges (PDs) based on the analysis of PD pulse waveform with special focus on the rise time is presented. This parameter of PD current pulse has various values for different forms of discharges in insulation systems. The time waveforms and the rise time represent an impor…
The nanocrystalline (mean grain size 20 nm) and microcrystalline magnetoresistive manganites with composition La0.7Ca0.3MnO3 were studied using a four probe electrical resistivity measurement in a strong magnetic field. The room temperature values of electrical resistivity are found to be 20 times larger for the nanoc…
( Pb 1 − x Ba x ) ZrO 3 (PBZ) (0≤x≤0.5) thin films were successfully fabricated on Pt(111)/TiO2/SiO2/Si substrates by the sol-gel technique, and the influence of the Ba2+ content on the microstructure, electrical properties, and phase transformation behavior of PBZ films was investigated in detail. With the increase i…
A top-gate field-effect device with atomic-layer-deposited Al2O3 dielectric was fabricated to investigate magnetotransport properties of two-dimensional electron gas (2DEG) at a semi-insulating ZnO–Mg0.12Zn0.88O double heterostructure grown by laser molecular-beam epitaxy. Hall mobility monotonically increased as the…
The biocompatibility of different commercially available poly(ether)urethane (PUR), medically used as main component for pump chambers of implantable ventricular assist devices (VAD), was evaluated. We investigated the influence of the PUR manufacturing process in an in vitro cytotoxicity screening assay. Human saphen…
SiGe nanocrystals have been formed in SiO2 matrix by cosputtering Si, Ge, and SiO2 independently on Si substrate. Effects of the annealing time and temperature on structural and compositional properties are studied by transmission electron microscopy, x-ray diffraction (XRD), and Raman spectroscopy measurements. It is…
Using a time-dependent density-functional method, we investigated the effect of surface reconstruction in a series of hydrogen-capped silicon nanoparticles of sizes up to 2 nm with different coverage ratios of Si–Si dimers. For the models ranging from perfect bulklike to fully reconstructed configurations, changes in…
An efficient method is developed to achieve improved dispersion of detonation nanodiamond particles in amorphous thermoplastic matrices. For an estimation of the nanodiamond distribution in slices, a method of optical and transmission electron microscopy is used. The complex set of mechanical properties of polymer-nan…
Electron-transfer-induced linkage isomerization was investigated in a series of bis-tridentate Ru polypyridyl complexes [Ru(L-X-OH)(Y-tpy)](2+) with ambidentate ligand L-X-OH=bpy-C(R)(OH)-py (bpy=2,2'-bipyridine; py=pyridine; R=H, Me, Ph, or tBu) and spectator ligand Y-tpy (tpy=2,2':6',2''-terpyridine; Y=p-tolyl, p-Ph…
We consider a phase-field system of Caginalp type on athree-dimensional bounded domain. The order parameter $\psi $fulfills a dynamic boundary condition, while the (relative)temperature $\theta $ is subject to a boundary condition ofDirichlet, Neumann, Robin or Wentzell type. The correspondingclass of initial and boun…
Three-dimensional (3D) GeO 2 nanowire networks were fabricated by using germanium as both a source material and catalyst in an oxygen-rich growth environment. The branches within one network show very regular orientation relationships: either perpendicular or parallel to each other. The nanowires follow a base-growth…
The authors have an extensive study of photoluminescences for Zn-polar and O-polar faces of single-crystalline ZnO bulks. In the photoluminescence (PL) spectra at 10 K, Zn-polar and O-polar faces show a common emission feature: neutral donor-bound excitons and their longitudinal-optical (LO) phonon replicas are strong…
The designed plasma facing materials for the divertor-components in ITER are up to now carbon (graphite or CFC) and tungsten. The heat flux loading can result in temperatures of up to 550°C at the interface between the plasma facing material and the CuCrZr heat sink, an operation temperature which is too high for CuCr…
Free radical polymerization of acrylonitrile with the di-site phase transfer catalyst 1,4-bis(tetramethylhexyl)ethylenediammonium bromide (TMHEDAB) was investigated using the water-soluble initiator PDS (potassium peroxydisulphate) and water-insoluble solvent ethylacetate in an aqueous-organic biphase system at 60±1°C…
Nanocrystalline silicon carbide (SiC) with a diameter of 7 nm was synthesized in a high voltage electrical explosion. It has a larger lattice parameter (0.1%) than its bulk material. Synchrotron x-ray diffraction measurements of nanocrystalline SiC were carried out to 15.8 GPa. The bulk modulus was determined to be K0…
The thermal transport properties-thermal diffusivity, thermal conductivity and specific heat capacity-of potassium selenate crystal have been measured through the successive phase transitions, following the photo-pyroelectric thermal wave technique. The variation of thermal conductivity with temperature through the in…