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The following topics are dealt with: microstructure; nanostructure; radio system; television system; radiolocation; telecommunications; sonic device; ultrasonic device; physics; electronics; optical device; thermal device; power electronics; mechatronics; and automation.
The effect of ion beam irradiation on nucleation and growth of three-dimensional (3D) Ge islands on Si (100) substrate was investigated. It was found that pulsed ion-beam action during heteroepitaxy leads to the increase of 3D islands density, decrease of their size and improvement of the size uniformity. To reveal the mechanisms of observed effects Monte Carlo simulation was made. It was shown that...
Electron paramagnetic resonance and spin echo methods are used to probe the spin dynamics in two-dimensional quantum dot (QD) arrays with different shape of nanoclusters. Two types of QD structures were investigated: 1) with single shaped QDs (hut-clusters having the ratio of height h to lateral size l, h/l = 0.1), and 2) with two groups of QDs, hut- and dome-clusters (h/l = 0.2). Both types of structures...
Equipment and methodology aspects of precision nano-thick film growth by consecutive gas pulsed chemical vapor deposition (CVD) technique at low temperature are analyzed. The main parameters of repeatable pulsed CVD processes include the deposition chamber time constant, gas pulse shape and characteristics, cycle design and reactant pulse durations, substrate exposure characteristics, and substrate...
Surface enhanced Raman scattering is studied in nanostructures with GaN and ZnO nanocolumns. Features related to optical phonons of nanocolumns are observed in the Raman spectra of both free-standing GaN and ZnO nanostructures. Strong enhancement of the Raman scattering intensity by surface optical phonons in GaN and ZnO nanocolumns is observed by deposition of silver clusters onto the nanostructure...
The effect of Ar low-temperature electron cyclotron resonance plasma on a growth of lead phthalocyanine films has been investigated by means of RHEED, AFM and IR spectroscopy. It has been found that at low intensity of the plasma assisting the films are subjected to a structural transformation that are similar a vacuum annealing. As the intensity of the assisting is increased, the growth of polymer...
The α-PbPc thin films are formed by deposition from Knudsen cell in high vacuum. The reproductive switching conductivity effect has been obtained by using AFM with a conductive probe. The switching effect has been obtained on a sandwich-type structure, too. Volt-ampere characteristics are measured on sandwich-type structures in vacuum condition under temperature 323 - 413 K range. A model of conductivity...
The work is devoted to investigation of early stages of GaAs oxidation in glow discharge plasma, using X-ray photoelectron spectroscopy (XPS) in-situ. The chemical composition and oxide film thickness were measured at different stages of oxidation without exposition of the sample to laboratory atmosphere. After plasma activation a two layer oxide film is formed on the preliminary cleaned GaAs surface...
Rubidium neodymium molybdate, RbN(MoO4)2 has been synthesized by solid state reaction at T = 350°-600°C for 50 h in air. Morphology of RbNd(MoO4)2 micrograins has been observed with SEM. Phase purity of final product is confirmed with XRD analysis. Crystal structure related to KY(MoO4)2-type, space group Pbcn, is supposed by XRD pattern comparison.
XPS measurements were carried out on Sr2Nb2O7 and Sr2Ta2O7 powder samples, which were synthesized using standard solid state method. The binding energy differences between the O 1s and cation core level, Δ(O-Sr) = BE(O 1s) - BE(Sr 3d5/2), was used to characterize the valence electron transfer on the formation of the Sr-O bonds. The chemical bonding effects were considered on the basis of our XPS results...
Dispersion of refractive index and extinction coefficient of nickel film and nickel crystal surface (100) has been determined with spectroscopic ellipsometry over spectral range λ ~ 250-1030 nm. Nickel film has been prepared by thermal evaporation method. Nickel crystal has been grown by horizontal Bridgman method. The crystal surface (100) at a first stage was mechanically polished and then treated...
The distribution of 46 acentric bismuthates over different crystal systems and space formations of Bi-O polyhedrons have been revealed. The dependence of polyhedron space formation on stoichiometric ratio n(O)/n(Bi) in the compound is established. Individual (Bi-O) octahedrons are found for n(O)/n(Bi) > 5 (and >3 for low coordinated bismuth), chains and layers are revealed for the range 2.0-5...
The distribution of 150 presently known acentric borates over different crystal systems has been revealed. The rules for generation of boron-oxygen fundamental building blocks, three- and tetra-coordinated boron are specified.
The specifics of temperature investigations of impedance and magnetoimpedance effect in amorphous and nanocrystalline magnetic soft materials have been carried out. It is shown that it is necessary to take into account the influence of thermo-stress factor on impedance and magnetoimpedance effect in these materials. The appliance of suitable composition materials as sensitive elements in GMI-based...
The soft heat treatment influence on magnetoimpedance properties of amorphous soft magnetic Co66Fe4Nb2.5Si12.5B15 wires has been researched. It is shown that changes of magnetoimpedance properties allow detecting the structural relaxation processes in the amorphous magnetic soft alloys.
Nanocomposites on the basis of CNT layers and nonstoichiometric tin dioxide (CNT/SnOx) have been obtained. Gas sensitivity to ethanol (C2H5OH) and nitrogen dioxide (NO2) vapor at the room temperature has been established.
The process of Si-Ge heterostructures formation in nanowhiskers (NWs) grown by the vapor-liquid-solid mechanism was investigated using Monte Carlo simulation. It was demonstrated that it is impossible to grow atomically abrupt axial heterojunctions via classical vapor-liquid-solid mechanism due to gradual change of catalyst drop composition when switching the fluxes. Dependences of GexSi1-x composition...
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