Оксидні матеріали електронної техніки – отримання, властивості, застосування (OMEE-2012). – 2012 р.
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У збірнику подані розширені тези доповідей Міжнародної наукової конференції "Оксидні матеріали електронної техніки - отримання, властивості, застосування" (OMEE-2012). Конференція присвячена актуальним проблемам технології отримання та дослідження структурних , оптичних, магнітних та електрофізичних властивостей оксидних матеріалів, а також можливості їх практичного застосування у пристроях електронної техніки та розроблення нових функціональних пристроїв на їх основі. Для наковців та аспірантів, які працюють в галузі фізики оксидних матеріалів.
Оксидні матеріали електронної техніки – отримання, властивості, застосування (ОМЕЕ – 2012) : збірник матеріалів міжнародної наукової конференції, 3-7 вересня 2012 року, Львів, Україна / Міністерство освіти, науки, молоді та спорту України, Національний університет “Львівська політехніка”. – Львів : Видавництво Львівської політехніки, 2012. – 305 c.
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Item Зміст до "International Conference on Oxide materials for electronic engineering – fabrication, properties and applications"(Видавництво Львівської політехніки, 2012)Item Influence of NiO reduction on microstructure and properties of porous Ni-ZrO2 substrates(Видавництво Львівської політехніки, 2012) Podhurska, V.; Vasyliv, B.The changes of microstructure, strength, electrical conductivity and fracture micromechanisms of porous YSZ–Ni substrate as anode-supported solid oxide fuel cell (SOFC) material after the treatment in high temperature (600°C) reducing and oxidizing environments have been studied.Item Structure and properties of SOFC electrode materials made from nanopowders(Видавництво Львівської політехніки, 2012) Glazunov, F. I.; Danilenko, I. A.; Konstantinova, T. E.; Glazunova, V. A.; Volkova, G. K.; Burhovetsky, V. V.SOFC composite materials were prepared from nanopowder mixtures of yttria stabilized zirconia - nickel oxide as anode and yttria stabilized zirconia - lanthanum manganite as cathode. The influence of particle size, pore former and sintering temperature on structure and properties of the electrode materials were investigated. The optimal conditions of full reduction of nickel oxide in anode materials were found. Anode material of 55 MPa strength and 38 % porosity was obtained. A SOFC single cell of obtained composite nanopowders was made and tested.Item On the dependence of Ionic conductivity of ScSZ electrolytes on temperature of their sintering(Видавництво Львівської політехніки, 2012) Kyrpa, O.; Vasylyev, O.; Brychevs’kyi, M.; Pryshchepa, E.; Smirnova, A.The dependencies of ionic oxygen conductivity of 10Sc1CeSZ electrolytes made of different zirconia powders those differ by their impurities and production technologies, and sintered in air at different temperatures after uniaxial pressing are analyzed in terms of their Arrhenius equations in 400-900oC temperature range. Deviation from a typical linear dependence of conductivity on temperature that is the most clearly visible in the electrolyte made of the purest powder is observed as a kink on the temperature dependency. A position of the kink point is determined by powder properties and is practically independent on temperature of powder sintering.Item Fractal analysis of surface topography of solid oxide fuel cell materials(Видавництво Львівської політехніки, 2012) Suchaneck, G.; Ponomareva, A. A.; Brychevskyi, M.; Brodnikovskyi, I.; Vasylyev, O.; Gerlach, G.In this work, we investigate the hierarchical surface topography of solid oxide fuel cell electrolytes consisting of zirconia stabilized with 10% Sc2O3 and 1% CeO2 (1Ce10ScSZ) synthesized at 1300-1400 °C and anodes of 60 wt% 1Ce10ScSZ and 40 wt% NiO synthesized at 1250 to 1550 °C. The fractal dimension of AFM images of the films was determined by the cube counting method, the triangulation method and by means of the PSD slope at large wavenumbers. RMS roughness and correlation lengths were derived from the fit to the model PSD.Item Solid-state catalysts based on bentonites and Pd(II)-Cu(II) complexes for low-temperature carbon monoxide oxidation(Видавництво Львівської політехніки, 2012) Rakitskaya, T. L.; Kiose, T. A.; Zryutina, A. M.; Gladyshevskii, R. E.; Truba, A. S.; Vasylechko, V. O.; Demchenko, P. Yu.; Gryschouk, G. V.; Volkova, V. Ya.The results of testing of Pd(II)-Cu(II)/Bent catalyst samples in the reaction of CO oxidation with air oxygen are presented. Bentonites from three Ukrainian deposits: Gorbskoye, Dashukovskoye, and Kirovogradskoye are used as supports. Natural bentonites, their modified forms, and the catalysts have been characterized by X-ray diffraction phase analysis, FT-IR spectroscopy, and chemical analysis. It has been found that the activity of Pd(II)-Cu(II)/Bent catalysts increases with increasing amorphous silica content and with decreasing pH of their water suspensions.Item Structure and gas sensitivity of the ZnO sensor of ethanol(Видавництво Львівської політехніки, 2012) Tsizh, B.; Aksimentyeva, O.; Lazorenko, V.; Chokhan, M.We studied the influence of substrate nature and type of doping on the structure and sensor properties of thin films of ZnO, obtained on the surface of glass, quartz, sital, leuco-sapphire and oxidized silicon by thermo vacuum deposition. With X-ray investigation it shown that the obtained films consist of nanocrystalline zinc oxide, regardless of the nature of the surface, and the best structural perfection characterized ZnO film on the surface of the quartz and glass. The sensitive properties of zinc oxide films to ethanol vapors greatly improved by introducing of doping impurities (Al or In), a highest sensitivity to ethanol was detected for the films of ZnO − Al on the quartz substrate. The proposed sensor can be used to monitor gas environments in the food industry and in the evaluation of alcohol in humans breathing.Item Influence of manganese oxides on the optical absorption and photocatalytic activities of titanium dioxide(Видавництво Львівської політехніки, 2012) Kernazhitsky, L.; Shymanovska, V.; Gavrilko, T.; Naumov, V.; Khalyavka, T.; Kshnyakin, V.Nanocrystalline titanium–manganese mixed oxides (TMMO) with Mn content of 13–16 at. % were first synthesized by manganese hydroxide precipitation on anatase or rutile particles. UV–vis absorption spectra were investigated in 2.4–6.0 eV region and revealed that compared with pure TiO2 the presence of manganese oxides results in an increase of the absorption intensity and significant red shift of the TMMO absorption edge. Photocatalytic activity of pure TiO2, Mn2+ doped TiO2 and TMMO during the photocatalytic decomposition of the safranine dye under UV irradiation was studied. A great improvement of photocatalytic activity is registered for Mn2+-doped TiO2 (anatase and rutile), and rutile-based TMMO sample.Item Lead-free high-temperature barium titanate- based PTCR ceramics and its electrical properties(Видавництво Львівської політехніки, 2012) Plutenko, T. A.; V’yunov, O. I.The (1-x)BaTiO3-x{Na,K}0.5Bi0.5TiO3 solid solutions have been synthesized by solid-state reaction technique. The parameters of the crystal structure of the ceramic samples were determined by means of Rietveld fullprofile X-ray analysis. With increasing x, the values of ρmax and ρmin increase due to the growth of potential barrier at grain boundaries. It has been found that in (1-x)BaTiO3 x{Na,K}0.5Bi0.5TiO3 system the grain boundary and the outer layer region make a contribution to the PTCR effect.Item Oxygen ionic transport in brownmillerite-type Ca2Fe2O5±d and calcium ferrite-based composites(Видавництво Львівської політехніки, 2012) Shaula, A. L.; Kolotygin, V. A.; Naumovich, E. N.; Waerenborgh, J. C.; Pivak, Y. V.; Kharton, V. V.The present work was centered on the studies of oxygen permeability, mixed conductivity, dilatometric behavior, crystal structure and microstructure of Ca2Fe2O5±d and Ca2(Fe,M)2O5±d (M = Co, Mn) solid solutions, and dualphase Ca2Fe2O5 – Ce0.9Gd0.1O1.95 composites. The anisotropic oxygen-ion diffusion in calcium ferrite lattice was simulated using molecular dynamics and atomistic modeling techniques. The computer simulations results were analyzed in light of the experimental data on ionic conduction and thermodynamic stability.Item Lonic transport in anisotropic oxide lattices: in-depth analysis of molecular dynamics data and selected experimental results(Видавництво Львівської політехніки, 2012) Naumovich, E. N.; Patrakeev, M. V.; Shaula, A. L.; Kharton, V. V.The present work is focused on the analysis of oxygen migration processes in layered oxide materials, employing molecular dynamics (MD) simulations validated by various experimental results. In addition to standard MD approaches, a new technique was developed to explore anisotropic diffusion by analyzing transfer between special sites – ion trajectory nodes determined without using crystallographic information on the ideal anion positions. Applicability of this approach was demonstrated by the simulations of anisotropic oxygen transport in La2NiO4+d.Item The structure and Ionic conductivity of Li0.5-yNayLa0.5 {Nb,Та}2O6 system(Видавництво Львівської політехніки, 2012) Kobylianska, S. D.; V’yunov, O. I.; Gavrilenko, O. N.; Belous, A. G.We have synthesized Li0.5–yNayLa0.5 Nb2O6 and Li0.5-yNayLa0.5 Ta2O6 defect perovskite solid solutions with 0 < y ≤ 0.5. Lithium ion diffusion in the investigated system exhibits no percolation effect. In the Li0.5-yNayLa0.5 Nb2O6 system, the ionic conductivity as a function of sodium content has a maximum due to two competing factors: the increase in perovskite cell volume and the decrease in lithium ion concentration. The ionic conductivity of Li0.5-yNayLa0.5 Ta2O6 samples decreases with sodium content.Item Diagram of the magnetic state of real fine particle system of Ca0.5Ba0.5Fe12O19(Видавництво Львівської політехніки, 2012) Mozul, K.; Ol'khovik, L.; Sizova, Z.; Shurіnova, O.A magnetic state of real system of biocompatible particles Ca0.5Ba0.5Fe12O19 with a quite wide size distribution within the single domain limit was studied in this paper.Item Structural and magnetic properties of sintered materials on the basis of zinc oxide(Видавництво Львівської політехніки, 2012) Kurilo, I.; Lopatynskyi, I.; Rudyi, I.; Fruginskyi, M.; Vir, I.; Pavlovskyi, Yu.; Tsmots, V.; Hadzaman, I.; Havrylziv, A.Structural and magnetic properties of ceramics Zn1-xCoxO and Zn1-xCrxO are studied. Average sizes of grains are determined by scanning electron microscopy. The magnetic field dependences of magnetic susceptibility are investigated by Faraday method. The relevant theoretical models are chosen.Item Effect of high uniaxial magnetocrystalline anisotropy on spectrum of hexagonal ferrite films: static and dynamic problems(Видавництво Львівської політехніки, 2012) Grigoryeva, N.; Sultanov, R.; Polishuk, E.; Kalinikos, B.The investigation of the relation between the form of the hybrid electromagnetic-spin-wave spectrum of the hexaferrite film and the mutual orientation of the anisotropy axis and the external bias magnetic field is presented. The investigation covers the solution of both static and dynamic problems. The obtained spectrum of hybrid electromagnetic-spin waves shows a strong dependence on the mutual orientation of the anisotropy axis and the external bias magnetic field. For several special cases the hybrid waves propagating in the hexaferrite film show simultaneously dispersion properties of different types for different spin-wave modes, i.e one and the same spin-wave spectrum contains dispersion branches having different signs of phase velocity.Item Thickness-dependent magnetotransport properties of La0.6Sr0.2Mn1.2O3 films on SrTiO3 and LaAlO3 substrates(Видавництво Львівської політехніки, 2012) Tovstolytkin, A.; Polek, T.; Matviyenko, A.; Zakharenko, M.; Semen’ko, M.; Pashchenko, A.Electric and magnetoresistive properties of La0.6Sr0.2Mn1.2O3 films deposited on SrTiO3 (001) and LaAlO3 (001) single crystalline substrates by magnetron sputtering have been studied. Characteristic features of the evolution of resistivity, magnetoresistance and Curie temperature upon the decrease of film thickness from 500 to 12.5 nm are specified. A key role of a thin strained layer adjacent to the substrate is demonstrated. The critical thicknesses of the strained layer are calculated for the films deposited on different substrates.Item Peculiar features of magnetic and resistive transitions in partially crystallized La0.84Na0.16MnO3 films(Видавництво Львівської політехніки, 2012) Pan’kiv, L.; Tsmots, V.; Pan’kiv, I.; Tovstolytkin, A.; Matviyenko, A.The present work aims to study magnetic, electric, magnetoresistance and resonance properties of partially crystallized La0.84Na0.16MnO3 thin films. Peculiar behavior resulting from the wide-range coexistence of highly conductive ferromagnetic and weakly conductive paramagnetic phases has been analyzed. Based on the results of magnetic measurements and theoretical calculations, the dependence of the volume fraction of ferromagnetic phase, VFM, on temperature is calculated. The VFM values whereby electric resistance and magnetoresistance display maxima are determined.Item Growth peculiarities and magnetic properties of (LuBi)3Fe5O12 films by LPE method(Видавництво Львівської політехніки, 2012) Syvorotka, I. I.; Syvorotka, I. M.; Ubizskii, S. B.The series of (LuBi)3Fe5O12 film were grown on (111) oriented GGG substrate with diameters 1, 2 and 3 inch by liquid phase epitaxy using Bi2O3-base flux. Different types of surface morphology on the grown films were observed. The films’ surface was smooth and mirror while the film thickness was less than 13 μm and becomes rough for thickness above this value. The grown films were characterized by measuring magnetization loops and magneto-optic Faraday rotation under magnetization reversal as well as ferromagnetic resonance (FMR). All films with mirror surface demonstrate the in-plane magnetization, high Faraday rotation and FMR linewidth about 0.8 Oe at 9.1 GHz and room temperature.Item Structural and magnetic characterization of functional surface coated maghemite nanoparticles(Видавництво Львівської політехніки, 2012) Demchenko, P.; Mitina, N.; Zaichenko, A.; Nedelko, N.; Lewińska, S.; Ślawska-Waniewska, A.; Dłużewski, P.; Bilska, M.; Ubizskii, S.Nanoparticles composed of magnetic γ-Fe2O3 core and organic shell were synthesized via template synthesis in the presence of functional oligoperoxide surfactants and further graft-polymerization initiated from their surface. X-ray diffraction (XRD), transmission electron microscopy (TEM) and magnetic measurements (PPMS) were used to characterize the obtained magnetic system of core-shell nanoparticles. XRD results confirm the existence of γ-Fe2O3 phase as well as show an average diameter of nanoparticles around 10 nm. The obtained particles are superparamagnetic at the room temperature. Magnetic measurements indicate also sufficiently strong dipolar interparticle interactions at low temperatures.Item Thick epitaxial YIG films with narrow FMR linewidth(Видавництво Львівської політехніки, 2012) Syvorotka, I. I.; Syvorotka, I. M.; Ubizskii, S. B.The La-doped yttrium iron garnet (YIG) films with thickness up to 130 μm were grown by liquid phase epitaxy (LPE) method. All grown thick films demonstrate “mirror” and “striation” types of surface morphology that depend from film growth temperature and thickness. Addition of B2O3 is favourable to a change the surface morphology into a “mirror” one. The mechanisms of the morphological changes are discussed. It was found that the ferromagnetic resonance (FMR) linewidth appreciably depends from surface morphology of grown films. For thick films with “mirror” surface the FMR linewidth is less than 0.8 Oe and more than ten times less in comparison with films with “striation” surface.