PCSS, V.13, №4, 2012

Abstracts

V.I. Boichuk, V.B. Hols'kyi, R.Ya. Leshko, I.O. Shakleina

Absorptance Light Double Layer Quantum dot, Which Has a Form Pull Spheroid

Ivan Franko Drohobych State Pedagogical University, Institute of Physics, Mathematics and Computer Science

We investigated the energy spectrum of an electron in a core-shell prolate spheroidal quantum dot heterosystem SiO2/Si/SiO2. We used an infinite confining potential well to obtain energy levels and wave functions of an electron. Twelve lowest states are considered. A dipole momentum of the transition as a function of the quantum dot outer layer for plainly and circularly polarized light is found. The absorption coefficient as a function of the incident electromagnetic wave is shown. The comparison of absorption coefficients in spheroidal and spherical core-shell nanoheterosystems is made.

B.M. Ruvinskii¹, M.A. Ruvinskii²

Influence of Classical Dimensional Effects on Interband Dynamic Conductivity of Straight-Line Graphene Ribbon

¹ Ivano-Frankivsk National Technical University of Oil and Gas, 15, Carpatska Str., Ivano-Frankivsk, 76000, Ukraine,
² Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine bruvinsky@gmail.com

The influence of specular-diffuse reflection mechanism for charge carriers on the interband dynamic conductivity of plane straight-line graphene wire has been investigated theoretically (the wire length is much greater than its width)/ The comparison with corresponding influence on the intraband conductivity has been fulfilled. The influence of classical dimensional effects for the interband current has been revealed in the cubic approximation on amplitude of the alternating voltage.

D.M. Stepanchikov¹, G.P. Chuiko²

Exciton Spectra and Band Structure of Semiconducting Solid Solutions of the Zn₃P₂ - Cd₃P₂ System

¹Kherson National Technical University, Department of General and Applied Physics, Laboratory of Solid State Theory,
Beryslawske Shosse, 24, 73008, Kherson, Ukraine, e-mail:step_75@mail.ru
²Petro Mohyla Black Sea State University, Department of Medical Devices and Systems, 10, 68 Desantnikov str., 54003, Mykolaiv, Ukraine

The band structure of (ZnxCd1-x)3P2 semiconductor solid solutions is considered within the framework of generalized Kildal’s band model. Analytical dependencies of band parameters on a composition x are proposed. The energy levels of free excitons and exciton-impurity complexes in (ZnxCd1-x)3P2 solid solutions are calculated by variational method. Screening effects have been taken into account using the modified Coulomb potential with dielectric function depended on distance between electron and hole. A theoretical analysis is developed for ascertaining the influence of exciton states on luminescence spectra. Comparison of theoretical and experimental results is presented.
Keywords: exciton, exciton-impurity complexes, zinc (cadmium) phosphide, Kildal’s band model, luminescence.

P.O. Gentsar, O.I. Vlasenko, S.M. Levytskyi, V.A. Gnatiuk, M.S. Zayats, O.M. Strilchyk, Yu.M. Nasieka

Optical Properties of High-Resistance CdTe Single Crystals and Cd_1-xZn_xTe Solid Solution

V. Lashkаryov Institute of Semiconductor Physics, prospect Nauki, 41, Kyiv, 03028 E-mail: rastneg@isp.kiev.ua

In this work optical properties (transmission ranges in a range of 800 – 1100 nm, transmission and reflection ranges in a range of 1,4 – 25 μm and photoluminescence ranges are investigated at T = 5 K in a energy range 1,35 - 1,7 eV) high-resistance monocrystals of CdTe (111) with resistivity ρ = (2 ÷ 5) 109 Ω•cm alloyed by chlorine, and Cd1-xZnxTe (x=0,1) with resistivity ρ = 5•109 Ω•cm - 3•1010 Ω•cm. Definitely that fundamental optical transition Е0 for CdTe at 300 K equals 1,44 eV and 1,5 eV for Cd1-xZnxTe, and temperature factor of change of width of the forbidden zone equal : 5,32 ( 10-4 for CdTe and - 5,2 ( 10-4 for Cd1-xZnxTe.
Keywords: CdTe, Cd1-xZnxTe, optical properties.

Z.P. Chornij¹, I.B. Pirko², V.M. Salapak¹, N.V. Djachuk¹

Color Centers in CaF2-Na and CaF2-Lі crystals. I. Results of Experimental Research

¹Department of Physics, National Forestry University of Ukraine, 105 Gen. Chuprynky St., Lviv, 79057, Ukraine
²Department of Computer Engineering and Modeling Processes, National Forestry University of Ukraine, 103 Gen. Chuprynky St., Lviv, 79057, Ukraine, e-mail:pirko1966@mail.ru

The spectra of absorption, ion termo inductive current and thermally conversion of color centers in crystals of CaF2-Na and CaF2-Li, X-rays were investigated. It is established that the structure of color centers in crystals fluorites depends on irradiation temperature crystal. If to irradiate the crystal at the T < 200 K, (FA-VKD) are generated in it, and if the is T> 250 K - (MA+-VKA)-complementary pairs of coloring centers are generated. Thermoactivating transformations of coloring centers happen within temperature range 210-230 K and are caused bythermo-activating digression of anion vacancy from the hole center (VKD ( VKA + VA) with the consecutive holding it bu FA-center (VA + FA ( MA). It was demonstrated that the radiation sensitivity of fluoride crystals is determined by the concentration of legging additives ans irradiation temperature of the crystal. Keywords: fluorite, impurity-vacancy dipoles, color centers, thermally depolarization.

B. K. Ostafiychuk, I. P. Yaremiy, S. I. Yaremiy, U. O. Tomyn, M. M. Umantsiv

Analysis of the Defect Structure of Ion-Implanted Single Crystal Layers

Vasyl Stefanyk Precarpathian National University, 57, Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine, e-mail:sofiya.yaremiy@rambler.ru

Method of defect parameters determination in ion-implanted single crystal layers, rocking curves of which have an additional oscillating structure with length to a few degrees, was proposed. Most sensitive to defects parts of rocking curves was found and it was shown, that the using of reflections with small and large values of the static Debye-Waller factor makes it possible to uniquely identify the type and characteristics of the defects in the disturbed layer.
Keywords: ion implantation, dynamical theory of X-ray scattering, deformation profile, amorphization.

Y.S. Nykyruy¹, S.I. Mudryi¹, A.K. Borysyuk²

Effect of Laser Irradiation on the Structure and Properties of Amorphous Alloy Fe_73.5Nb₃Cu₁Si_15.5B₇₁

¹Lviv Ivan Franko National University, Lviv
²National University "Lviv Polytechnic", Lviv

Structure variation in Fe73.5Nb3Cu1Si15.5B7 amorphous alloy induced by the pulse laser irradiation has been studied by means of X-ray diffraction method and by means of microhardness and magnetic properties measurements. Structure parameters, estimated from diffraction patterns are analyzed. It is shown that laser irradiation promotes the relaxation of structure and formation of clusters with crystal-like structure.
Keywords: laser annealing, nanoclusters, amorphous alloys.

A.Z. Kulyev¹, D.M. Freik2, F.K. Aleskerov¹, H.T. Ahmedli³, S.A. Nasibova¹, E.M. Maherramov⁴

Surface Phases on (0001) Bi₂Te₃

1NPO "Selenium" ANAS, Azerbaijan, Baku 2Vasyl Stefanyk’ Precarpathian National University, 3Azerbaydzhansky Medical University, Baku 4Bakinsky State University, Baku, e-mail:seyyare.nabiyeva @ mail.ru

The morphology of the surface (0001) Bi2Te3 formed by diffusion transport of atoms Se and Ge in the space Te(1)-Te(1). AFM images showed the equilibrium shape of nanoparticles as Se and GeTe, and vicinal phase of GeSe2. Since the diffusion processes taking place in an isolated environment, the stability of the formed phases and their properties are maintained.
Keywords: morphology, diffusion, migration, vicinal, phase, quintets, nano-objects, crystallization, surface, stage.

V.O. Zabludovskiy, V.V. Dudkina

Effect of Laser Radiation on the Kinetics of Electrocrystallization Films of Nickel and Zinc

Dnepropetrovsk National University of Railway Transportthem. Ukraine

In the framework of classical nucleation theory and the Zel'dovich mechanism for direct connection of the adsorbed atoms studied the kinetics of formation and growth of surface nucleation in laser-stimulated electrodeposition. The values of the rate of formation of surface nucleation and growth modes for the electrodeposition of films of nickel and zinc using direct current in the external stimulation of the laser radiation.
Keywords: laser-stimulated electrodeposition, the cathodic potential, crystallization overvoltage, the nucleation rate, the rate of growth of crystallites.

O.M. Bordun, I.Yo. Kukharskyy, V.G. Bihday

Cathodoluminescence of Thin Films Based on ZnGa₂O₄

Ivan Franko Lviv National University, 50, Dragomanov Str., Lviv, 79005, Ukraine, e-mail:bordun@electronics.wups.lviv.ua

Thin films of ZnGa2O4, ZnGa2O4:Mn, ZnGa2O4:Cr were received by RF-sputtering. Cathodoluminescent properties of this films were investigated. Findings of luminescence spectrum measuring show that received films can be used as phosphor of blue (ZnGa2O4), green (ZnGa2O4:Mn) and red (ZnGa2O4:Cr) glow colors. It was shown, based on heat treatment of films in oxygen and anoxic atmospheres, that luminescent centers in ZnGa2O4 films include oxygen vacancies. For luminescent centers analyzing oxianions (GaO6)9– were used in which Ga3+ ions in complex with neighbour oxygen vacancy, that took two electrons, considers as mercury-like Ga+–center. Dependence of luminescence intensity from electron bean current density was investigated.
Keywords: zinc gallate, thin films, cathodoluminescence, spectra.

I.M. Pazukha, I.Yu. Protsenko, Yu.M. Shabelnyk

Magnetoresistive Properties of Granular Films Baced on Ag and Co

Sumy State University, 2, Rimsky-Korsakov Str., Sumy, 40007, Ukraine, protsenko@ahp.sumdu.edu.ua

The analyses experimental data of magnetoresistive properties of granular films based on Ag and Co were presented. The magnetoresistance dependence on thermal treatment, magnetic component concentration and others factors was analyzed. The comparison of the experimental data of magnetoresistance effect investigation with literary data was presented.

M.D. Boochkovska

The Effect of Stibium Underlayers on Percolation Threshold in Copper Film

Ivan Franko national university of Lviv 50 Dragomanov street, Lviv, 79005

The process of metal conductivity formation in thin metal films deposited on glass substrate and glass substrate predeposited with stibium underlayers under ultra high vacuum conditions was investigated. The current flow percolation in as deposited metal film was established. Size dependencies of conductivity were explained in the framework of modern electron transport models in samples of limited dimensions. The correlation between metal film structure and electron transport properties (average linear crystalline size D in the plane parallel to substrate, average amplitude of surface asperities h, percolation threshold dc and electron transport constants) were established. Stibium underlayers forward 2D growth mechanism in metal film.
Keywords: thin metal film, percolation theory, classical size effect.

V.M. Pylypiv¹, V.О. Kotsubynskii¹, B.K. Оstafiychuk¹, О.Z. Garpul¹, Artur Blachowski², Krzysztof Ruebenbauer², Jan Zukrowski³, V.V. Prokopiv¹

Comparative Analysis of Disordering of the Crystal and Magnetic Microstructures Surface Layers of YIG Films Implanted by Ions Fluorine and Silicon

¹Precarpathion national University named after Vasyl Stefanyk, 57 Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine
²Moessbauer Spectroscopy Laboratory, Pedagogical University, PL-30-084 Kraków, ul. Podchorazych 2, Poland
³Solid State Physics Department, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology PL-30-059 Kraków, Al. Mickiewicza 30, Poland, ogorishna@ukr.net

The comparative analysis of the processes of radiation disordering the structure of the surface layer epitaxial iron-garnet (YIG) and its magnetic microstructure Implanted F+ and Si+ with an energy of 90 keV and doses of 1 • 10¹³, 6 • 10¹³ and 1 • 10¹⁴ cm^-2. The theoretical results modeling the distributions of energy losses ions implants probability of formation of secondary displacement cascades, profiles of structural disorder compared with the results of processing the experimental conversion electron of mossbauer (CEM) spectra.
Keywords: yttrium-iron garnet, ion implantation, conversion electron Mossbauer spectroscopy.

B.I. Turko, Y.I. Elijashevskyy, V.B. Kapustianyk, O.P. Krehel

Dielectric Dispersion of The Nanostructured Polycrystalline Zinc Oxide Films

Scientific-Technical and Educational Center of Low Temperature Studies, Ivan Franko National University of Lviv 50, Dragomanova Str., Lviv, 79005, Ukraine

Study of the dielectric properties of polycrystalline zinc oxide films in a wide range of frequencies and temperatures were performed taking into account the impact of the technological factors. The low and high-frequency dielectric relaxation processes in nanostructured ZnO films have been investigated. The nature of the low frequency relaxation process is connected with volume charge polarization on the grain boundary, which becomes electrically active due to appearance of the high concentration of defects at the interface volume of nanostructured ZnO in comparison with a bulk material. The high-frequency dielectric relaxation process occurs due to the thermal polarization process involving the electrons localized on the oxygen vacancies.

D.M. Freik¹, Ya.S. Yavorskiy¹, I.S. Bylina¹, P.М. Lytvyn², І.М. Lishchynskiy¹, V.B. Marusyak¹

Topology, the Mechanisms of Nucleation and Growth Processes of Nanostructures in Vapor-Phase Condensates PbTe: Sb on Chipped Mica

¹Vasyl Stefanyk Precarpathian National University, 57, Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine, Е-mail: freik@pu.if.ua
²V. Lashkаryov Institute of Semiconductor Physics, prospect Nauki, 41, Kyiv, 03028, Ukraine, Е-mail: plyt@isp.kiev.ua

The results of investigations of the structure formation processes in condensates PbTe:Sb/(0001) mica-muscovite obtained by open evaporation in vacuum at temperatures of deposition ТS=(150-250) ºС and deposition time τ = (15-300) s. It is shown that the dominant mechanism is the origin Folmer-Weber in the implementation stage of nucleation islands, their aggregation and coalescence. The process of growth nanoformations explained in approaching Ostwald maturation, which is dominated by volume diffusion. Formed nanostructures of PbTe represent trigonal pyramids facets {100} and the foundation (111) parallel to the substrate surface.
Keywords: nanostructures, vapor-phase techniques, thin films, lead telluride, emergence, growth.

G. Il’chuk¹, V. Kusnezh¹, R. Petrus’1, S. Tokarev¹, O. Tuziak²

Fabrication and Optical Properties of the Gold Nanoparticles Array on Glass Slides

¹Lviv Polytechnic National University, physics department, 12 S. Bandera Str., Lviv, 79013, Ukraine,
²Ivan Franko National University of Lviv, solid state physics chair, 50 Dragomanova Str., Lviv, 79005, Ukraine, gilchuk@polynet.lviv.ua

The arrays of gold nanoparticles on glass substrates were fabricated by thermal annealing (400 ºC, 60 and 120 min.) in vacuum (P ~ 1,3 Pa) of thin gold films with 25 and 100 nm thickness obtained by magnetron and thermal sputtering. The structure, surface morphology and optical properties were investigated by optical and scanning electron microscopy. The sizes of nanoparticles were experimentally determined.
Keywords: metallic films, gold nanoparticles, optical properties, thermal annealing.

V.M. Zhurovetski¹, B.P. Kovalyuk², V.S. Mocharskyi², Yu. Nikiforov², V.V. Onisimchuk¹, D.I. Popovych^1,3, A.S. Serednytski¹

Structure and Photoluminescence Modification of ZnO Nanopowders by the Laser Shockwave Treatment

¹Institute of Applied Problems of Mechanics and Mathematics NASU,3b, Naukova Str., Lviv 79060, Ukraine, E-mail:onisimchuk2info@gmail.com
²Ternopil’ Ivan Pul’uj National Technical University, Ternopil’ 46000, Ukraine 3National University “Lvivska Polytechnika”, Bendera Str. 12, Lviv 79013, Ukraine

Modification of ZnO nanopowder was held by laser shockwave treatment and examined peculiarities of such impact with the energy density order ~108-109 W/sm2. Properties of ZnO nanopowders were characterized by means X-ray diffraction analysis (XRD), scanning electron microscopy and also by Gaussian decomposition of photoluminescence spectra. The XRD results revealed that sample of ZnO nanopowder was crystalline with typical hexagonal wurtzite phase. Laser shockwave treatment helped significantly reduce the aggregation level of nanopowders. Photoluminescence spectra modification of treated samples was revealed. Decreasing intensity of green photoluminescence band was observed while intensity of the peak λ=430 nm increased when air pressure decreases to 7 Pa. Observed changes of visible emission are characterized with defect structure modification, especially oxygen defects.

S.V. Fadeyev¹, N.N. Berchenko^1,2

Comparative Analysis of Lead Chalcogenides Under Thermal Oxidation

¹ Lviv Polytechnic National University, Bandera str.,12,Lviv,79013, Ukraine, e-mail:fadeyev.serzh@ ukr.net
²Rzeszow University, Poland

The phase compositions of the lead teluride and lead selenide samples upon oxidation in dry air at 400oC are studied using X-ray diffractometry. It is concluded that only the ternary oxides PbTeO3 and PbSeO3 respectively are formed at this temperature. For PbTe also the phase transformation from α to tetragonal are observed . It is interesting to note that in this temperature range, the composition of the oxide and the rate of growth of the oxide layer correlates well with the reactivity of these compounds at the interaction with molecular oxygen, estimated on the basis of quantum-chemical modeling.

М.B. Konyk, L.P. Romaka, V.V. Romaka, R.Ya. Serkiz

Interaction of the Components in Er-Mn-Ge Ternary System at 870 K

Ivan Franko National University of Lviv, Kyryl & Mephodiy Str., 6, 79005, Lviv, Ukraine cNational University “Lvivska Politechnika”, Bandera str. 12,79013, Lviv, Ukraine

Isothermal section of the Er – Mn - Ge ternary system was constructed using X-ray analysis and scanning electron microscopy at 870 К. Four ternary compounds exist at investigated temperature: ErMn6Ge6 (HfFe6Ge6-type, space group P6/mmm), ErMn2Ge2 (CeGa2Al2-type, space group I4/mmm), ErMn1-xGe2 (CeNiSi2-type, space group Cmcm), ErMnGe (TiNiSi-type, space group Pnma). For ErMn1-хGe2 germanide the homogeneity range was established (х = 0,68 - 0,61, a = 0,4081(7) - 0,4084(2), b = 1,5628(2) - 1,5641(9), c = 0,3966(7) - 0,3974 nm), the electrotransport properties, magnetic susceptibility were investigated in the temperature range 80 – 380 К and 290 -870 К, the easy axis magnetizing direction was determined. Electronic structure calculations for ErMnGe compound were performed using CPMD method and indicated metallic state for this compound.
Keywords: ternary system, crystal structure, thermopower, electrical resistivity, easy magnetization axis, electronic structure.

D.M. Freik, G.Ya. Gurgula, T.P. Vintonjak, B.P. Volochanska

Mechanisms of Crystals-Chemical Interaction of Zinc Telluride Crystals with Oxygen ZnTe:O

Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., Ivano-Frankivsk, 76018, Ukraine, E-mail:freik@pu.if.ua

The crystals-quasi-chemical formulas and dominant point defects in doping crystals ZnTe:O was determinate. The concentrations of defects, free charge carriers and Hall’s concentration due composition was calculate.

N.Yu. Philonenko, Ye.Yu. Beryoza, A.S. Baskevich

Study of Energy in Communication Formation of Phase Containing Boron in the Alloy Fe-BC

Dnepropetrovsk State Medical Academy 4, Oktyabr’skaya Square, Dnepropetrovsk, Ukraine, UA-49050, natph@mail.ru

The paper examined the morphology and mechanism of formation of multiphase inclusions in alloys of Fe-B-C. The value of binding energy calculated using quantum mechanical calculations. The results showed that the energy of Fe-B more energy of Fe-C. Shown that in the center of multiphase inclusion formed boride Fe2B, surrounded phase Fe3(CB), and outer shell - Fe23(CB)6.
Keywords: multiphase inclusions, binding energy, iron boride Fe2B, boron cementite Fe3(CB) and cubic boron carbide Fe23(CB)6.

L.D. Yurchushun

Enthalpy of Formation of Impurity-Vacancy Complexes in the Crystals of Compounds A4B6

Physicochemical Institute, Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., Ivano-Frankivsk, 76018, Ukraine, e- mail: goritchok@rambler.ru

Determined the enthalpy of formation of complexes of point defects consisting of impurity atom substitution and vacancies in the neighboring node. The calculation was carried out for crystals GeTe, PbTe doped elements third (Ga, In, Tl), fifth (Sb, Bi) and seventh (Cl, Br, I) groups of the periodic table. Based on the results of the comparative analysis of the probability of formation of these complexes in the crystals of compounds A4B6.

I.V. Fesych, S.A. Nedilko, A.G. Dziazko, V.V. Boklashchuk

Influence of Y/Cs Heterovalent Substitutions on Properties and Oxygen Nonstoichiometry of Complex Yttrium Cuprates

Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska str., 01601 Kyiv, Ukraine, e-mail:fesych@univ.kiev.ua

New yttrium cuprates of Y3-xCsxBa5Cu8O18+δ (0≤x≤0,2) have been synthesized by means of solid state interaction. Such compounds as yttrium and copper oxides as well as cesium and barium carbonates were used for the synthesis procedure. It was found, that the field of solid solutions of Y3-xCsxBa5Cu8O18+δ system is within the interval of (0≤x≤0,1). Cesium cuprate is formed as additional phase at high х values. Single-phase samples are characterized by orthorhombic unit cell (Pmm2). Partial heterovalent substitution of Y/Cs results in increase of total oxygen index, average degree of oxidation and Cu3+ content. Superconductive properties of cesium-containing samples are comparable with those for non-substituted Y3Ba5Cu8O18+δ (Y-358) in the field of homogeneity.
Keywords: cesium-containing complex cuprates, superconductivity, oxygen nonstoichiometry.

I.O. Korbut, D.D. Naumova, S.A. Nedilko

Influence of Substitution in HTSC Phases Bi₂Sr₂CaCu₂Oy і Bi₂Sr₂Ca₂Cu₃Oy of Bismuth by Thallium

Kyiv Taras Shevchenko National University, chemical department 01601, Kyiv, Volodymyrska str., 64/13, 044-239-33-06 e-mail:abserber@mail.ru

High temperature superconductors Bi2-xTlxSr2CaCu2Oy and Bi2-xTlxSr2Ca2Cu3Oy (0 ≤ х ≤ 0,5) were synthesized according to the research results. The homogeneity region, change of unit cell parameters were determined. The transition temperature in superconducting state exceeds 80 К.

A.V. Byakova¹, A.A. Vlasov¹, A.A. Scheretskiy²

The study of Phase and Structural Transformation in Nanocrystalline Al-Fe-Cr Alloys Using Simultaneous Thermal Analysis

¹Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanovsky St., 03142, Kiev, Ukraine; Е-mail: byakova@mail.ru, +380444238253 ²Physical-Technological Institute of Metals and Alloys, National Academy of Sciences of Ukraine, 34/1Vernadskogo ave., 03142 Kiev, Ukraine

Phase and structural transformation under heating of powdered nanoquasicrystalline Al94Fe3Cr3 alloy produced by atomization with high pressure (P=10 MPa) water have been examined by means of developed precise method of simultaneous thermal analysis and confirmed by the results of X-ray diffraction analysis. Temperature intervals for physical and chemical processes, which result in the change of mass and corresponded heat reactions have been found and discussed. According to the data obtained in the present study structural evolution is accompanied by dehydration of aluminium hydroxide presented in form of Al2O3•nH2O amorphous layer and sited on the surface of the powder particles and pores within their interior. Dislocation reorganisation and recrystallisation of the 0-Al solid solution occur under heating the quasicrystalline powder prior transformation of icosahedral quasicrystalline particles of i-phase into conventional crystalline compounds compositionally corresponded to metastable Al6Fe phase and stable -phases such as 0- Al13Cr2 and 0- Al13Fe4.

R.M. Balabai, E.N. Chernikova

Influence of The Presence of Chromium Atom on the Si Film Oxidation

Krivoi Rog State Pedagogical University, Department of Physics, 54 Prospect Gagarina, Krivoi Rog, Ukraine, 50086, e-mail:oks_pol@cabletv.dp.ua.

To elucidate microscopic mechanisms accelerate oxidation of Si in the Cr monolayer presence was carried out theoretical studies of atomic oxygen interaction with a thin film of silicon atoms in the Cr presence. Methods of electron density functional and pseudopotential derived from first principles density distributions of valence electrons and electronic energy spectra for thin film silicon in the presence of a monoatomic layer of Cr and atomic oxygen. There is a weakening of Si-Si bonds in the layers of silicon film close to monolayer Cr. Reactivity Cr atoms increases with their incomplete okyslennosti.
Keywords: catalytic effect of Cr, oxidation process, silicon film, the electron density functional, pseudopotential from first principles, density of valence electrons, electron energy spectra.

S.G. Orlovska, M.S. Shkoropado, F.F. Karimova

Investigation of Tungsten and Molybdenum Filaments Oxidation in Air

Odessa National I.I. Mechnikov’s University Odessa, Ukraine, Dvoryanskaya str. 2, 65082, (048) 723-62-27, svetor@rambler.ru

Investigation results are presented of high temperature oxidation of tungsten and molybdenum filaments, heated electrically in air at normal pressure. Temperatures histories of the samples are defined experimentally for non-stationary processes. Activation energies of oxidation reactions are defined for different temperature ranges. Stationary modes of high temperature heat and mass transfer are modeled. A heat loss to cold contacts is expressed analytically with account of molecular and convective heat transfer and resistive heating. The computer simulations results are in good agreement with the experimental data.
Keywords: high temperature heat and mass transfer, tungsten, molybdenum.

V.F. Zinchenko¹, V.P. Antonovich¹, V.E. Chygrynov²

Peculiarities of IR Spectroscopy of CeO₂, GeO - Based Nano-composites

1A. V. Bogatsky Physico-Chemical Institute of NAS of Ukraine, 86 Lustdorfska Doroga Str., 65080, Оdesа, Ukraine, e-mail:vfzinchenko@ukr.net
2Central Design Office "Аrsenal", 8, Moscovska Street, 02010, Kyiv, Ukraine, e-mail:dswon@mail.ru

Effect of nano-scale factor on the character of IR transmittance spectra of the nano-composites of CeO2 and GeO in the CsI matrix are studied in the interval of 4000 - 200 cm-1. The bathochromic shift and broadening of absorption Ce - O and Ge - O bands as well as periodic modulation of the spectral curves in the certain intervals of a spectrum for nano-structured specimens is revealed. The last is interpreted basing on the interference of nano-structures.
Keywords: IR spectroscopy, nano-composite, Cerium and Germanium oxides, absorption bands, modulation of a spectrum.

I.B. Olenych, L.S. Monastyrskii, O.I. Aksimentyeva, B.S. Sokolovskii

Adsorption Doping of Porous Silicon Nanostructures

Ivan Franko Lviv National University, 50 Dragomanov str., 79005, Lviv; e-mail:iolenych@gmail.com

It is presented the results of studies of current-voltage characteristics and spectral dependences of photovoltage in the 450÷1100 nm wavelength range of porous silicon layers on monocrystalline substrates of n-type conductivity under adsorption of bromine and iodine molecules. Adsorption of acceptor molecules is shown to lead to change in the nature of current-voltage characteristics of the samples from symmetric form to rectifying one. The obtained results are explained in the frame of qualitative model that involves formation in the adsorptinally doped structures of p-n junctions as a result of type conductivity inversion in porous silicon nanocrystals.
Keywords: porous silicon, adsorption doping, p-n-junction, photovoltage, spectral characteristics.

V.О. Kotsyubynsky¹, I.F. Muronyuk¹, V.V. Moklyak², V.L. Chelyadyn¹, V.M. Gun'ko³, P.I. Kolkovsky¹

Nanodispersed Titania Doped by Transitions Metals Oxides: Synthesis and Properties

¹Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine, v_kotsuybynsky@mail.ru
²A general research laboratory of physics of magnetic tapes of G.V. Kurdyumov Institute for Metal Physics, N.A.S. Ukraine and of
Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine, mvvmcv@mail.ru
³Chuiko Institute of Surface Chemistry NASU, vlad_gunko@ukr.net

The aim of this work was development of methods of synthesis of nanodisperse titania and combined systems with titania / transitions metal oxides. The influence of sodium sulphate solution on the phase composition of nanodisperse titania and combined systems TiO2 / х V2O5 (х=0,5; 1; 2; 3 wt%); TiO2 / х Сr2O3 (х = 1; 2; 3 wt%) and TiO2 / х MnO2 (х=3 wt%) was elucidated on the liquid-phase synthesis of the materials. An inhibition role of related to blocking of nanocrystalline anatase-rutile phase transformation was determined. Complex studies of obtained materials physical properties were carried out.
Keywords: titania, combined nanomaterials, anatase-rutile phase transformation.

О.А. Kapush, L.І. Trishchuk, V.М. Tomashik, Z.F. Tomashik, S.D. Boruk¹

Effect of Stabilizers and рН Dependence on Regularities of CdTe Nanocrystals Formation in Colloidal Solutions

Institute for Physics of Semiconductors National Academy of science of Ukraine, 41 Nauki Prospect, Kyiv 03028, Ukraine, savchuk-olja@rambler.ru
¹Yuriy Fedkovych Chernivtsi National University, 25 Lesi Ukrainki Str., Chernivtsi 58000, Ukraine

The physicochemical properties of nanosized systems based on CdTe, obtaining by colloidal synthesis, have been investigated. Influence of oxyethylenediphosphonic acid, ethylene diamine tetraacetate, thioglycolic acid, thiourea and L-cysteine on the processes of formation CdTe NCs in aqueous solutions has been determined also. It was shown that pH significantly influences the colloidal synthesis of CdTe NCs. On the other hand, the photoluminescence characteristics of these systems were studied in detail.
Keywords: cadmium telluride, nanocrystal, рН dependence, stabilizer, photoluminescence spectrum.

M.M. Solovan¹, V.V. Brus², P.D. Maryanchuk¹, A.M. Kafanov¹

Fabrication and Electrical Properties of n-TiO2:Fe/p-CdTe Anisotype Heterojunction Diode

¹Yuriy Fedkovych Chernivtsi National University, 2 Kotsybynsky str., 58012, Chernivtsi, Ukraine, e-mail:solovan-86@mail.ru
²Frantsevich Institute for Problems of Materials Science NAS of Ukraine, Chernivtsi Branch, Iryna Vilde str. 5, 58001, Chernivtsi, Ukraine, e-mail:victorbrus@mail.ru

n-TiO2/p-CdTe heterojunctions were prepared using the electron-beam evaporation technique. The current-voltage (I-V) characteristics of the heterojunctions were measured at different temperatures. The temperature dependences of the height of the potential barrier and series resistance were investigated. The dominating current transport mechanisms through the heterojunctions n-TiO2/p-CdTe were established at forward and reverse biases.
Keywords: heterojunction, series resistance, ТіО2, CdTe.

L.T. Strutynska, V.R. Bilynskyj-Slotylo, V.Ya. Mikhailovsky

Designing of Segmented Modules Based on PbTe/TAGS for Thermoelectric Generators

Institute of Thermoelectricity, 58029, Nauky St. 1, Chernivtsi, Ukraine, e-mail:slotulo@mail.ru

The results of the segmented generator modules designing and modules of functionally graded materials based on PbTe/TAGS for waste heat recovery industry, transport and also for the conversion of heat combustion of organic fuels into electrical energy are presented. The optimum sections materials and optimal functions of inhomogeneities functionally graded materials under which ensures the maximum efficiency of the thermoelectric generator modules were determined by computer methods based on optimal control theory. The comparative characteristics of these modules for use with heat sources, the temperature of which are 500 – 600 °C are given.
Keywords: segmented generator modules, heat recovery, energy converters.

V.Ya. Loburak

Increase Wear Resistance of Composite Electrolytic Coatings by Chemical And Thermal Treatment

Precarpathian National University, Shevchenko, 57 St., Ivano-Frankivsk, 76025, Ukraine

Conducted research influence of chrome dif-fusion of composite electrolytic coatings on their wear resistance.

L.T. Strutinska, V.V. Zhikharevich

Computer Simulation of Conditions of Crystallization Plane front Formation in the Process of Growth of Thermoelectrical Material

Institute of Thermoelectricity, 58029, Nauky St. 1, Chernivtsi, Ukraine е-mail:strutinskal@mail.ru

The analysis is given in the article of the influence of thermoelectrical materials growth conditions on the formation of plane front of crystallization. The results are stated of the computer simulation of growth process with the use of asynchronous cellular automaton. Based on the created models of thermophysical processes in liquid and solid phases, optimal kinetic, thermal and quantitative conditions of homogeneous Bi2Te3 based thermoelectrical materials growth are determined.
Keywords: computer simulation, plane front, cellular-automata algorithms.

V.V. Brus¹, Z.D. Kovalyk¹, P.D. Maryanchuk²

Electrical and Photoelectrical Properties of a Semiconductor Heterostructure N-Tio2/P-Gase

¹Chernivtsi department, Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, 58001 Chernivtsi, Ukraine, e-mail:victorbrus@mail.ru
²Electronics and energy engineering department, Yuriy Fedkovych Chernivtsi National University, 58012 Chernivtsi, Ukraine

Electrical and photoelectrical properties of a semiconductor heterostructure n-ТіО2/p-GaSe prepared by DC reactive magnetron sputtering of a titanium dioxide thin film onto a freshly cleaved GaSe single crystal substrate were investigated. The dominant current transport mechanisms through the heterojunction under investigation at forward and reverse biases were established.
Keywords: ТіО2, GaSe, thin film, heterostructure.

I.M. Gasyuk, M.Ja. Sichka, S.V. Vojtkiv, L.S. Kaykan

The Method of Allocation from Impedance Spectra Cathode Component of Electrochemical Power Sources

1Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine tel. 80-487-662398, Fax: 80-487-659602, E-mail:mishasichka@rambler.ru

Proposed method of allocation from impedance spectra cathode component of electrochemical power sources. Analysed impedance spectra obtained by this method. Shown that the main effect on the midrange semicircle classical electrochemical wavefield making processes that occur on the boundary electrode / electrolyte and in passivating film on the electrode boundaries.
Keywords: impedance, cathode, intercalation.

І.N. Kurmakova^1, О.І. Syza², A.A. Коrolev², L.М. Каpitanchuk³

Nanostructural Processes at Corrosion Inhibition of a Steel by Nitrogen-Containing Condensed Heterocycles

¹Chernigov National Pedagogical University, 14013, Chernigov, 53, Getmana Polubotka str., е-mail: kurmakova@mail.ru
² Chernigov State Tehnological University, 14027, Chernigov, 95, Shevchenko str., е-mail: syza@rambler.ru
³E.O. Paton Electric Welding Institute of the NAS of Ukraine, 03150, Kyiv, 11, Bozhenko str., tel/fax (044) 287-23-66

Experimentally proved by the Auger Electron Spectroscopy that high protective action (> 90 %) substances with tetramethyleneimidazoline, imidazoleazephine and triazoloazephine cycles in acid chloride medium condition on formation of nanostructural film (to 20 nanometers) on a surface of carbon steel.

H.O. Sirenko, L.M. Soltys, M.I. Martynyuk

Technology of Obtaining and Properties of Lubricant Additives based on Copper Complex Adduct of Monoglycidyl Ethers and Polyamines

Vasyl Stefanyk’ Precarpathian National University, 57, Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine Tel. (0342) 77.64.15; (096) 813.93.53, e-mail:orijant@gmail.com

Technology of obtaining and antifriction properties of lubricant additives based on copper complex adduct of monoglycidyl ethers and polyamines has been researched. It is shown that load binding with loadings depends on the concentration and order input source components of copper complex adduct of monoglycidyl ethers oxydiarylmethanes with polyamines, and also on isomerization of monoglycidyl ether, copper salt and polyamine.
Keywords: monoglycidyl ethers, load binding, lubricant additives, polyamines, antifriction properties, adduct.

S.P. Novosyadlyy, L.V. Melnyk

High-Efficiency Photovoltaic Solar Energy Converters Based Schottky Barrier to Amorphous Hydrogenated
Silicon ( a-Si:H)

Dep. Radiophysics and Electronics at PreCarpathian Vasyl Stefanyk National University 57, Shevchenko Str., Ivano-Frankivsk, 76018, Ukraine, e-mail:kre@pu.if.ua.

Amorphous hydrogenated silicon (a-Si:H ) - a relatively new semiconductor material that is promising to create a fairly cheap thin film photovoltaic solar energy. The first SE on the basis of this material is the structure of the Schottky barrier (BS). This allowed for a relatively short period of time (decades) for these structures get efficiency at 8-10% for CE small area. However, further development evolved solar cells based on pn junction (p & n-structure), which are used to create highly efficient SE large area with stable parameters and characteristics.

O.L. Voronych¹, S.A. Kurta¹, I.Ya. Sulym²

Physical and Chemical Properties of Cellulose Fibres Obtained From Wallpaper Wastes

¹Vasyl Stefanyk’ Precarpathian National University, 57 Shevchenko str., Ivano-Frankivsk, 76025, Ukraine, luka_le@mail.ru,
²Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine General Naumov street 17, 03164, Kyiv-164, sulim1981@mail.ru

Physical and chemical properties of cellulose fibers obtained from recycling wallpapers with PVC cover by removing the polymer coating from the paper were described. Reusing processes of those cellulose fibers was given. Industrial tests of fluff pulp obtained from waste wallpaper were conducted for the manufacture of asbestos cement slate and their impacts on the physical and mechanical characteristics of slate were shown. Methods of differential thermal analyze, infrared spectral and chemical analyzes, and examined using a microscope, cellulose fibers obtained from recycling wallpaper, comparative analysis of their properties with natural cellulose and PVA fibers, which are used in the manufacture of asbestos slate were held.
Keywords: wallpaper, recycling, waste, shredding, separation, cellulose fiber, PVC, asbestos, properties.

N.D. Freik^1,2, Yo.V. Tsymbrykevych²

Entropy in Their Science Views

¹Kyiv National Taras Shevchenko University, Str. Volodymyrivska, 60, Kiev 01601, Ukraine
²Vasyl Stefanyk’ Precarpathian National University, 57, Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine

Study man as a natural body, as a natural creature, because man is composed of the same elementary particles, atoms and molecules as well as any natural thing. The attention to the fact that man is totally dependent on the nature of air, water, soil, all animate and inanimate nature: sun, moon, solar system, our galaxy, their movements, rhythms, flashes etc. Keywords: man, nature, nature man.