PCSS, Т.9, №1, 2008

Abstracts

B.K. Ostafiychuk, I.F. Muronyuk, V.O. Kotsyubynsky, V.D. Glukhanyuk, V.L. Chelyadyn, N.N. Nagirna

Dye-Sensitized Solar Cells (Review)

Precarpathion University named after V.Stefanyk, 57 Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine

A short overview of the basic working principles and materials for dye-sensitized TiO₂ solar cells is presented. Photoelectochemical systems on the base of nanocrystal wide bandgap oxide semiconductors sensitized by different types of dyes have the great potential to become an economically and commercially avaible for conversion and using of solar energy. Advantages of the photoelectochemical cells over conventional solar cells are following: 1) they don’t need ultra-pure substances; 2) they consist of low-cost materials and they are produced by processes that have little environmental impact; 3) they achieve reasonable efficiencies which are expected to improve by systematic research. There is a flexibility in the choice of material for each component, allowing the properties to be adjusted and optimised for practical applications.

B.K. Ostafiychuk, I.M.Budzulyak, I.P.Yaremiy, L.S. Yablon

Structural Transformations in LaGa-Substituted Ferrite-Garnet Films, Conditioned by Action of Laser Irradiation

Precarpathion National University named after V. Stefanyk, 57, Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine

The research results of surface layers structure of La, Ga-substituted ferrite-garnet films implanted by the fluorine ions (energy of 90 keV, dose of 2•10¹³, 6•10¹³ and 1•10¹⁴ ion/сm²) and irradiated by laser both from implanted and from non-implanted sides are presented in the work. The profiles of relative change of interplanar spacing are calculated at these irradiation doses and different geometry of irradiation. The dominant mechanisms of laser irradiation influencing on the behavior of radiation defects are determined. Dependences of crystalline structure of implanted FGF on geometry of laser irradiation are set.

B.K. Ostafiychuk, I. M. Gasyuk, B. Y. Deputat, I.P. Yaremiy, L.S. Kaykan, T.V. Grabko

X-ray Powder Diffraction Studies of Aluminium-Substituted Spinel Lithium Ferrite

Physical-Technical Department at the Vasyl Stefanyk PreCarpathian National University, 57, Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine, E-mail:bdeputat@rambler.ru

Structural characteristics and phase composition of aluminium-substituted Li_0.5Fe_2.5O₄ spinel lithium ferrite synthesized by ceramic technology are explored. The cooling method influence on structural properties, cationic distributing and phase composition of the spinel material is shown. The phase transitions of «order-disorder» type, existence of spinel satiation areas, decreasing of unit cell parameters with increasing of the substitution degree are fixed.

B.K. Ostafiychuk, I.F. Muronyuk, O.D. Magometa, L.S. Yablon, I.І. Budzulyak, B.I. Rachiy

The Investigation of Thermal and Chemical Transformations of Nanoporous Carbon Material During Synthesis and Modification

Precarpathion national University named after V.Stefanyk, 57 Shevchenko St., Ivano-Frankivsk, 76000, Ukraine

There was investigated chemical reactions and physical transformations by methods of differential-termal (DTA) and thermo-gravimetric analysis (TG), flowing under influence of heat in carbonated (coal of apricot, plum, coco, cherry kernels, flaxseed wastes and pfenol formaldehyde resins) materials. In particular, with the help of TG one can see thermal change of investigated specimens mass. There was shown that for non- carbonated materials the loss of mass in the result of their heating in temperature interval 20-900 0C with the speed of 10 ⁰C per minute amounts to 85-90%, while for carbonated – 40-45% from total weight. Absorption of heat in temperature interval of 70-180 ⁰C is connected with separation of foxed water forms, and extraction of heat in temperature interval of 170-770 ⁰C – with burning out of carbon material.

I.F. Myronyuk, V.L. Chelyadyn, R.V. Ilnytsky, V.О. Kotsyubynsky, U.Ya. Dgura

The Synthesis, Structure and Electrochemical Properties of X-ray-Amorphous H₂TiO₃

Precarpathion National University named after V. Stefanyk, 57, Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine e-mail:myrif@rambler.ru , phone: +(0342) 59-60-29

The structure and morphology of nanosized particles of X-ray-amorphous H₂TiO₃ synthesized as a result of parted processes - hydrochloric-acid hydrolysis of TiCl₄ and polycondensation of obtained hydroxide chloride titanium Tі(ОН)₃Cl initiated NaOH are investigated using modern methods of diagnostics, namely infrared spectroscopy, spectroscopy of light dispersion, X-ray photoelectron spectroscopy, TG-DTA analysis, X-ray diffraction and electronic microscopy. We found out that in co-ordinating octahedrons [TiO₆] and tetrahedrons [TiO₄] form the basis of atomic structure of experimental samples H-titanate obtained under different technological terms conditions. H-titanate that has the layer-like structure demonstrates the biggest absorbtion capacity at the electrochemical intercalation of Lithium atoms in material-«host».
Key words: X-ray-amorphous Н-titanate, titania, anatase, rutile, infrared spectroscopy, coordinated oxygen surroundings of titanium, electrovalence of titanium, X-ray electronic spectroscopy, electrochemical intercalation.

I.M.Budzulyak

Transform of Structure in Double Semiconductors in Field Action Laser Irradiation

Precarpathion National University named after V. Stefanyk, 57, Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine

In this article impulse laser radiation influence onstructure perfection of linary semiconductors (PbTe, CdSb, CdTe) was investigated. There was shown, that the structure transformations jump at the appropriate values of pulse energy density, and the number of different transformations depends on the properties of semiconductor. In partial, bitter dislocation density increase be 50-100 times appears at the radiation energy density of 3 J/sm², regular grid at 7 J/sm² will be formed, thin material layer separation – at 9 J/sm². Layers of that kind can appear in CdSb monocrystals at the energy dencity of 11 J/sm², CdTe hasn’t this effect. Intensive dislocation movement in CdTe and PbTe monocrystals was discovered, it caused by laser radiation. Dislocations in CdTe are moving to the insertions and macro crack , in that case near the crack dislocation density is minima.

O. Kopayev

Magnetic Ordering in the Structure of Nickel Ferrites

Vasil Stefanyk Prekarpathian University, Ivano-Frankivsk, Ukraine

The analysis of factors which influence on the value of the effective magnetic field on the nuclei of iron in ferrite is conducted. The statistical model of the effective field in octahedral interstitial site is developed. Possibility to correct distributing of cations at calculations and evaluates the degree of magnetic order in ferrite appeared.

B.K. Ostafiychuk, M.V. Berceshuk, I.І. Budzulyak, O.D. Magometa

Laser Irradiation Influence on the Electrochemical Properties of Mn-Doped Activated Carbon Material

Precarpathion national University named after V.Stefanyk, 57 Shevchenko St., Ivano-Frankivsk, 76025, Ukraine

The influence of laser irradiation on electrochemical parameters of activated carbon materials (ACM) doped by manganese is investigated. It is shown, that laser irradiation of ACM by impulses of YAG-laser with frequency of f = 56-60 Hz and impulse energy range of 0,01-0,02 J/cm² results in improvement of characteristics of proper electrochemical capacitors. Thus, the using of ACM doped by 0,5 weight % Mn content is optimal.
Key words: electrochemical capacitors, activated carbon material, laser irradiation.

V.I. Mandzyuk, I.F. Myronyuk, B.K. Ostafiychuk, U.Ya. Dzhura

The Influence of Laser Irradiation on Thermodynamics Properties of Electrochemical Li / SiO₂ – С System

Vasyl Stefanyk Precarpathion National University, Shevchenko St.,57, Ivano-Frankivsk, 76025, Ukraine

The influence of laser irradiation on thermodynamics of lithium ions electrochemical intercalation process into nanocomposite C – silica is investigated. It is shown, that the optimal irradiation time is 2 min at the chosen identical parameters of irradiation (energy in an impulse, impulse duration, time of the impulse following) in relation to the improvement of specific energy parameters of the system. The principal reason of decrease of intercalation degree is the reduction of specific surface of the explored materials conditioned by laser irradiation action.

B.K. Ostafiychuk, B.I. Rachiy, I.І. Budzulyak, O.D. Magometa

Obtaining and Electrical Properties of Coconut Shell Based Nanoporous Carbon Material

Precarpathion national University named after V.Stefanyk, 57 Shevchenko St., Ivano-Frankivsk, 76025, Ukraine

Electrical properties of ctivated carbon materials (ACM) based on the different kinds of natural raw materials were investigated. Thermal afteractivation of ACM in the air stream lead to increasing of supercapacitors specific power properties.
Key words: supercapacitors, activated carbon material.

V.A. Romaka ^1,2, Yu.V. Stadnyk³, D. Fruchart ⁴, J. Tobola⁵

Peculiarity in Band Structure and Conductivity Mechanisms in Heavily-Doped TiCo_1-xCu_xSb Solid Solution

¹Ya. Pidstryhach Institute of Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine, 79060 Lviv, Ukraine; ²National University “Lvivska Politechnika”, 79013 Lviv, Ukraine;
³Ivan Franko Lviv National University, 79005 Lviv, Ukraine;
⁴Laboratoire de Cristallographie, CNRS, 38042 Grenoble, France;
⁵AGH University of Science and Technology, 30-059 Krakow, Poland;

Calculation of the band structure and distribution of electronic density (DOS) of the TiCoSb intermetallic semiconductor were performed at it doping with donor impurities by way of substituting Co atoms by Cu ones. Temperature and concentration dependences of electro-conductivity, thermopower of p-TiCoSb semiconductor were investigated at various concentrations of donor impurities in the 80 - 380 K temperature range. An insulator-metal transition of the conduction forecasted by the model calculation in the ZrNi_1-xCu_xSn solid solution alloys (Anderson transition) is caused by the displacement of the Fermi level from the impurity donor band to the conduction band as the donor impurity concentration increases.
Key words: semiconductor, donor impurity, Fermi level, electrical conduction.

L.V. Kostyk¹, Ya.M. Zakharko¹, O.V. Tsvetkova¹, A.P. Luchechko¹, M.R. Panasyuk²

Deep trap Levels in Gd₃Ga₅O₁₂ Crystals Doped with Chromium

¹Ivan Franko National University of Lviv, Faculty of Electronics 107, Tarnavskogo Str., Lviv, 79017, Ukraine
²Ivan Franko National University of Lviv, Scientific technical educational center of low temperature studie 50, Dragomanov Str., Lviv, 79005, Ukraine

The X-ray luminescence, photoluminescence, luminescence excitation spectra and thermostimulated luminescence (TSL) of Gd₃Ga₅O₁₂ (GGG) polycrystalline samples under X-rays irradiation have been investigated in the temperature region 295-600 K. TSL spectral composition was studied. The activation energy of traps, which corresponds to the TSL peaks, was estimated. It is concluded, that TSL peak at 384 K with activation energy ~0.96 eV, is caused by electron delocalization from Cr³⁺e traps. The nature of other TSL peaks is discussed.
Key words: X-ray luminescence, thermostimulated luminescence, gadolinium gallium garnet, activation energy.

P.D. Maryanchuk, E.V. Maistruk

Influence of Thermal Treatment on the Defect Subsystem of Hg_1-xMn_xТe_1-yS_y Crystals

Yu.Fedkovych Chernivtsi National University, M. Kocubynsky Street, 2, 58012 Chernivtsi, Ukraine (037)22-4-68-77, emaistruk@list.ru

In temperature interval of 77 - 300 K and in magnetic field range of H ≈ 0,5 - 6 kOe kinetic coefficients for Hg_1-xMn_xТe_1-yS_y (0 < x ≤ 0,14; у = 0,01) crystals have been researched before and after thermal treatment in components vapour. Mechanisms of transformations in defect subsystem of Hg_1-xMn_xТe_1-yS_y during annealing of crystals in components vapour have been established.

V.A. Zuev, L.M. Gorynya, G.A. Sukach

Surface Potential in CdP2

State University of Information & Communication Technologies & Solomyanska, Kyiv, 03110, Ukraine

It was investigation the condensor photo – e.m.f. under large injection levels. It was established the platoon when band bending on the surface and photo memory effect.

O.M. Bordun, V.V. Dmytruk

Photoluminescence of Bi³⁺ in Thin Films of Y₃A_l5O₁₂:Bi

Ivan Franko Lviv National University, 1, Universytetska Str., Lviv, 79000, Ukraine, tel. (0322) 964-679, e-mail:bordun@electronics.wups.lviv.ua

The excitation spectra and photoluminescence spectra in thin films Y₃Al₅O₁₂:Ві were investigated. The luminescence was stimulated by light from centers of two types which related with Bi³⁺ in octahedra and dodecahedra oxide surroundings. The light of Bi³⁺ in the position with point symmetry D2 leads to ultra-violet luminescence with the maximum at 3.75 eV, which corresponds to the transition ³P₁ – ¹S₀. The light of Bi³⁺ in the position with point symmetry C_3i leads to blue luminescence with the maximum at 3.15 eV, which is related to the transition ³P₁ – ¹S₀.
Key words: thin films, yttrium-aluminum garnet, activation by bismuth, spectrum of luminescence.

N.S. Zayats, V.G. Boiko, P.A. Gentsar, O.S. Lyvyn, N.V. Sopinskyy

Surface Morphology and Optical Properties of AlN/n-Si (100) Films

V.E.Lashkarev Institute of Semiconductor Physics, NASU, Kiev-28, prospect Nauky, 41, 03028, Ukraine, E-mail:gentsar@isp.kiev.ua

The AlN films of 0.5 - 1 micron thickness on substrates of monocrystal silicon n-Si(100) with specific resistance 500 Ohm .cm were obtained by the evaporation of an aluminium target in a gas mix Ar and N₂ (1:3.5) by means of high frequency magnetron sputtering method. It was studied the surface morphology and optical properties of AlN/n-Si (100) films (reflection spectra in the a range of 200-750 nm, ellipsometry, absorption spectra in a range of 2-25 microns). It was shown, that obtained films are optically homogeneous in a wide range of wavelengths (the ultra-violet, visible region and infra-red region) and can effectively be used in thin-film technology for manufacturing modern micro- and optoelectronic devices.

Ya. Zaulichniy, Yu. Solonin, S. Zvezda, E. Prilutskiy

Research of X-ray Features Electronic Structure of Multi-layer Carbon Nanotube from Dependence at Their Diameter and Imperfectness

Institute of problems of materialoznavstva the name I.M. Frantsevicha NAN of of Ukraine 3, Crgiganivscogo Str, Kiev, 03680, Ukraine, e-mail:zvezda@ipms.kiev.ua

The investigations of the electronic structure in multi-wall carbon nanotubes obtained by different methods with different diameters were performed by means of the ultra-soft X-ray emission spectroscopy. It has been revealed that the narrowing of the СKα-spectra of nanotubes was due to decreasing the degree of the πpz-overlapping above the nanotubes surface. It has been established that the narrowing of the emission bands induced by the great number of broken bonds, which appeared after purifying from catalysts, was significantly greater than that due to decreasing nanotubes diameters. It has been found that the overlapping of the πpz-orbitals became insensitive to changes of nanotubes diameters at thickness exceeded 70 nm.

G.V. Korencova¹, O.M. Scherbatiy², O.H. Tadeush¹, S.A. Nedilko^3, A.Y. Senkevich², V.M. Uvarov²

Electronic Structure of Oxides LnVO₄ (Ln = La, Sm, Gd)

¹Pivdennooucrainskiy state pedagogical university the named by K.D.Ushinscogo Staroportofrancivsca Sts, 26, 65091, Odessa, E-mail:allforme@eurocom.od.ua
²Physics of metal institute name by G.V.Courdyomova NAS of Ukraine, boulv. Acad. Vernadscogo, 36,.03680, Kiev,
³ Kiev National University named by T.Shevchenco of, Volodimirsca Str., 62а, 01033, Kiev,

Electronic structure of the LnVO₄ (Ln = La, Sm, Gd) ortovanadates is investigated using X-ray spectroscopy as well as the band-structure LAPW-calculations. The information about the charge and spins description of atoms, and also about law’s conformities of power zones forming of the valency states in an oxides LnVO₄ (Ln = La, Sm, Gd) has been receipt.
Key words: electronic structure, vanadate, X-ray spectras, LAPW- calculations.

A.P. Naumenko¹, N.I. Berezovska¹, M.M. Biliy¹, O.V. Shevchenko²

Vibrational Analysis and Raman Spectra of Tetragonal Zirconia

¹National Taras Shevchenko University of Kyiv, 2, Akademika Glushkova Prosp., Build. 1, Kyiv, 03680, Ukraine, E-mail:a_naumenko@univ.kiev.ua; n_berezovska@univ.kiev.ua
²Frantsevich Institute for Problems of Materials Science, National Academy of Science of Ukraine, 3, Krzhizhanovskogo str., Kyiv, 03142, Ukraine

The nanocrystalline powders and polycrystalline materials on the basis of stabilized zirconia with tetragonal type of structure have been investigated. The forms of the normal vibrations of the t- ZrO₂ have been built using the theory group methods. The peculiarities of experimentally obtained Raman spectra of studied materials have been explained with the help of analysis of symmetry and the forms of the fundamental vibrations.
Key words: zirconia, polymorphic modification, lattice dynamics, Raman spectra.

M.V. Chekaylo¹, V.O. Ukrainets², G.A. Il’chuk², Yu. Pavlovskyj³, R.Yu. Petrus’²,V.V. Kus’nezh², B.S. Vus ⁴

Differential Thermal Analysis of Se, Ag-Se, Sn-Se Mixture in the Process its Heating and Synthesis of Ag2Se, SnSe2, Ag8SnSe6 Compounds

¹Department of Organic Chemistry,
²Department of Physics,
³Department of Physical and Colloidal Chemistry,
⁴Department of Electronic Facilities of Informatively-Communications Technologies National University ‘Lvivs’ka Politekhnika’, 79013, Lviv, Ukraine

The processes of phase transitions (PT) which accompany Ag-Sn–Se mixture heating as well as heating of selenium mixture (Se) and mixture of binary ingredients Ag-Se, Sn-Se in stoichiometry ratio that correspond to compounds Ag₈SnSe₆, Ag₂Se and SnS₂ are for the first time studied by means of differential-thermal analysis (DTA) method. The basic types of phase transitions and chemical reactions of Ag₈SnSe₆, Ag₂Se and SnSe₂ compounds formation and enthalpies and melting points are determined. DTA confirms experimentally the formation of Ag₈SnSe₆ and Ag₂Se corresponds at cooling.

M.I. Terebinska, V.V. Lobanov

Dissociate Adsorption of Water Molecule on Unrelaxed (111) and (100) Faces of Crystalline Silicon

A.A. Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, Gen. Naumov street 17, 03164, Kyiv, Ukraine terebinska_m.i@bigmir.net

Calculations have been carried out of equilibrium structures by means of density functional theory method of clusters simulated for the complexes possibly formed due to direct contact of H₂O molecule with atomically clean (111) and (100) faces of crystalline silicon. Water molecule was shown to adsorb on silicon surface exceptionally in a dissociate way with liberation of a considerable energy.
Key words: cluster, (111) and (100) faces, dissociation, superficial atoms.

.E. Kostenko, M.I. Shtokalo, M.G. Hristiansen, S.M. Ivanova

The Complexing Zr (IV) with the Solid Phase Sulphonazo III Consider and Analytical Use This

Department of analytical chemistry of the National university of food technologies, 68, Volodymyrska Str, Kyiv, 01033, Ukraine, E-mail:kee@nuft.edu.ua

The sorption and complexing of Zr (IV) with the sulphonazo III in the solid phase has been considered. Quantitative characteristics of the compoundes stability has been obtained. The procedur for determining of Zr (IV) in the alloy has been discribe.

I.M. Mykytyn, S.A. Kurta, O.S. Kurta

The Characteristic and Activity of the Catalysts Oxidizing Chlorinating of the Ethylene Different Descent

Vasyl Stefanyk National Precarpathian University. Chair of chemistry, the B.Hmelnyckogo Str, 2, 77300 Kalush, Ukraine; 4-21-04, е-mail: kca@arte-fact.net , mib80@mail.ru.

The comparative investigation of the characteristics and quality different catalysts oxidizing chlorinating of the ethylene in 1,2-dihcloretan is conducted. The utilized catalysts on basis γ-Al₂O₃ and CuCl₂ of the different nature is produce leading business of world: Engelgard, Montedison, Ron-Pylenk, Jion, Montecatiny, BASF, COHDEA. The results of the activity and selectivity and manufacturability of the catalysts is obtained on empirical laboratory plant in the industrial current of the reaction gases(C₂H₄, HCl, O₂).

Y.K. Ivashina, O.V. Nemchenko

Hydrogen Segregation’s Influence on Amplitude Dependent Internal Friction in Ta-H System

Kherson State University 40 Let Oktyabrya, 27, Kherson, 73000

The amplitude dependent internal friction in solid solutions of hydrogen in tantalum in a range of concentration 0÷5,5 at. % Н is investigated. It is found out the complex dependence of internal friction from the hydrogen contents in a range of relative deformation amplitudes 10^-5 to 10^-4. Four components of the internal friction are selected. Two of them, the amplitude - independent background and the microplastic asymptote do not depend on concentration of hydrogen. Two other components are changed in opposite directions, with the growth of the hydrogen contents and forming the complex amplitude dependence of the whole system. Possible mechanisms of concentration dependent components of internal friction are offered on the basis of viscous braking dislocation by hydrogen atmosphere and dislocation latching by grains of hydride phase.

H.A. Sirenko, M.B. Kvych, L.Ya. Midak

The Structure and Phase Composition of Surface Layers of Carbon Fiber, Metallized with PbS

Vasyl Stefanyk’ Precarpathian National University,57, Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine

The changes of surface layers crystal structure of carbon fibers in the course of copper-plating were investigated. The metallic coating process using modified formaldehyde and zinc technology was realized. It is established, that copper content in copper-copper oxide increases when using two-layer alternately modified formaldehyde and zinc method. The changes of surface layers crystal structure of carbon fibers in the course of Cu0-PbS-plating were investigated.

L.I. Anatychuk, V.Ya. Mikhailovsky, O.V. Chaikovska

Semiconductor Thermoelectric Generator for Self-Contained Systems

Institute of Thermoelectricity of the National Academy of Sciences and Ministry of Education of Ukraine, 58002, Chernivtsi, P.O.Box 86, E-mail:anatych@inst.cv.ua

The results of research on thermoelectric generator for power supply to electronic and electromagnetic devices of automatic systems for gas heaters are presented. The generator physical model is proposed, the results of calculation and optimization of basic parameters of two variants of thermogenerators are given.
Key words: thermoelectric generator, physical model, self-contained system, heat exchanger.

V.P. Veleschuk¹, O.I. Vlasenko¹, O.V. Lyashenko², A. Baidullaeva¹, B.K. Dauletmuratov¹

Acoustic Emission and Changes of Luminescent and Electrical Characteristics of InGaN/GaN Heterostructures at the Current Loading

¹V. Lashkaryov Institute of semiconductor physics, NAS of Ukraine, 03028, Kyiv, prosp Nauky 41
²Taras Shevchenko Kyiv National University, 03680, Kyiv, prosp. Glushkova, 2/1 E-mail:vvvit@ukr.net

In the paper correlation of acoustic emission occurrence and changes of luminescent and electrical characteristics of InGaN/GaN heterostructures have been revealed at loading a forward direct current that indicates their common mechanism of an origin. It is shown, that the amount of acoustic emission sources in InGaN/GaN heterostructures at flowing of critical density of a direct current depends on temperature and considerably increases with growth of temperature.

V.M. Kichak, V.V. Stronsky

Comparative Analysis of Reliability Indexes Majorities Links on Logical Elements

National technical university, 95, Khmelnytske shosse Str, Vinnytsa, 21021, Ukraine

An integral microcircuit (IMC ) de bene esse is parted on component parts : logical element(LE), corps, crystal, circle of food. Component parts of refusals of IMC are parted on those, that result in the refusal of LE or IMC. At calculations by the physical method of intensities of refusals LE, circle of food to take into account the refusals of explorers and external conclusions is offered. Taking into account it the value of intensity of refusals of crystal of IMC, and also probability of faultless work of the second majority link is specified. The requirement is found to component parts of probabilities of faultless work which the comparative analysis of majorities links is conducted by. Tables are resulted with initial data and calculations of intensities of refusals and probabilities of faultless work of component parts of IMC and majorities links.

V.I. Tsotsko¹, I.M. Spiridonova², B.I. Peleshenko¹, A.I. Denisenko³

Distribution of One-dimensional Sample Temperature in Conditions of Local Thermal Treatment

¹Dnepropetrovsk State AgrarianUniversity, Voroshylova Str., Dnipropetrovsk, 49600, Ukraine, E-mail:dsaupelesh@mail.ru,
²Dnepropetrovsk National University, Naukovy Side Str., 13, Dnipropetrovsk, 49050, Ukraine
³National Metallurgical Academy of Ukraine, Gagarina Ave., 4, Dnipropetrovsk, 49600, Ukraine

A temperature field in the depth of metal samples has been examined in conditions of linear increasing and subsequent decreasing of the surface temperature of a one-dimensional model. The results of estimation have been applied for low-carbon steels. Distributions of temperatures in the samples on heating and cooling of the processed surface in a set temperature interval have been received analytically. There has been analyzed influence of speed of the surface cooling on the temperature field in the samples in a wide range. The dynamics of temperatures of the sample surface layers has been studied. The received results may be used in the processes of local treatment of parts in conditions of diffuser saturation of the surface layer as well as for estimation of thermocyclic treatment parameters.

О.М. Beregova, A.I. Costrgitskiy, T.V. Cheban

Oxides Thin Films on the Surface of Steel and Their Role in Forming of Adhesion Contact from Besieging of Condensation Coverages

Odessa national academy of food technologies department of physical and colloid chemistry, 112, Kanatna Str, Odessa, Ukraine, E-mail:kapitoskay@rambler.ru

The mechanism of forming of contact, that concernes by the temperature condition of condensation and technological parameters of process is explained. Theoretical calculations are conducted and their experimental verification rotined that in the case of the ordinary termovakuum sawing the previous warming up of steel in a vacuum in the atmosphere of remaining gases determines forming of tape of oxide, that answers a structure g-Fe₂O₃. The mechanism of forming of contact, that concernes by the temperature condition of condensation and technological parameters of process is explained. Theoretical calculations are conducted and their experimental verification rotined that in the case of the ordinary termovakuum sawing the previous warming up of steel in a vacuum in the atmosphere of remaining gases determines forming of tape of oxide, that answers a structure g-Fe₂O₃.
Keywords: corrosion, coverage, porosity, ionic besieging sawing.

A. Shalygin

The Model Evaluation of Protective Properties of Cathode Film-Coatings for Construction Materials

Odessa national academy of food technology, Kanatnaya st. 112, Odessa, 65039, Ukraine

The protective properties of some film-coating materials, has been researched. The local electrochemical parameters have been determined by probe. Currents of corrosion processes propagating in pores have been calculated. Weight losses of substrate materials were calculated. These meanings and gravimetric results were compared. The model laboratory tests of coating and substrate materials have been proposed.
Key words: protective vacuum-condensated film, researching of local corrosion processes, the researching methodology of protective properties of film-coatings.

P.S. Kosobutskyy¹, A. Morgulis², O.P. Kushnir³

Regularities of Manifestation of Pseudo Brewster Angular Condition in Ellipsometric Spectra of Single-Layered Structures

¹Lviv Polytechnic National University, Bandera Str. 12, Lviv, 79646, Ukraine
²City University of New York, 199, Chambers Str., New York 10007, USA
³Lviv State Agrarian University, V.Velikogo Str. 1 , Dubljany, Lviv region, 80381, Ukraine

In this paper the light wave reflected from single-layered structure has been study theoretically. It is shown, that the characteristic changes for polarization parameters and are caused by manifestation of the pseudo Brewster angular requirement.

M. Shiplyak¹, A. Kikineshi², D. Beke², K. Sangunni³

Amorphous Chalcogenide Nanomultilayers for Photonics

¹Institute of Solid State Pysics and Chemistry, University of Uzhgorod, Pidhirna Str.46, Uzhgorod, 88000, Ukraine, phone +38 031 22 32485, E-mail:sse@univ.uzhgorod.ua
²Institute of Physics, University of Debrecen, Bem ter 18/a, Debrecen, 4026, Hungary, phone +36 52 415222, E-mail:kiki@tigris.unideb.hu
³Depoartment of Physics, Indian Institute of Science, Bangalore, India, E-mail: sangu@physics.iisc.ernet.in

We have developed a number of nanolayered structures from amorphous chalcogenide materials, which consists of stacks 1-10 nm thick sub-layers (Se, Te, AsSe, SeTe, As₂S₃, SiO_x, Sb, Bi) with alternating compositions, deposited by cyclic vacuum thermal evaporation on special glass, sapphire, silicon substrata. Efficient interdiffusion and composition or phase change in an acceptable time domains can be stimulated in these structures by laser irradiation, ion beams, current pulses, while the initial structures are stable at normal environment conditions. The main result of these stimulated solid state processes is the well localized change of optical and electrical parameters (transmittance, refractive index, conductivity, permittivity) which in turn can be used for optical recording, surface pattern formation, memory devices.
Key words: nanostructures, multilayers, interdiffusion, optical characteristics.