PCSS, V.7, N1, 2006

Abstracts

Pawel Andruszkiewicz¹, Marta Piatek², Ryszard Ukielski²

Electrical Properties of Thermoplastic Elastomers Copoly (Amide-Block-Amide)s

¹ Electrical Department, Section of High Voltages and Electrotechnology 37, Sikorskiego Str., 70-313 Szczecin, Poland, E-mail:andrut@ps.pl
² Polymer Institute, Section of Elastomer Technology and Chemical Fibers 10, Pulaskiego Str., 70-322 Szczecin, Poland

The paper presents the results of tests aimed at checking suitability and applicability of materials in the group of multiblock thermoplastc elastomers for electrotechnical purposes. The modifications in chemical composition of the materials concerned allow to influence their mechanical and electric properties, and thus better material suitability for particular uses. Special structure of the polymers considered provides more advantageous improvements in properties than the addition of fillers to polymers. There were main electric parameters tested for the series of copoly(amide–block-amide)s - (PA12-b-PA6.36)-n , i.e. volume resistivity, dielectric loss coefficient, electric arc and comparative tracking index (CTI), as well as the changes in the above parameters due to one day water absorption. The results obtained show the influence of hard and soft copolymer blocks shares on electrical parameters. Keywords: multiblock thermoplastic elastomers, soft and hard blocks, electric properties.

V.І. Hryvul, М.V. Demych, V.P. Makhniy, М.М. Sljotov

Optical Properties of Stratums CdTe:Sn

‘Jury Fedkovich’ Chernovtsy National University

Optical properties of cadmium telluride crystals alloyed by an amphoteric impurity of tin from a vapour phase are explored. Absence of a photoluminescence of examinations objects in a range of energies 0,6-1,6 eV at the temperatures 77 - 300 K are speaks fluctuation of the impurity potential caused by effects of the strong doping and neutralization.

A.A. Druzhinin, I.P. Ostrovskii, N.S. Liakh-Kaguj, Yu.R. Kogut

Conductance Behaviour of Si-Ge Whiskers in the Fields of Effective External Influence

National university “Lvivska polytechnika”, Sci.-Research Center “Crystal”, Kotlyarevsky street 1, Lviv, Ukraine, 79013, Phone: 38 0322 721632, E-mail:druzh@polynet.lviv.ua

Influence of strain and magnetic fields on conductance behaviour in Si_1-xGe_x (x = 0,01-0,05) solid solution whiskers with boron concentration (1-4) 10¹⁸ сm^-3 at low temperatures 4,2-50 К were investigated. Negative magnitoresistance and maximum of gauge factor were observed in the whiskers at temperatures Т = 15-18 К. These effects were explained by peculiarities of hopping conductance on delocalized states of upper Habbard band.

V.A. Zuev¹, L.M. Gorynya¹, G.A. Sukach¹, Yu.V. Kryuchenko², D.V. Korbutyak²., V.G. Litovchenko²

The influence of the surface on the exiton reflectance of b-ZnP₂ crystals

1 State University of Information-Communication Processing Techniques 2 Institute of Semiconductor Physics NAS of Ukraine, prospect Nauki 45, Kyiv, 03028

An influence of ingomogeneous subsurface region in spatially dispersive semiconductor crystals on excitonic reflection of the light is considered. A general calculation method is developed for this purpose. It is based on numerical integration of a differential equation system describing the polariton propagation through the ingomogeneous region. A special case of surface band bending caused by Schottky barrier is considered in detail. Theoretical results are used to explain the peculiarities arising in excitonic reflection spectra of b - ZnP₂ crystals. Experimental investigation of exiton reflectance spectra of b - ZnP₂ crystals has been carried out under different surface conditions.

Aleksandra Zurawska

Photoacoustic detection of phase transitions

Technical University of Opole, Physical Laboratory, 75, Ozimska Str., 45-370 Opole, Poland, e-mail:zurola@po.opole.pl

The usability of the photoacoustic effect in studies of the phase transitions in the surface layers of various materials has been proved using an apparatus for continuous, automatic registration of the temperature dependences of the parameters (amplitude and phase) of the photoacoustic signal, built in our laboratory. The results obtained seem to be very promising to applied for studying the ageing processes in dielectrics, especially in polymers used for construction of insulating systems.

P.P. Kostrobii, M.V. Tokarchuk, V.I. Alekseyev

Time evolution modelling of the surface cover for catalytic synthesis of carbonic acid gas

Carbon acid gas synthesis in carbon mono-oxide oxidation reaction is considered. Differential equations system for modelling the process is offered and results of solution of reduced system with diffusion neglected and constant reaction coefficients are presented. Temperature was taken equal T=520 C, partial pressures of incoming components were and for carbon mono-oxide and oxygen respectively. Peculiarity of the presented model is an attempt to take into consideration surface close interactions through surface close concentrations of CO and O₂. Results were, as it would be expected: best incoming concentration CO and O₂ is 2:1. Reaction product occupies space in surface close area instead of CO. Reaction time is about 2 seconds for best initial conditions. We also suggest using dependence curve between adsorbed CO and O coverage as qualitative index of best initial conditions. Best conditions achieved when the curve becomes a loop.

Full text (on original language) .pdf (358kb)

M.M. Malyovanyk¹, M.M. Shyplyak¹, A. Chik², K. Sanguni³, V. Tokach⁴

Photo- and thermoinduced diffusion in chalcogenide nanolayered structures in Se_xTe_1-x/As₂S₃

¹Department of Solid State Physics&Chemistry , Uzhgorod National University , Uzhgorod, Ukraine
² Debrecen University, Debrecen, Hungary
³ Indian Institute of Science, Bangalore, India
⁴ Institute of Electron Physics National Academy of Sciences, Uzhgorod, Ukraine

Influence of light and temperature on the change of optical parameters of Se_xTe_1-x/As₂S₃ multilayered structures (MS) are investigated. The role of thermo- and photodiffusions componens in the prosesses of amplitude optical recording is discussed. Optimization of recording parameters is possible due to the change of sublayres thikness of MS on the wave length of recording laser. Photoexpansion in MS due to the diffusion processes may be used for creation of surfaces reliefs by holografic recording in real scale of time.

N.L. Dmitruk, О.S. Kondratenko, S.A. Kovalenko, І.B. Маmontova

Classical and Topological Dimensional Effects in Optical Properties Gold Thin Films

Institute of Semiconductor Physics NAS of Ukraine, prospect Nauki 45, Kyiv, 03028, E-mail:dmitruk@isp.kiev.ua

Using both the spectral data of reflectance / transmittance and the ellipsometric monochromatic data of thin (5-50 nm) gold films, the size dependence of optical parameters (n, k, or Re e, Im e) have been determined. The real classic size effect and the apparent size effect were discovered in continuous and island films, respectively. The possibility of discovery of the size dependence of the plasma frequency and the scattering frequency of electrons is discussed too.

D.M. Freik, B.S. Dzundza, Y.P. Saliy

The Annealing Processes Modeling in Lead Telluride Polycrystal Films

Department of physics and solid chemistry Precarpathian national university of name of Vasiliy Stefanyk 201, Galitska Str., Ivano-Frankivsk, 76000, Ukraine, E-mail:freik@pu.if.ua

The approximation of specific resistance (ρ) change of time (t) of their self-controls in vacuum at 300 Кof PbTe polycrystall films by mathematical dependences. The electrical-technics model for resistance calculation of PbTe films of different thickness ((0,05 – 10) мкм) is offered. It is shown, that the ρ(t) change is related with reconstruction of films crystal structure. The dependence of linear sizes of PbTe films crystalline us time of their annealing is determine.

G. Krylova, А. Eremenko, N. Smirnova

Photochemical Generation of Nanosized Silver Particles in Mesoporous SiO2 Films

Institute of Surface Chemistry, National Academy of Sciences, General Naumov str., 17, Kyiv, Ukraine 03164, e-mail:annaerem@voliacable.com

Мesoporous silica films were synthesised by sol-gel method in the presence of triblock copolymer Pluronic P123 as a template agent. Films modified with silver ions were obtained by the addition of AgNO₃ salt to the liquid precursor. Irradiation of these films with 365 nm light, in the isopropyl alcohol solution of organic photosensitizer benzophenone (BP) leads to the formation of silver nanoparticles introduced into the porous silica matrix. For studies of the films structure the transmission electron microscopy (TEM) and X-rays diffraction and optical spectroscopy measurements were applied. Excitation and luminescence spectra of BP in adsorbed state and transient absorption spectra of photolysis products in isopropyl alcohol solution were investigated for photoreduction mechanism definition.

Z. Stasyuk, E. Koval’chuk, M. Kozak, A. Kravchenko

Gas Desorption During Destruction of the Polyaniline Samples with Electron Bombardment

Ivan Franko Lviv National University, 50, Dragomanova Str., Lviv, 79005, Ukraine

The gas desorption during destruction of the polyaniline samples with electron beam of energy in range 50-200 eV as a function of both electron current density and interplay time has been investigated under high vacuum conditions. Polyaniline gas desorption caused by polimer destruction and bulk desorption after vacuum preparation. The composition of gas desorption product and outgassing rate were calculated.

T.I. Gorbanyuk¹, A.A. Evtukh¹, V.G. Litovchenko¹, V.S. Solnsev¹, E.M. Pakhlov²

Adsorption of Hydrogen Containing Molecules in the Multi-layers Structures Based on the Porous Silicon and Palladium Films

¹ Institute of Semiconductor Physics, National Academy of Science of Ukraine, 41 prospect Nauki, 03028, Kiev, Ukraine.
² Institute of Surface Chemistry, National Academy of Science of Ukraine, Generala Naumov str. 17, 03127, Kiev, Ukraine

The adsorption properties of MIS (metal-isolator-semiconductor) structures based on the mesoporous silicon layers (Simeso) with the thin Pd films have been investigated. The main parameters of Simeso layer have been obtained and then influence on adsorption ability of the MIS – structures have been studied. The adsorption sensitivity of these structures was investigated under the action of the hydrogen containing molecules. It was also found that the Pd-MIS-structures with the partially oxidized mesoporous silicon possess of anhanced adsorption sensitivity to H₂, H₂O, C₂H₅OH action. The anomalous characters of the adsorption isotherms have been explained in the frame of the proposed physical model.

N.I. Klyui¹, A.N. Lukyanov¹, V.D. Osovskiy², V.P. Temchenko¹, O.V. Gomenyuk¹, R.M. Motrenko¹

Peculiarities of Technology for Plasma- and Photo-stimulated Deposition of Thin Diamond-like Carbon Films

1V. Lashkarev Institute of Semiconductor Physics National Academy of Sciences of Ukraine, 41 Nauki avenue, Kiev, Ukraine, 03028, E mail: klyui@isp.kiev.ua
2 Institute of physics National Academy of Sciences of Ukraine, Nauki avenue 46, Kiev, Ukraine, 03028

Systematic analysis of construction types of module setup for plasma-photostimulated deposition of films has been performed. An original construction of capacitive plasma reactor was proposed. On the base of proposed design and scientific approaches an experimental sample of the setup was produced. The arrangement and test of the setup were performed. An experimental batch of diamond-like carbon films was obtained. The effect of the deposition regimes on the films properties was studied to optimize the deposition regimes for the films formation.

A.A. Goncharov^1,2, P.I. Ignatenko¹, V.V. Petuhov², V.A. Konovalov², D.N. Terpij²

Formation of Phases and Structure Films of Borides the Transitive Metals

¹ Donetskiy national university, Donetsk, Ukraine
² Donbass state machine-building academy, Kramatorsk, Ukraine

Processes formation of phases films of borides the transitive metals of the fifth group – vanadium and a tantalum are featured.

O.I. Bodak¹ , V.A. Romaka^2,3, Yu.K. Gorelenko¹, M.G. Shelyapina⁴,Yu.V. Stadnyk¹, L.P. Romaka¹, V.F. Chekurin², D. Fruchart⁵, A.M. Gorin¹

Some Conditions for Maximum Power Factor Arising in Intermetallic Semiconductors With Structure of the MgAgAs-Type

¹Ivan Franko Lviv National University, Kyryl аnd Mephodiy Str. 6, 79005 Lviv, Ukraine;
²Ya. Pidstryhach Institute of Applied Problems of Mechanics and Mathematics National Academy of Scieces of Ukraine, 3-b Naukova Str., 79060 Lviv, Ukraine;
³National University “Lvivska Politechnika”, Bandera Str. 12, 79013 Lviv, Ukraine,
⁴V.А. Fock Institute of Physics, St. Petersburg State University, Ulyanovskaya 1, Petrodvorets, 198504, St.-Petersburg, Russia;
⁵Laboratoire de Cristallographie, CNRS, BP 166, 38042 Grenoble Cedex 9, France

A condition of the maximum thermoelectric power factor arising in the intermetallic semiconductors with the crystal structure of the MgAgAs type is unambiguously a heavy doping these materials with both the acceptor and/or donor impurities up to the concentrations, when the Fermi level become fixed by the mobility edge of one of the bands with the continuous energies (i.e. conduction or valence band).

G.V. Кorenkova¹, О.М. Scherbatiy², S.А. Nedilko³, О.K. Таdeush¹, V.M. Uvarorov²

Electronic structure LnVO₄ (Ln=Y, Ho)

1 ‘K.D.Ushinskiy’ Southukrainer State Pedagogical University, E-mail:allforme@eurocom.od.ua
2 ‘G.V.Kurdjumov’ Institute physics of metals NАS Ukraine 3 ‘T. Shevchenko’ Kiev National University.

The method of X-ray spectroscopy and by area calculations in LPPH-approach explores electronic structure LnVO₄ (Ln=Y, Ho). Obtained data about the charging and spin performances of atoms, and also about legitimacies of forming of energy bands of the valence states in oxide LnVO₄ (Ln=Y, Ho).

D.M. Freik, V.М. Chobanyuk, О.V. Tkachyk

Crystal-Chemical Models of Amphoter Action of the Ві Admixture in the PbSe Crystals

Department of physics and solid chemistry Precarpathian national university of name of Vasiliy Stefanyk 201, Galitska Str., Ivano-Frankivsk, 76000, Ukraine, E-mail:freik@pu.if.ua

On the basis of the PbSe antistructure the crystal-quasichemical formulas of the crystals of lead selenide alloyed by bismuth are offered that riched by selenium PbSE:Bi and by lead PbSe:Bi accordingly. Dependence of Hall of charge carrier concentration and defects concentration in PbSE:Bi crystals from contain of alloying admixture of bismuth and sub-stoicheometry to selenium are obtaine. It is set by comparison of experimental information and results of quasi-chemical calculations, that compensation of donor action of the bismuth that placed in kationic sublattice is carried out by the twice ionized vacancies of lead.

O.M. Tsendra, V.V. Lobanov

Formation of Carbohydrate Film on the Surfaces of Nanodimension Silica

Institute of Surface Chemistry, National Academy of Sciences of Ukraine, General Naumov Str. 17, Kiev 03164, Ukraine tel. (044)422-96-60, oksynka@mail.ru

Calculations have been carried out of geometric and electronic structures of the ensemble of glucose molecules forming protecting film on the hydroxylated surfaces of silica nanoparticles. A glucose molecule has been shown to interact with two surface silanol groups (the heat effect is of 13 kcal/mol) due to formation of hydrogen bonds. The heat effect does not depend on the number of glucose molecules previously grafted to silica surface what testifies the absence lateral interaction. It has been established that achievement of compacter film using glucose molecules is impossible due to absence of free silanol groups on the surface.

А.V. Bitneva

The Process of Ferritization to the Heat Treatment of Mg, Fe and Cr Hydroxide System

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

The influence of the synthesis conditions on the ferritizing process has been investigated subject to the heat treatment of Mg, Fe and Cr hydroxide system. It has been shown, that the precipitation of Mg, Fe and Cr hydroxides allows the production of extra-fine sinterable Ferrite-Chromites of Magnesium powders, which don’t form solid aggregates, avoiding the additional milling stage.

O.Y. Anan’yina, A.S. Yanovs’ky

Quantum-chamical simulation of SiH4 adsorption on Si(100)–(2x1) surfaces

SSEM Department, Zaporizhzhya National University, Zhukovsky Str. 66, Zaporizhzhya, 69063 Ukraine, e-mail:ananyina@zsu.zp.ua.

The results of quantum-chemical calculations of SiH₄ adsorption on Si(100)–(2x1) surface, are presented in the work. Possible structures formed by silane during adsorption on Si surfaces are discussed. Energy characteristics of bond formation between Si atoms of adsorbed fragments have been estimated. Simulation results were compared with experimental data and other calculations.

Yu. Gnatyuk, J. Manujlov, N. Smirnova, A. Eremenko

Synthesis, Structure and Optical Properties of TiO₂/Ag Thin Films Active in Rodamine B Photooxidation

Institute of Surface Chemistry NASU, 17 Gen. Naumova Str., Kyiv, 03164, Ukraine

Transparent mesoporous TiO₂ and Ag nanoparticles contained TiO2 thin films were prepared via template assisted sol-gel method. Ag+ ions were introduced into titania sol on the preparation stage with following termoinduced reduction to Ag0 state. The films were characterized by UV-Vis spectrophotometry, scanning electron microscopy (SEM) and BET surface area measurements. TiO₂/Ag films with low Ag content exhibit higher photocatalytic activity than unmodified one under UV light irradiation. Ag nanoparticles improve efficiency of charge separation and charge transfer processes, play as traps for photoinduced electrons. Rhodamine B photooxidation follows preferentially through chromophore ring degradation under UV as well as Visible light irradiation.

V.V. Kukueva¹, O.A. Kirillov¹, A.G. Grebenyuk², V.V. Lobanov²

Quantum-chemical research of diethyl amine inhibition action

¹Fire Safety Institute of Chernobyl herois,Onoprienko str., 8, city Cherkassy, 18034,Ukraine,tel. (80472)55-09-62, kukueva@yahoo.com
²Surface Chemistry Institute NАS Ukraine,str.Gen.Naumova , 17, city Kiev, 03164, Ukraine

The destruction ways of diethylamine appeared to be a hydrocarbon fuel combustion inhibitor have been researched by the ab initio calculation with 6-31 G basis set. The best energy of probable destruction ways of inhibitor molecule was shown and was also analyzis the probability of interaction of the destruction products with active sites of flame. It was proved that the destruction of inhibiting particles on silica surface could be easily than that of isolated diethylamine molecule.

D.M. Freik¹, І.M. Ivanyshyn²

Electrovalent States of Stanum and Mechanisms of Formation of Sn_0,984Te-Tl₂Te₃ Solid Solutions

¹ Precarpathian National University named Vasil Stefanik, Galitska St, 201, Ivano-Frankivsk,76008, Ukraine, E-mail:freik@pu.if.ua
² Ivano-Frankivsk State Medical University, Galitska St.,2 , Ivano-Frankovsk,76000, Ukraine, e-mail:Ivan_Ira@rambler.ru

For the help of Mëssbauer Methods is explored the valent states of Tin in the compound Sn_0,984Te. The crystalloquasichemical model of nonstoichiometric Tin Telluride it is proposed. The mechanisms of formation of solid solution Sn_0,984Te-Tl₂Te₃ it is described.

S.V. Yesikova

The Influence of Temperature on Structural Transformation of Mitselarcomplexes in Fusions Oxides of the System Na₂O-B₂O₃

Kherson State University

Extreme dependencies of structural transformations in high-temperature oxide solution of Na₂O – B₂O₃ system were received by means of derivative & graphical method & conclusions about the structure of these solution were made.

V.A. Makara, L.P. Steblenko, Yu.L. Kolchenko, S.M. Naumenko, T.V. Volkova, O.І. Stelmah

Influence of Water Solutions and Chemical Treatment on the Magnetomechanical Effect

Physics Faculty, Taras Shevchenko Kyiv National University, Prospekt Glushkova 2, Building 1, 03680 Kyiv, Ukraine

A study of the influence of water and chemical solutions on the magnetomechanical effect (MME) testifies to magnetic-field-induced enhancement of the adsorptivity of silicon surface and alteration of MME relaxation behavior. It is shown that as a means of controlling changes in adsorption on the silicon surface may be used the microhardness technique.

L.I. Anatychuk, V.V. Malyshko, V.P. Mikhalchenko, V.V. Motskin

Elastic Constants of Bi_0.85Sb_0.15 Alloy At Т=293 К

Institute of Thermoelectricity, Chernivtsi, Ukraine

Ultrasonic pulse method at Т=293 К was applied to measure 14 propagation velocities vi of ultrasonic waves of different polarization pattern in the direction of high symmetry in Bi_0.85Sb_0.15 alloy-based single crystal (trigonal syngony, symmetry class, D53d space group) possessing the highest thermoelectric figure-of-merit among Bi-Sb-alloys. Four of the values vi are used to determine diagonal tensor components of elastic constants Cijkl while the other are applied to determine non-diagonal ones and to assure that the obtained results agree. Using experimental values of the six independent Cijkl components, comprising C11, C33, C44, C12, C13 and C14 (Cij as denoted by Voigt) the following elastic parameters of Bi_0.85Sb_0.15 single crystal were calculated: elastic compliances Sij, Young modules Ei and shear Gi, bulk modules В, linear (i and volumetric (v compressibilities, levels of elastic anisotropy АI and AII, as well Poisson coefficients (i. Obtained elastic parameters can be directly applied to calculate thermal stresses and as well as in design and manufacture of thermoelectric and other devices operating in the wide temperature range. Using Voigt-Reuss-Hill for averaging procedures macroscopic modules Ех, Gх and Вх of polycrystalline Bi_0.85Sb_0.15 alloy were obtained.

M.V. Karpets, S.O. Firstov, L.D. Kulak, I.D. Gorna, N.N. Kuzmenko, G.F. Sarghan

Peculiarity Phase Formation in Rapidly Solidified Al-Fe-Cr Alloys at present Quasicrystalls

Frantsevich Institute for Problems of Materials Science, 3 Krzhizhanovsky Str., Kyiv-142, 03680, Ukraine, e-mail:karp@ipms.kiev.ua

Structure and phase composition of Al-Fe-Cr powders atomized by spining are investigated. As-atomized powders had two phase components: a quasicrystalline phase of icosahedral symmetry and lattice parameter a6 = 0.6484(2) nm, and a fcc phase on base Al. X-ray in situ investigation (monochromatic CuK( radiation) in He environment of powders while heating revealed the occurrence in them of a phase transition Al₆Fe at temperature of 653-673 K. X-ray diffractometric analysis has shown the existence of the Al₆Fe-phase in the given powder sample to a temperature of 823 K. Heating the samples high 823 K was accompanied by the appearance of the stable intermetallics of Al₁₃Fe₄ and Al₁₃Cr₂ type.

Andrzej Sumorek, Wiktor Pietrzyk

Electrostatic Bifilar Deduster for Organic Dust Removing

Lublin University of Technology, Department of Computer and Electrical Engineering 38A, Nadbystrzycka Str., 20-618 Lublin, Poland tel./fax: (+48 81) 53 81 299, E-mail: sumek@elektron.pol.lublin.pl

This paper presents a new solution to unconventional use of bifilar windings. Usually, they are used in metrology because this kind of windings has no inductance. Bifilar windings supplied with DC or AC voltage generates heterogeneous electric field around. This field induces charges in surrounding dielectric particles. The effect of this influence is in the form of mechanical forces attracting particles in the heterogeneous field generated by the winding.

І.І. Popovych¹, Y.P. Sharkan^1,3, М.Yu. Sichka¹, V.О. Kykyneshi², S.О. Коrposh^1,3

Modification of Surface to Titan by Biocompatible Materials With the Help of Laser Radiation

¹Institute Physics and Chemistry of Solid State Uzhgorod National University
² University of Debrecen, Department of Dentistry, Debrecen, Hungary, 4010
³Cranfield University at Kitakyushu, KSRP, 2-5-4F Hibikino, Wakamatsu-ku, Kitakyushu, Japan, 808-0135

The calculations on the basis of theoretical model for laser modification by biocompatible materials to titanium and dependence of modification both on parameters of the laser, and on the physicochemical performances of a modifying material made. Modification by biocompatible materials of a surface to titanium on the developed and created laser system on the basis of the laser from a neodymium is lead.

Sebastian Borucki¹, Andrzej Cichon²

The Influence of a Multilayer Paper-Oil Insulation of Power Transformers on the Measurement Results of Partial Discharges Measured by the Acoustic Emission Method

^1,2Technical University of Opole, Faculty of Electrical Engineering and Automatics, Institute of Electric Power Engineering, 31, Sosnkowskiego Str., 45-272 Opole, Poland e-mail sborucki@po.opole.pl

The paper presents the measurement results of the acoustic emission (AE) generated by partial discharges (PDs) in a system with multilayer electroinsulation partitions. A short review of electroinsulation materials that can be found in a transformer insulation system was carried out and their influence on the AE signals registered was evaluated. The estimation of their influence was made by using the frequency and time-frequency analyses.

I.M. Gasyuk, V.V. Ugorchuk, V.V. Bachuk, I.P. Yaremiy

The thermal doping of α-Fe and Fe₃O₄ and laser modification of nanodispersed TiO₂

Precarpathion National University named after V. Stefanyk, Shevchenko Str.,57, Ivano-Frankivsk, 76000, Ukraine, e-mail:Roman_Ilnittsky@rambler.ru

Experimental results of lithium intercalation processes in fo the cathode is made from initial and laser modified nanodispersed titania are given in the work. The results interpretation on the basic of modern presentation of electrochemistry are given in the work too. The optimum regimes of laser irradion are defenite and the necessary quantity of modifying matter is found for nanodispersed TiO₂. The analysis of discharge characteristics of materials and their use perspectives as cathodes for electrochemical power sources are realised.

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

The Search of Optimal Contents of Carbon Fiber in Polymer Matrix of Antifriction Composite

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

Dependences of dielectric permittivity and dielectrical loss-angle of composite material based on polytetrafluoroethylene and carbon fiber from succession and time of mixing of composite and also mechanical loss-angle from contents of carbon fiber for search of optimal contents of filler in polymer matrix have been researched. It has been ascertained, that the forming of optimal structure of composite material, which corresponds to maximal wearhardness, is near completion, when contents of carbon fiber is over 15 %.

O.I. Syza¹, O.N. Savchenko¹, O.D. Smiyan², L.M. Kapitanchuk²

Nanostructural Processes at Inhibitor Protection of Steel the Modified Vegetable Oil

¹Chernigov State Tehnological University, 14027, Chernigov, 95, Shevchenko str., e-mail:syza@rambler.ru
²E.O.Paton Electric Welding Institute of the NAS of Ukraine, 11 Bozhenko Str, Kyiv, 03150, Ukraine, tel/fax (380 44)227-23-66

The mechanism of protective action inhibitors is found out on the basis of the modified mustard oil in 3 % NaCl (a degree of protection Z = 95-98 %) are developed. The mechanisms of formation nanostructural a film on a surface of steel 20 at inhibitor protection theoretically and experimentally are proved. For the first time the model of structure of a protective film is offered. It is proved, that it has thickness оf 60 - 140 nanometers, a polymolecular structure, non-uniform behind a chemical compound.

І.V. Kolyadenko¹, P.G. Lytovchenko¹, V.Ya. Оpylat², І.V. Petrenko¹, V.P. Tartachnyk¹, V.І. Khivrych¹

Degradation of Gallium Phosphide Light-Emitting Diodes, caused by Radiation Defects

¹ Scientific Centre The Institute of Nuclear Researche NAS of Ukraine
² National Pedagogical University named by M.P. Dragomanov; Institute of Nuclear Researche NAS of Ukraine 47, Nauky Av., Kyiv, 03028, Ukraine, E-mail:opylat@ua..fm

The nature of degradation of luminescence GaP of light-emitting diodes was investigated. Increasing of the VAKH tunneling component is revealed at an irradiation by γ-quantums, and also at long postradiating storage. It is established, that a special role in degradation of a luminescence plays interlevel tunneling of carriers.