PCSS, Т.13, №2, 2012

Abstracts

D.M. Freik, L.I. Nykyruy, O.S. Krynytskiy

Achievements and Problems of Thermoelectricity a. Historical Aspects (Review)

Physicochemical Institute at the Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., Ivano-Frankivsk, 76018, Ukraine

There is a review of historical aspects of thermoelectricity. Determined the most important contributions of famous scientists in field of thermoelectricity who formed the modern fundamentals of thermoelectricity, analyzed the activity of the most famous schools in thermoelectricity, engaged in a form its theoretical foundations, research in the field of thermoelectric material science from the first binary bulk material to new low-dimensional structures. Outlined the current challenges for next solution should be directed efforts of scientists.
Keywords: Thermoelectricity, history of science.

V.I. Boichuk, R.Ya. Leshko, I.V. Bilynskyi, L.M. Turyanska

Linear and Nonlinear Absorption Coefficient of a Spherical Quantum Dot with the off-Central Impurity

Department of theoretical physics Ivan Franko Drohobych State Pedagogical University, Stryiska street, 3, Drhohobych, Lviv region, 82100, E-mail:leshkoroman@mail.ru

The calculation of the energy spectrum of the donor impurity in the spherical quantum dot was conducted as the function of the quantum dot size. The dependence of the electron energy levels on the impurity position in the quantum dot had been studied. The effect of the impurity position in the quantum dot on the dipole momentum and oscillator strength of the interlevel transitions had been analyzed. The linear and nonlinear light absorption coefficient which is caused of the interlevel transition had been defined. The linear and nonlinear light absorption coefficient, which is caused of the interlevel transition, had been defined.
Keywords: impurity, light absorption coefficient.

B.M. Ruvinskii¹, M.A. Ruvinskii²

Interband Conductivity of Doped Graphene in Post-linear Response

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 dynamic conductivity of the doped graphene, caused by the interband resonant transitions, is theoretically investigated depending on the frequency and amplitude of external electric field, the graphene temperature and the concentration of free charge carriers. The obtained results go beyond bounds of the first-order perturbation theory and lead to a saturation of the induced current under rather strong electric fields at the considered general conditions as with the Mishchenko theory for zero temperature and chemical potential. The nonlinear increase of the optical transparency is revealed with rise of the intensity of incident radiation for the doped graphene also.
Keywords: dynamic conductivity,  graphene, external electric field.

A.V. Babich, P.V. Vakula, E.L. Zhavzharov, V.V. Pogosov

Positron Work Function for Metal Surface: a Role of Self-Consistency

Department of Micro- and Nanoelectronics, Zaporozhye National Technical University, Zaporozhye 69064, Ukraine

In the framework of two versions of the density-functional theory (the gradient expansion, the self-consistent Kohn-Sham equations) and stabilized-jellium model the positron work function for Al, Cu and Zn crystal faces with dielectric coating has been calculated. The obtained results are very susceptible to a self-consistency of the procedure. We show that the dielectric coating of the metal surface leads to the change in the sign of the positron work function.

O.A. Kulinich

Dislocation Nets as Basis of Bellow-Structure is in the Deformation Methods of Receipt of Quantum Points

Ukraine, Odesa, 65082,Odesa state economic university, street of Preobrazhenskaiy, 8, e - mail: koeltech @ i.ua

In this work on the basis of the use of modern methods of researches in combination with the methods of chemical selective etch, the structure of resurface layer of silicon was studied after oxidization and ionic alloying, which was from an area polycrystalline silicon and area containing dislocation nets. The comparative analysis of properties of dislocation nets arising up at oxidization and alloying is conducted. It is shown that dislocation nets can serve as basis for creation of bellow (intermediate) of structure in the different deformation methods of receipt of quantum points.
Keywords: silicon, oxidization, ionic alloying, defects, dislocation nets.

N.L. Dmitruk, S.Z. Malynych

Microcontact Surface Modification for Self-Assembled Nanoparticle Arrays

V.E. Lashkaryov Institute for Semiconductors Physics NAS of Ukraine, 41 Nauky Ave., Kyiv 03028, Ukraine

In present work, we discuss a simple way to pattern a flat surface with poly(vinylpyridine) (PVP) via soft-lithography technique. We explore ’put-down’ microcontact technique employing poly(dimethylsiloxane) (PDMS) resin as a stamp. CDs and DVDs were used as a master for elastomeric mold preparation. To achieve smaller scale of the pattern we also used a diffraction grating as a master. PDMS mold was dipped into the PVP solution in ethanol followed by drying of the mold and printing on clean glass or Si wafer substrates. Even better result was achieved when the mold was applied to a thin PVP layer poured onto glass surface and then transferred to another substrate. Those polymer patterns were used for assembling of 100 nm silver nanoparticles. The described approach can be effectively used for the fabrication of various nanostructures.
Keywords: nanolithography, silver nanoparticles, optical spectra, localized plasmon resonance.

A.G. Grebenyuk ¹, T.O. Parashchuk², V.M Chobanyuk², D.M. Freik²

Ab initio Calculations on the Thermodynamics Parameters of Zinc Telluride Phase Transitions

¹Chuiko Institute of Surface Chemistry of National Academy of Sciences 17, General Naumov Street, 03164 Kyiv, Ukraine
² Physical-Chemical institute, Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., 76018, Ivano-Frankivsk, Ukraine, E-mail: freik@pu.if.ua

Molecular models for zinc telluride polymorphs have been designed. Based on the results of quantum-chemical ab initio calculations of the spatial structure and properties of nanostructures, the formation enthalpies of sphalerite and wurtzite have been found. Phase transformations temperatures have been evaluated.
Keywords: zinc telluride, sphalerite, wurtzite, quantum chemistry, computer simulation.

S.I. Budzulyak, O.P. Lotsko, N.D. Vahnyak, S.M. Kalytchuk, D.V. Korbutyak

Transformation of Exciton-Impurity Complexes in Single Crystals CdTe: Cl Under the Influence of Gamma Irradiation and Thermal Annealing

V.E. Lashkaryov Institute of semiconductor physics, 03028, Kiev, 41 Prospect Nauky

Influence ofγ-irradiationandthermalannealingon thetransformation of theexciton-impurity complexesinsingle crystalsof cadmium telluridedoped withchlorinehas been analyzed by the methodof low-temperature photoluminescence. Non-monotonousdependenciesof integralintensity ofphotoluminescence(PL) vsdose of γ-irradiation indicatecrystal structureradiation-stimulated ordering (the low-doseeffect). Maximum annealing temperature (T ≈ 170°C) has been calculated on basis of temperature dependencies of the photoluminescence spectra set. Significant impurity-defect structure changes should appear in CdTe:Cl after this maximum exceeding.

A.M. Boychuk, M.J. Sichka, P.O. Sulym, V.A. Tsap, M.I. Gasyuk

Temperature and Frequency Dependences of Electrical Properties of Heterovalent Replaced Lithium - Manganese Spinel

Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine email: bojchukam@rambler.ru

Investigated temperature – frequency of electrical properties of modified by iron lithium manganese spinel. Found out, that the distribution of cations and defects which are formed due to heterovalent substitution influence on electrical conductivity of complex manganese oxides. It is shown, that the conductivity at low temperatures is resulting of electron’s jumps between atoms of different valence within octahedral sublattice.
Keywords: heterovalent replacement, impedance, electrical conductivity.

V.S. Bushkova, A.V. Kopayev

Magnetization Process of Ferrite-Piezoelectric Composites of (1-x) MgFe₂O₄ – x BaTiO₃

Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine, E-mail:bushkovavira@rambler.ru

The processes of magnetisation of composites (1-x) MgFe₂O₄ – x BaTiO₃ were studied experimentally at room temperature. It was found that the maximum magnetic permeability and the saturation magnetization of magnesium ferrite is equal to 58 and 11,7•104 А/m respectively. It was shown that with increasing concentrations of ferroelectrics in the composite the residual induction decreases and changes coercive force due to increasing non-magnetic particles. The processes of magnetisation of investigated composites is described in the frame of Kersten model.
Keywords: ferrite, magnetoelectric composite, hysteresis loop, the bulk magnetization curve.

R.O. Dzumedzey¹, I.V. Gorichok¹, L.I. Nukuruy¹, M.O. Galushak²

Features Thermoelectricity of Solid Solutions Pb_1-xSn_xTe (х=0,4; 0,5; 0,6)

¹Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., Ivano-Frankivsk, 76018, Ukraine, E-mail:fcss@pu.if.ua
²Ivano-Frankivsk National Technical University of Oil and Gas, 15, Karpatska Str., Ivano-Frankivsk, 76019, Ukraine

Investigation results of kinetic parameters (coefficients of thermal emf, electrical conductivity, thermal conductivity and figure of merit) samples Pb1-хSnхTe with different composition x = 0.4, 0.5 and 0.6 made by metal method.
Keywords: solid solution, kinetic parameters, synthesis, fraction.

A.D. Zamkovets, P.P. Pershukevich

Spectra-Luminescent Properties of Plasmonic Nanocomposites at a Low-Intensive Lamp Excitation

Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus; e-mail:a.zamkovets@dragon.bas-net.by

The spectral-luminescent properties of structurally organized nanocomposite Ag-KCl, Ag-ZnS, and bordering on the air Ag nanostructures and thin films of ZnS have been studied. Luminescence of Ag nanoparticles densely-packed monolayers in the spectral range 550 – 750 nm at low-intensive (a power density of 10 mW/cm²) 450 nm lamp excitation have been registered.
Keywords: luminescence, metal nanocomposites, surface plasmon resonance.

Ya.P. Saliy, V.V. Bachuk, D.M. Freik, I.M. Lishynskiy

Models of Surface Topology and Kinetics of the Process of Growth of Nanocrystalline Structures PbTe on Chips of Mica-Muscovite

Physical-Chemical Institute of Carpathian National University V.Stefanyk, street. Shevchenko, 57, Ivano-Frankivsk, 76000, Ukraine, E-mail:fcss@pu.if.ua

The work on the basis of modeling surface of the film analyzed the results of investigations of atomic - force microscopy topology of the surface of epitaxial films of Lead Telluride, grown from the vapor phase by hot wall of chips (0001) mica - muscovite marks STA. The peculiarities of the kinetics of the formation of surface nanocrystalline pyramids. Determined activation energy Wagner unimolecular mechanism of growth of surface clusters. The process of surface growth of nanoclusters RTe by deposition temperature Tp = (350 - 630) K are carried out overlapping trigonal pyramids with facets of {100}.
Keywords: modeling, nanostructure, lead telluride, kinetics of the process of growth.

B.S. Dzundza

Interfaces Influence on the Charge Carriers Scattering in Lead and Tin Telluride Films

Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine, E-mail:fcss@pu.if.ua

Researched the interfaces influence on the charge carriers scattering in lead and tin telluride films deposited on substrates with polyamide substrate on their thickness are. Established that the dominant role played scattering on the surface and inter-grain borders.
Keywords: lead telluride, tin telluride, scattering, motility.

D.M. Freik, О.L. Sokolov, I.M. Lishynskiy, I.S. Bylina

Structure of Thin Films of Cadmium Telluride on Glass and Pyroceramics Substrates in the Method of "Hot Wall"

Physical-Chemical Institute at the Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., Ivano-Frankivsk, 76018, Ukraine

By atomic force microscopy investigation of the peculiarities of formation cadmium telluride films on glass and pyroceramics substrates in the method of "Hot Wall".
 Keywords: lead telluride, nanostructures, the processes of growth, a steam phase.

Ya.S. Yavorskiy¹, B.S. Dzundza¹, G.D. Mateik², O.B. Kostuk¹, A.I. Tkachuk¹

Near-Surface Layers and Profiles of Electric Parameters of Thin Films PbTe:Sb

¹Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine, E-mail:freik@pu.if.ua
²Ivano-Frankivsk National Technical University of Oil and Gas, 15, Karpatska Str., Ivano-Frankivsk, 76019, Ukraine

Investigated the distribution of the thickness and effective local thermoelectric parameters of thin films of PbTe:Sb, grown from the vapor phase by open evaporation in a vacuum at sital substrates. It is shown that an important role in the formation of surface layers of the atmosphere plays oxygen, which creates additional acceptor centers.
Keywords: thin films of lead telluride, resistivity, mobility, doping.

V.M. Kaurkovska, V.V. Lobanov

Effect of Bulk Phase on the Electronic Structure of Vanadium Dioxide Surface: a Quantum-Chemical Study

A.A. Chuiko Institute of Surface Chemistry of National Academy of Sciences, Gen. Naumov Street 17, 03164 Kyiv, Ukraine, e-mail:kavn@ukr.net

The models for isomeric 16VO₂ 14H₂O structures displaying surface (К1) and bulk (К2) phases of vanadium dioxide have been designed. Maps of electrostatic potential and field intensity at VO₂ surfaces have been calculated. It has been found that the greater number of coordination spheres in cluster K2, the lesser distance corresponding to the maximum of interaction energy between the surface and positively charged probe particles. Probable surface field ionization of water molecules has been shown to take place followed by disintegration of molecular ion Н2О⁺ into proton and radical ОН.
Keywords: quantum chemistry, isomeric structures, electrostatic potential, water adsorption, field ionization.

M.O. Shevchuk, I.V. Gorichok

Energies of Formation of Monovacancies in the Monochalcogenides of Samarium and Europium

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

On the basis of data thermochemistries energies of formation of cations and anion monovacancies are calculated in the samarium and europium monochalcogenides. It is set that deformations of crystalline grate at the околі vacancies of metal and chalcogen are insignificant and does not substantially influence on their energies of formation

R.O. Denysyuk¹, V.M. Tomashik², Z.F. Tomashik², V.I. Grytsiv¹

Chemical Interaction of Cd_1-xMn_xTe with Н₂О₂–НІ–Lactic Acid (С₃Н₆О₃) Etchant Compositions

1Ivan Franko Zhytomyr State University 2V.Ye Lashkaryov Institute of Semiconductor Physics of NAS of Ukraine

In reproducible hydrodynamic conditions the kinetics of CdTe and Cd_1-xMn_xTe dissolution NI–H₂O₂–lactic acid has been studied. The surfaces of equal etching dissolutions (Gibbs diagrams) have been constructed and the regions of polishing, selective and non polishing solutions have been determined. Limiting stages of the mention above semiconductors dissolution have been defined. Rates of the chemical mechanical polishing of the Cd_1-xMn_xTe solid solutions by the H₂O₂–HI–lactic acid etchants has been determined and the influence of the dilution of the base polishing etchants by the viscous solvents on the polishing properties and the surface quality of semiconductors has been defined.

Zh.I. Milyan, O.Yu. Khyzhun

Crystal Structure, Electric and Thermoelectric Properties of Quaternary Chalcogenides of Transition Metals Cu₂B^IITi₃S₈ (B^II–Cr, Mn, Fe, Co, Ni)

¹Instytut Physics and Chemistry of Solid State, Uzhgorod National University,Str. Pidgirna, 46, Uzhgorod, Ukraine
²Institute of material problems NASU, 3 Kryganovsky vul., Kiev,03680

Some electrical and thermoelectrical properties of poorly investigated complex thiospinels Cu₂B^IITi₃S₈ (B^II–Cr, Mn, Fe, Co, Ni) were studied. Main parameters of quaternary compounds, peculiarities of their electroconductivity, thermo-emf were determined. The sign of thermo-emf indicates that all these compounds are n-type semiconductors. Physical model that explains the mechanism of dependence of specific electroconductivity on the nature of chemical element B^II is proposed.
Keywords: thiospinel, сrystal structure, electroconductivity, thermo-emf.

G.Ya. Gurgula, T.P. Vintonjak, N.D. Freik

Own and Impurity Defects in Crystals ZnTe: In

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

A Crystal-formulas defined dominant point defects in solid solutions ZnS_xTe_1-x for n-and p-type conductivity output binary compounds ZnS and ZnTe. Dependence of the concentration of defects, free carriers and Hall concentration on the composition of the solid solutions.

V.А. Romaka^1,2, P. Rogl³, E.K. Hlil⁴, Yu.V. Stadnyk⁵, L.P. Romaka⁵, О.І. Lakh⁶, A.M. Horyn⁵

Electrokinetic Properties of Semiconductive Substitutional Ti_1-xDy_xNiSn Solid Solution

¹Pidstryhach Institute of Applied Problems of Mechanics and Mathematics, National Academy of Sciences of Ukraine, Lviv, 79060 Ukraine
²National University “Lvivska Politechnika”, Lviv, 79013 Ukraine
³Іnstitut fur Physikalische Chemie, Universitat Wien, A-1090 Wien, Austria
⁴Іnstitut Neel, CNRS, ВР 166, Grenoble 38042, France
⁵Ivan Franko National University of Lviv, Kyryl & Mephodiy Str., 6, 79005, Lviv, Ukraine
⁶CJSC “SPA «THERMOPRYAD» named after V.Lakh” 3, Naukova str., 79060, Lviv, Ukraine

Temperature dependences of еlectrical resistivity and thermopower for the Ti_1-хDy_xNiSn substitutional solid solution were investigated in the 80÷380 K temperature range. Obtained experimental results well correlate with forecast estimations, made from calculations on electronic structure of Ti_1-хDy_xNiSn.
Keywords: semiconductor, electrical resistivity, thermopower, Fermi level.

M.P. Vadyuk, G.Ya. Gurgula, L.Yo. Mezhylovska

Features of the Defect Subsystem Isovalent Doped Zinc Selenide Crystals ZnSe: Te

Physical-Chemical Instituteatthe‘VasiliyStefanyk’PrecarpathianNationalUniversity, 201, GalytskaStr., Ivano-Frankivsk, 76000, Ukraine, E-mail: freik@pu.if.ua

The crystal-quasichemical formulae of doping at the Crystals n-ZnSе:Те аnd p-ZnSе:Те are suggested. The dependence on point defects concentration, on free charge carrier concentration and Hall concentration of the degree of nonstoichiometry (α, β), zinc in knots of a crystalline lattice (γ) and in interstices (ε), and also coefficients of disproportionation of interstitial atoms of zinc (δ) and vacancies of zinc (μ) are calculated.

B.K. Ostafiychuk, I.M. Budzulyak, N.Y. Ivanichok, R.P. Lisovskyy B.I. Rachiy, R.I. Merena

The Genesis of The Porous Structure of Carbon From Plant Material due to Temperature Activation

Vasyl Stefanyk PreCarpathian National University, 57 Shevchenko Street, Ivano-Frankivsk, 76025, Ukraine G.V. Kurdyumov Institute for Metal Physics National Academy of Sciences of Ukraine, Kyiv, Academician Vernadsky Boulevard 36, 03680, Ukraine

The dependences the pore size distribution (BJH method) and specific surface values (BET method) from the synthesis conditions of porous carbon material (PCM) are established by analysis of low-temperature (77 K) nitrogen adsorption-desorption isotherms. It is shown that the optimal ratio between micro- and mesopores is obtained at temperature synthesis of 800°C during 180 min of thermal activation. The value of specific surface area is 673 m²/g.
Keywords: porous carbon material, hydrothermal carbonization, thermal activation.

O.I. Aksimentyeva¹, I.Ye. Opaynych¹, V.P. Dyakonov^2,3, S. Piechota², V.P. Zakordonskyi¹, P.Yu. Demchenko¹, H. Szymczak²

Structure and Thermal Stability of the Polymer - Magnet Nanocomposites

¹Ivan Franko National University of Lviv, 6/8 Kyryla-Mefodia, Lviv, 79005, Ukraine; aksimen@ukr.net
²Institute of Physics of Polish Academy of Science , Al. Lotnikov 32/46, Warsaw, 02-668, Poland
³ Galkin Physical-Technical Institute of NASU, 72 R. Luksemburg, Donetsk, 83114, Ukraine

It is studied a structure and thermal behavior of the hybrid polymer magnetic composites based on a high dispersive magnetite and polystyrene - butyl acrylate copolymer obtained by suspension polymerization. According to structural studies, the nanostructure of composite is formed in results of encapsulating of the magnetite particles by the polymer shells. A thermal behavior of the hybrid composite indicates the several stages of thermal decomposition process and significant reduction in the thermal stability of the copolymer matrix under the influence of magnetite.
 Keywords: hybrid nanocomposites, magnetite, styrene - butyl acrylate copolymer, thermal destruction, structure.

I.S. Petryk¹, N.P. Smirnova¹, A.M Yeremenko¹, O.K. Frolova², O.I. Oranska¹

Synthesis of Nanoscale Mesoporous Films TiO₂/Cu^{2 +} and Their Photocatalytic Activity in the Reaction of Ions Cr (VI)

¹Institute of Surface Chemistry. О.О. Chuiko NAS of Ukraine, Str. General Naumov, 17, Kyiv, 03164, Ukraine
² Institute of Physics NAS Ukraine, Prospect Nauki, 46, Kyiv, 680028, Ukraine

TiO₂ - based functional coatings doped with Сu nanoparticles were prepared via template assisted sol-gel method. The films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis spectroscopy. Prepared coatings with anatase structure (sizes of crystallites 8-15 nm depending on Cu concentration) have a high optical quality and mechanical stability. Cu²⁺ ions introduction into titania precursor sol accelerate TiO₂ crystallisation and improved photocatalytic activity of Cu/TiO₂ films in the process of Cr(VI) to Cr(III) photoreduction up to 7% Cu content. Further increase of Cu content leads to decrease of photocatalytic activity.

S.N. Fedosov, A.E. Sergeeva

Electret Effect In Thin Films Polietilenteraftalat

Odessa National Academy of Food Technologies, ul. Kanatnaya, 112, Odessa, 65, Ukraine , e-mail:fedosov@optima.com.ua

The electret effect in PET films has been studied by using measurements of isothermal charging and discharging currents in PET films poled at different voltages and temperatures, the calculation of dielectric relaxation parameters at infra-low frequencies by the Hamon method, and measuring TSD currents,. It has been found that the internal polarization (heterocharge) in PET is less stable than the homocharge. A qualitative model of the electret effect in PET films has been proposed.
Keywords: electrets, poling, PET, TSD, homocharge, heterocharge.

O. Ananina, E. Severina, O. Yanovsky

Boron Atoms Behaviour in Diamond С(100) Subsurface Layers

Semiconductor Physics Department, Zaporizhzhya National University, Zhukovsky Str. 66, Zaporizhzhya, 69600 Ukraine, e-mail:ananyina@znu.edu.ua.

The goal of present work is simulation of possible structures, formed by boron atoms which were implanted in diamond during CVD grows. Using quantum-chemical calculations we have studied the geometry and electronic states of the C(100) subsurfaces with boron atoms. The energy more favorable states of surface with implanted boron atoms have been estimated.

I.I. Grygorchak, D.V. Matulka, F.O. Ivashchyshyn

Сlathrate Charge and Energy Transfer in Supramoleculer Assembley of Inorganic Semiconductor/ Organic DA Complex

Lviv Polytechnic National University, vul. S.Bandery, 79013, Lviv, Ukraine e-mail : Ivangr@rambler.ru

The possibility of formation of such supramolecular complexes as inorganic semiconductor / organic receptor with use of intercalation technologies is presented in this work. Lamellar semiconductors gallium selenide and indium selenide were objects of research. These compounds were used as the host matrix. Molecules of organic receptor rhodamine 6G and methylene blue were used as guest component. The results of impedance spectroscopy of experimental samples are represented. Equivalent electrical circuits were built according to obtained results.

V. Zabludovskiy, R. Ganich, V. Artemchuk

Investigation of Structural Transformations in Alloys Obtained in Nonequilibrium Conditions Electrocrystallization

Dnepropetrovsk national university of railway transport named academician V. Lazaryan,
Dnepropetrovsk, street of akad. V. Lazaryan, 2. E-mail:art_vv@ukr.net, (067)5659803

Methods of X-ray diffraction and differential thermal analysis of the effect of pulse current regimes on the structure and thermal stability of electrodeposition of alloys. Found that in this concentration range with increasing phosphorus content in the alloy solidification start shifting to the region of higher temperatures. Determined that the final decomposition products during the crystallization of amorphous alloys is the equilibrium phase , , and . It is shown that the formation of amorphous and microcrystalline structure and processes of structural relaxation substantially affect non-equilibrium conditions of crystallization caused by the size of cathodic overvoltage by pulsed electrodeposition.

I.Ya. Petryk¹, V.Ya. Loburak¹, M.I. Dydyn², I.Yo. Perkatyuk³

Kinetics of Formation of Diffusion Coatings on Steel 50 and 12H18N10T with the
Previous Decarbonization of the Surface

¹Ivano-Frankivsk National Technical University of Oil and Gas, Carpathian, 15 St. Ivano-Frankivsk, 76019, Ukraine
²Uzhhorod National University, Pidgirna, 46 St., Uzhgorod, 88000, Ukraine
³‘Vasyl Stefanyk’ Precarpathian National University, Shevchenko, 57 St., Ivano-Frankivsk, 76025, Ukraine

We compared process decarbonization Steels 50 and 12X18H10T by annealing in hydrogen atmosphere and the diffusion of the iron with the mix powder. We proposed the mathematical model of kinetics of formation of diffusion coatings, using the concentration of impurity elements in steel.

B.P. Yatsyshyn¹, N.I. Domantsevich¹, S.P. Yatsyshyn²

Increase o f Reliability of Devices Operation at Use of Sensitive Elements on the Basis of Intermetallic Compounds

¹ Lviv Academy of Commerce 10, Tugan Baranovsky, Str. Lviv, 79008, Ukraine bogdan.yatsyshyn7@gmail.com
²National University “Lvivska Politechnika”, Bandera Str. 12, 79013 Lviv, Ukraine

It is investigated features of temperature dependence of resistivity of crystalline thin films NiGe with hafnium additives. It is analysed the physical parents which cause degradation and changes of sensors gradual characteristics.

V.V. Brus¹, M.I. Ilashchuk², Z.D. Kovalyuk¹, P.D. Maryanchuk², K.S. Ulyanytsky², B.M. Gritsyuk²

A Solar Cell Based on a Heterojunction n-ТіО₂/p-CdTe

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

Photosensitive n-ТіО₂/p-CdTe heterojunctions were fabricated by DC reactive magnetron deposition of TiO₂ thin films with n-type conductivity onto freshly cleaved p-CdTe single crystal substrates (110). Methods of formation of ohmic contacts to n-TiO₂ and p-CdTe were proposed and their ohmic properties were tested. The solar cell possesses the following photoelectrical parameters under 100 mW/cm² illumination: the open-circuit voltage Voc = 0.69 V, the short-circuit current Isc = 6 mA/cm2 and fill factor FF = 0.42.  Keywords: solar cell, thin film, TiO₂, CdTe.

S.P. Nonosyadlyy, S.M. Marchuk, Yu.V. Voznyak, T.R. Sorokhtey

The Efficacy Hetero Technologies in the Structures of Gallium Arsenide

Precarpathian National university after Vasyl Stefanyk 57 Shevchenka str, Iano-Frankivsk, Ukraine, e-mail:majesty@nashemisto.if.ua

In silicon VLSI technology forming structures to change the effective action of hetero-quantitative characteristic parameter defined growth lifetime of minority carriers [1]. This allows to equate respectively to action as quantitative in nature, with which you can evaluate the effectiveness of heter technologies in relation to gallium arsenide. This option is selected Hall mobility of charge carriers. These data are particularly relevant today in determining the formation of technology semi-combining K-MOS structures on epitaxial gallium arsenide.

R.I. Nykyruy, М.А. Lopyanko, V.Yu. Potyak

Gas-Dynamical Steam of Stream Parameters of the Zinc Sulphide in Cylindrical Channel

Physical-Chemical Institute at the Vasyl Stefanyk PreCarpathian National University, 57, Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine, E-mail:freik@pu.if.ua

There are the analytical describe of the basic gas-dynamical steam of stream parameters in cylindrical channel and calculate their profiles for the zinc sulphide due the geometrical sizes of chamber, temperature gradient along walls, type of materials, and evaporation temperature.

V.V. Brus¹, Z.D. Kovalyuk¹, P.D. Maryanchuk²

Determination of the Value of a Serial Resistance from Volt-Capacitance Characteristics

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

The effect of the serial resistance of structures with potential barriers on their capacitance properties was analyzed. A method for determination of the value of the serial resistance from volt-capacitance characteristics measured at different frequency of the excitation signal was proposed.
Keywords: serial resistance, structure, impedance.

H.O. Sirenko, L.M. Soltys, M.B. Skladanyuk

Physical and Chemical Copper Plating Processes of Carbon Fibers based on Hydrate Cellulose and Influence them on Change the Microroughness of Conjugated Surfaces the Polymer Composite – Metal in Friction and Wear

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

It has been shown that the allocation of heights of peaks and average curvature in the peaks microirregularities surfaces of samples of polymer composites and metal counterfaces depend on the initial moments of the spectral density and the formation on the conjugated metal surfaces of the intermediate films. These allocations change in friction and wear of the friction way from 0 to 1200 km, with the change of allocations is oscillatory in nature, approaching and keeping away from the normal allocation Gauss. Coatings of carbon fibers by copper by zinc technology significantly affects on the processes of formation of films on the surface of metal counterface and changes the allocation of heights of peaks and average curvatures in the peak of microirregularities as counterface well as polymer sample.
Keywords: carbon fibers, friction, wear, roughness of surface, composite polymer material, spectral density, metal counterface.

D.M. Freik, Ya.S. Yavorskiy, V.Yu. Potyak, R.S. Yavorskiy

Sectional Vacuum Heaters for Vapor-Phase Condensates

Vasyl Stefanyk PreCarpathian National University 57, Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine, E-mail:freik@pu.if.ua

The designs vacuum section heaters, you can use to precipitate vapor phase methods of thin films and nanostructures of semiconductor compounds as different thickness at a given temperature deposition and the same thickness at different temperatures of deposition in a single technological cycle without depressurization of the vacuum system.
Keywords: thin film, vacuum heaters, vapor phase techniques.

O.V. Kuzyshyn, H.O. Sirenko

New Procedure of the Investigation of Chemically Modified Rape Oil in Lubrication of Solid States on the Four-Ball Friction Machine

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
 

Methods and criterions of estimation of lubricating capacity of lubricants on the four-ball friction machine have been generalized. The three variants of newest methods of investigation on the four-ball friction machine have been studied. Using the newest methods, were found 2 peaks which relate to critical loading of different character – destruction of physical adsorptive layer (first peak) and chemical adsorptive layer (second peak). It has been determined that positive displacement of peaks depends on the modulus of oxyethylation of rape oil. The maximum effect occur under the sulfurization when using 3,5% S. The displacement of first peak in comparison with unmodified rape oil proceeds on 1069 N and of second – 4063-4802 N.
Keywords: rape oil, friction, wear, sulfurization, oxyethylation, four-ball friction machine.

O.V. Morushko¹, M.Y. Sehin², L.S. Yablon¹, I.M. Budzulyak¹, O.R. Kyslyak²

Thermodynamic and Kinetic of Processes Intercalation Current in Thermally and Laser Modified Nanodispersed TiO₂

¹Stefanyk Precarpathion National University, 57, Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine
² Ivano-Frankivsk National Medical University,2,Halytska, Ivano-Frankivsk, 76000, Ukraine

It is modified matrix of titania in turn of the thermal and laser treatments. The dependence of Gibbs energy change of the intercalation reaction of lithium with the guest load degree change was analyzed. The characters of the kinetic processes intercalation current in this structure were determined.

L.V. Bazyuk, H.O. Sirenko

Thermophysical Properties of Metals and Alloys: 4. Linear Coefficient of Thermal Expansion Dependence from Temperature and Radius of Atoms

1Vasyl Stefanyk’ Precarpathian National University, 57, Shevchenko Str., Ivano-Frankivsk, 76025, Ukraine Tel. (0342) 77.64.15; (096) 813.93.53, e-mail:sirenkog@rambler.ru

The dependence of linear coefficient of thermal expansion from temperature, serial number and radius of atom of metals has been analyzed and proved by correlation and regression analysis. It is shown that with increasing temperature for most metals and alloys linear coefficient of thermal expansion іncreases. Established that growth between linear coefficient of thermal expansion and the radius of metal atoms no linear connection between a metals of periodic elements at temperatures 100, 200, 300 and 800 K is close linear relationship.
Keywords: metals, alloys, linear coefficient of thermal expansion, thermophysical properties, radius of metal atoms, correlation analysis, regression analysis.

S.G. Orlovska

Influence of Fuel Mass Concentration and Reactions in-Pores on High Temperature Heat and Mass Transfer in Coal Dusts

I.I. Mechnikov’s Odessa National University, Odessa, 65082, Ukraine, (048) 723-62-27

The effect of the reactions in pores is studied on coal particles combustion characteristics: the ignition delay, the burning time and the temperature, the critical parameters of the particles ignition and extinction. It is established that taking into account of the reactions in-pores leads to significant decrease of the ignition delay as well as the particles ignition and extinction critical diameters and the fuel critical mass concentrations. It is shown that the fuel mass concentration range corresponding to full burn-out is appreciably larger in case of the porous particles dusts. It is found that the fuel mass concentration affects ambiguously on the dust ignition delay.
Keywords: high temperature heat and mass transfer, coal particles dust, porosity, mass concentration, ignition and extinction critical parameters.