Періодичні видання СумДУ
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Item Piezoelectric Properties of Barium Titanate Langmuir Films(Sumy State University, 2016) Kuzmenko, A.P.; Chuhaeva, I.V.; Abakumov, P.V.; Dobromyslov, M.B.Langmuir films from stabilized barium titanate nanoparticles have been produced. The processes of polarization and polarization reversal of ferroelectric coatings obtained were studied. The inverse piezoelectric effect has been recorded and its quantitative characteristics have been determined.Item Structural Phase Transition in CdSb + 3 % MnSb Composite at a High Hydrostatic Pressure(Sumy State University, 2015) Dzhamamedov, R.G.; Mollayev, A.Ju.; Kochura, A.V.; Abakumov, P.V.; Arslanov, R.K.; Marenkin, S.F.; Dobromyslov, M.B.In CdSb + 3 % MnSb composite, structural properties have been studied, specific resistance ρ and Hall coefficient RH are measured at a high hydrostatic pressure of up to P ≤ 9 GPa. An irreversible structural phase transition is found at barometric dependencies p(P) and RH(P). From our experimental data, barometric dependencies of carrier concentration and their mobility are calculated. On the basis of the heterophase structure – effective medium model, characteristic points and parameters of the phase transition, and also dynamics of variation of the initial phase volume C1 as a function of pressure are computed. The latter dependence is in agreement with the investigation results of Raman scattering before and after application of pressure.Item Growth and Сharacterization of Cd3As2 + MnAs Сomposite(Sumy State University, 2015) Kochura, A.V.; Marenkin, S.F.; Ril, A.I.; Zheludkevich, A.L.; Abakumov, P.V.; Knjazev, A.F.Bulk samples of cadmium arsenide and manganese arsenide alloys were synthesized by crystallization from double-component melt. According to data of differential-thermal and X-ray phase analysis, the nature of the interaction between Cd3As2 and MnAs is eutectic; the melting temperature of eutectic is 855 K. The samples were ferromagnetic with Courier temperature of 320 K. By vacuum-thermal evaporation from the alloy of the composite, films Cd3As2 + MnAs have been obtained. The distribution of the elements in them was uniform and the composition corresponded to the initial composition. The films consisted from nanocrystallites with a size of 20 to 50 nm.Item Temperature Influence on the Properties of Thin Si3N4 Films(Sumy State University, 2015) Zakhvalinskii, V.S.; Abakumov, P.V.; Kuzmenko, A.P.; Chekadanov, A.S.; Piljuk, E.A.; Rodriguez, V.G.; Goncharov, I.J.; Taran, S.V.Applying Raman spectroscopy, small-angle x-ray scattering, and atomic force microscopy it were studied phase composition and surface morphology of nanoscale films Si3N4 (obtained by RF magnetron sputtering).Item An Analysis of the Deposition Process and the Structure of Ferroelectric Langmuir Films of Barium Titanate(Sumy State University, 2015) Kuzmenko, A.P.; Chuhaeva, I.V.; Abakumov, P.V.; Dobromyslov, M.B.; Emelyanov, N.A.The paper analyzes the process of formation and subsequent deposition of monolayers stabilized in sodium oleate nanoparticles of barium titanate. X-ray diffractometer studies conducted particle size distribution of the ferroelectric particles deposited. Probe technique was used to study the effect of matter and the wettability of the underlayer on the structure and quality of deposited coatings. The possibility of recording ferroelectric domains produced thin Langmuir films of barium titanate.Item Synthesis and investigation of nanoscale structured magnetic A II(3)BV(2):Mg films(Sumy State University, 2014) Kochura, A.V.; Marenkin, S.F.; Fedorchenko, I.V.; Abakumov, P.V.Semiconductor Zn3As2 and Cd3As2 films doped with manganese were grown by vacuum thermal deposition on sapphire and silicon substrates. Structural and magnetic investigations showed the presence of ferromagnetic semimetal nanoprecipitate MnAs with Curie temperature about 308 К.Item Interrelation of Shape and Structure of Domain Walls with Magnetic Inhomogeneities(Сумський державний університет, 2013) Kuzmenko, A.P.; Abakumov, P.V.; Roslyakova, L.I.; Dobromyslov, M.B.By using atomic force microscopy (resolution of 40 nm) the effect of surface roughness and internal inhomogeneities on the fine structure of domain walls of different types in thin transparent orthoferrite samples cut perpendicular to the optic axis for YFeO3 and axis [001] for DyFeO3 has been studied. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33666Item Influence of Electroconvection on Nano- and on Microstructural Relief of the Electrodes Surface(Сумський державний університет, 2013) Zhakin, A.I.; Kuzko, A.E.; Kuzko, A.V.; Abakumov, P.V.Experimental results on degradation of nano-structural plane electrode surface at electroconvection in working liquid ПМС-50 with iodine are presented. It is shown there are various surface iodine structure courses by electrochemical processes on electrode surface. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33657Item Justification of Visualization Technique of Domain Structure with Raman Scattering(Сумський державний університет, 2013) Kuzmenko, A.P.; Abakumov, P.V.; Dobromyslov, M.B.; Шумакова, Наталія Іванівна; Шумакова, Наталия Ивановна; Shumakova, Nataliia IvanivnaQualitative mechanism in line with experimental data on visualization of the domain structure and fine structure of the domain wall in weak ferromagnets has been proposed. The mechanism is based on the phenomenological consideration of Faraday rotation, optical absorption, and atom polarization in response to the radiation exciting Raman scattering. Qualitative agreement of estimates on the scattered radiation intensity in oppositely- magnetized domains with experimental results is good, which made it possible to attack problems of visualization of magnetic entities with nanoscale resolution. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/31973Item Stress Topology within Silicon Single-Crystal Cantilever Beam(Сумський державний університет, 2013) Kuzmenko, A.P.; Timakov, D.I.; Abakumov, P.V.; Однодворець, Лариса Валентинівна; Однодворец, Лариса Валентиновна; Odnodvorets, Larysa Valentynivna; Dobromyslov, M.B.Qualitative mechanism in line with experimental data on visualization of the domain structure and fine structure of the domain wall in weak ferromagnets has been proposed. The mechanism is based on the phenomenological consideration of Faraday rotation, optical absorption, and atom polarization in response to the radiation exciting Raman scattering. Qualitative agreement of estimates on the scattered radiation intensity in oppositely- magnetized domains with experimental results is good, which made it possible to attack problems of visualization of magnetic entities with nanoscale resolution. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/31972