Факультет електроніки та інформаційних технологій (ЕлІТ)
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Item Structural and mechanical characterization of (TiZrNbHfTa)N/WN multilayered nitride coatings(Elsevier, 2018) Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Pshyk, A.V.; Coy, L.E.; Kempinski, M.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Beresnev, V.M.; Jurga, S.The (TiZrNbHfTa)N/WN multicomponent coatings were deposited by vacuum arc evaporation under dif- ferent substrate bias (-90 and -280 V).X-ray photoelectron spectroscopy was used for analyzing of com- plex composition of investigated coatings by reflecting of atomic scale chemical interactions. The structural investigations showed the formation of a simple disordered solid solution in (TiZrNbHfTa)N layer, b-W2N phase in WN layer with fcc crystal structure and highly disordered bcc (110) and (220) -oriented high-entropy alloy phases, regardless of the applied bias potential. It was shown that with increasing of substrate bias from -90 to -280 V, there is a slight decrease of hardness from 34 to 31 GPa and increase of Young’s modulus from 325 to 337 GPa, which can be explained by annihilation of point defects and precipitation of relatively softer metallic phase.Item A new type of (TiZrNbTaHf)N/MoN nanocomposite coating: Microstructure and properties depending on energy of incident ions(Elsevier, 2018) Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Pshyk, A.V.; Coy, L.E.; Konarski, P; Misnik, M; Ivashchenko, V.I.; Kempinski, M; Mediukh, N.R.; Beresnev, V.M.; Jurga, S; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr DmytrovychA novel (TiZrNbTaHf)N/MoN nanocomposite coatings, which consist of the nitride of the high-entropy alloy and the binary nitride, were synthesized by vacuum-arc deposition at various substrate biases. The elemental composition, chemical bonding state, phase structure, microstructure and mechanical properties of the coatings were studied by high-resolution experimental methods: SIMS, GDMS, XPS, XRD, HR-TEM and nano-indentation.It was found that the chemical state of the (TiZrNbTaHf)N/MoN coatings has a complex nature, which consist of a mixture of nitrides of constituting elements. It was also shown that the coatings are based on B1 NaCl-structured γ-Mo2N-phase with a mixture of crystallographic orientations (111), (200), (220) and (311) together with the B1NaCl-structured (TiZrNbTaHf)N solid-solution phase. First-principles calculations demonstrated that the metal sub-lattice of the (TiZrNbTaHf)N solid solution can be based on Ti1-xHfyTa1-x-y, Zr1-xHfyTa1-x-y, Zr0.25Ti0.25Ta0.5 ternary alloys, which have the lowest mixing energy. The HR-TEM results showed that the nanocomposite nitride coatings have nano-scale multilayer structure with modulation periods ranged from 20nm to 25nm. The maximum hardness of approximately 29GPa demonstrated the coating deposited at a higher energy condition (−200V) with the thinnest modulation period of bilayer of 20nm (15nm of (TiZrNbTaHf)N and 5nm of Mo2N).Item Electrophysical Properties of Granular Film Alloys Based on Fe and Ag or Au(Sumy State University, 2015) Шабельник, Юрій Михайлович; Шабельник, Юрий Михайлович; Shabelnyk, Yurii Mykhailovych; Чешко, Ірина Володимирівна; Чешко, Ирина Владимировна; Cheshko, Iryna Volodymyrivna; Пазуха, Ірина Михайлівна; Пазуха, Ирина Михайловна; Pazukha, Iryna Mykhailivna; Проценко, Іван Юхимович; Проценко, Иван Ефимович; Protsenko, Ivan YukhymovychThe experimental results of electrophysical properties of granular film alloys based on Fe and Ag or Au are presented. It is established that the value of the temperature coefficient of resistance depends on the total thickness of the samples and the concentration of magnetic component. The components concentration in the system is shown to affect the formation of the solid solution and the granular film alloy. The optimal concentration value of Fe, in which the thermally stable solid solution forms, is 45 at. %.Item Тemperature and Concentration Dependences of Anisotropic Magnetoresistance Film Materials(Sumy State University, 2015) Проценко, Сергій Іванович; Проценко, Сергей Иванович; Protsenko, Serhii Ivanovych; Гричановська, Оксана Анатоліївна; Гричановская, Оксана Анатольевна; Hrychanovska, Oksana Anatoliivna; Однодворець, Лариса Валентинівна; Однодворец, Лариса Валентиновна; Odnodvorets, Larysa Valentynivna; Проценко, Іван Юхимович; Проценко, Иван Ефимович; Protsenko, Ivan Yukhymovych; Shumakova, M.O.In framework the phenomenological approach the question of the temperature dependence of anisotropic magnetoresistance (AMR) at the fixed value inducing an external magnetic field (B) and the concentration dependence of AMR at the fixed B and T were analyzes. The obtained ratio to assess and predict the magnitude of thermal and concentration coefficients of AMR, virtually can not be done in the classical model, since it allows complex ratio with many uncertain parameters.Item Phenomenological Theory of Strain Effect in Granular Film Alloys(Sumy State University, 2014) Однодворець, Лариса Валентинівна; Однодворец, Лариса Валентиновна; Odnodvorets, Larysa Valentynivna; Shumakova, M.O.; Проценко, Іван Юхимович; Проценко, Иван Ефимович; Protsenko, Ivan Yukhymovych; Шабельник, Юрій Михайлович; Шабельник, Юрий Михайлович; Shabelnyk, Yurii Mykhailovych; Шумакова, Наталія Іванівна; Шумакова, Наталия Ивановна; Shumakova, Nataliia IvanivnaThe elementary theory tensoresistive effect in granular thin film materials was proposed. Analyzed limiting cases of large, small and normal concentration of magnetic granules. It is concluded that in all three cases, the strain coefficient is defined tensoresistive properties of the matrix solid solution film samples as granules sold ballistic electrocarry charge.Item Influence of Magnetic Field on Thermal Coefficient of Resistance of the Granular Film Alloys(Sumy State University, 2014) Однодворець, Лариса Валентинівна; Однодворец, Лариса Валентиновна; Odnodvorets, Larysa ValentynivnaThe elementary theory about the effects of external magnetic field on the value of the thermal coefficient of resistance (B) granular alloy film was proposed. The obtained value allows calculating the difference between the value B for the sample and solid solution, which based on the granular alloy was formed.Item Тhermoresistive Properties of Film Systems with Elements of Granular State(Sumy State University, 2014) Hrychanovs’ka, O.A.; Karpenko, K.H.; Однодворець, Лариса Валентинівна; Однодворец, Лариса Валентиновна; Odnodvorets, Larysa Valentynivna; Проценко, Сергій Іванович; Проценко, Сергей Иванович; Protsenko, Serhii Ivanovych; Panchal, C.J.; Kher, V.H.; Mehta, P.K.; Poduremne, D.V.; Protsenko, I.Yu.The question about the conditions of formation granular solid solutions (systems based on components with limited or unlimited solubility) or peculiar quasigranular films (systems with mutual solubility of the components and the formation of intermetallic phases in the bulk samples). On example of the first film (Ag/Fe/S) and second (Fe/Pt/Fe/S, [Fe/Pt]8 /S) films types the temperature and concentration dependences of the resistance and thermal coefficient of resistance (TCR) were studies. It is concluded that the value of TCR will always depend on the composition (type of crystal lattices) termostabilize film material, rather than on the efficiency of electron scattering in granules or quasigranular because they will most likely realized ballistic charge transport mechanism.Item Simulation of the Mechanism of Formation of Solid Solutions in the System In2О3 – ТіO2 When Heated in Air(Sumy State University, 2013) Solovyova, A.E.On the basis of mathematical models of the formation of solid solutions in the In2O3 – ТіО2 calculated ionic radius of the cations: indium, titanium, anion and anionic vacancies on the scale of Templeton and Deben. A phase transformation in the oxide of indium was related with disorder of anionic vacancies in the lattice type C. The formation of solid solutions in this system proceeds on the basis of the disordered phase of type С1. The system formed limited solid solutions such as: subtraction – substitution – inculcation of a range of concentrations (0 – 2% ТіО2), subtraction – substitution of concentrations (0.5 – 2% іО2), higher concentrations of these compounds present in the mixture of In2TiO5-х – rhombic modification, which is formed during sintering the samples at 1100 ·C in air. The type solid solution systems in the In2O3 – ТіО2, depend on the size of cation bases and additives. The energies of formation: solid solution subtraction – substitution – introduction, solid solution subtraction – substitution were determined and shows that the conductivity of the current, concentration and mobility of the charge carriers depends on the type of the solid solution and not on the valence of the dissolved additive. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/35393Item Effect of the Preparation Method on the Structural and Catalytic Properties of MnOx-CeO2 Manganese Cerium Mixed Oxides(Sumy State University, 2013) Benadda, Amel; Djadoun, Amar; Guessis, Hafida; Barama, AkilaMnOx-CeO2 catalysts (molar ratio Mn/Ce 1) were prepared using two methods: co-precipitation and citrate methods. The prepared solids were calcined at 500°C, and characterized by XRD, nitrogen adsorp-tion-desorption technique and SEM morphological, they were, then, tested in the toluene combustion reac-tion. The catalytic performances of the prepared solids were evaluated in the temperature range 150-400°C. The XRD analysis of the two solids showed that the only crystalline phase detected is cerium oxide. BET surface area measurements showed that the incorporation of manganese led to an increase in the spe-cific surface area of ceria, the solid prepared by the co-precipitation method led to the highest specific sur-face area (156 m²/g). The solids showed good performances in the toluene combustion reaction that depend strongly on the preparation method. The best catalytic activity was obtained for the catalyst prepared by the citrate method achieving a complete conversion of toluene at 250 ° C. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35257Item Characterization and Formation Mechanism of Solid Solution in Nanocrystalline Al-5wt%Si Powders Produced by Mechanical Alloying(Sumy State University, 2012) Dayani, D.; Shokuhfar, A.; Vaezi, M.R.; Zolriasatein, A.Due to advantages of mechanical alloying in comparison with liquid state processes, this process has used a lot to synthesis nanostructured alloy. In the present study, aluminum and silicon elemental powders with composition Al-5wt % Si were synthesized by mechanical alloying in high energy planetary ball. X-ray diffractometer and scanning electron microscopic were used to study microstructural and morphological changes of powder particles and formation of solid solution of Al-Si during milling. Crystallite size, lattice strain and lattice parameter were determined by Scherer, Williamson–Hall and Nilson–Reley methods. Minimum crystallite size was 17.895 nm according to Scherer method and 32.644 nm according to Williamson-Hall. Solid solution of Al-Si was formed between 5 h and 30 h, due to crystallite size in nano scale and diffusion process in mechanical alloying. In addition lattice parameter changes and XRD results prove it. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35031