Оксидні матеріали електронної техніки – отримання, властивості, застосування.
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Item Synthesis and Structure Characterisation of Micro- and Nanocrystalline Powders of Dy1-xRxFeO3 (R = La, Pr, Nd, Sm, Gd)(2017-05-29) Pavlovska, O.; Lutsyuk, I.; Vachula, Ya.; Vasylechko, L.; Lviv Polytechnic National University, 12 Bandera Street, 79013 Lviv, UkraineItem Thermal Behaviour of PrCo1–xFexO3 Probed by X-Ray Synchrotron Powder Diffraction and Impedance Spectroscopy Measurements(2017-05-29) Pekinchak, O.; Sugak, D. Yu.; Ubizskii, S. B.; Suhak, Yu.; Fritze, H.; Vasylechko, L.; Lviv Polytechnic National University, Lviv, Ukraine; Institute of Energy Research and Physical Technologies, Clausthal University of Technology, Goslar, GermanyItem Anomalous Thermal Expansion of NdCo1–xGaxO3(2017-05-29) Hreb, V.; Mykhalichko, V.; Vasylechko, L.; Zaharko, O.; Chernyshov, D.; Lviv Polytechnic National University, Lviv, Ukraine; Paul Scherrer Institut, Villigen, Switzerland; Swiss-Norwegian Beamlines at the ESRF, CS40220 38043 Grenoble Cedex 9, FranceItem Concentration and temperature-driven phase transitions in the NdAlO3-EuAlO3 system(Видавництво Львівської політехніки, 2012) Ohon, N.; Pashuk, A.; Hoffmann, S.; Vasylechko, L.Phase and structural behaviour in the NdAlO3– EuAlO3 system has been studied in a whole concentration range. Depending on x two kinds of solid solutions Nd1-xEuxAlO3 one with rhombohedral (x £ 0.15) and one with orthorhombic (x ³ 0.25) symmetry exist at room temperature. A morphotropic phase transition occurs at x ≈ 0.20, where the co-existence of both phases was observed. First-order structural phase transition Pbnm↔R 3 c has been detected in Nd0.6Eu0.4AlO3 at 627 K both from in situ high-temperature X-ray synchrotron powder diffraction and thermal analysis data.Item Phase composition and crystal structure of the RE-substituted BiFeO3 (RE = Er, Tm, Yb)(Видавництво Львівської політехніки, 2012) Kuz, O.; Handysh, V.; Prots, Yu.; Vasylechko, L.The work deals with the study of the phase and structural behaviour of the rare-earth substituted BiFeO3. Xray powder diffraction examinations revealed that the polar R3c phase in the Bi1-xRExFeO3 systems with RE = Er, Tm and Yb do not exceed 7, 4 and 3 mol.% of rare earth, respectively. Partial substitution of Er and Tm for the Bi sites in BiFeO3 reduce the temperature of the ferroelectric phase transition R3c-Pbnm on 30-60 K.Item Concentration and temperature-driven phase transitions in the NdAlO3-EuAlO3 system(Видавництво Львівської політехніки, 2012) Ohon, N.; Pashuk, A.; Hoffmann, S.; Vasylechko, L.Phase and structural behaviour in the NdAlO3– EuAlO3 system has been studied in a whole concentration range. Depending on x two kinds of solid solutions Nd1-xEuxAlO3 one with rhombohedral (x £ 0.15) and one with orthorhombic (x ³ 0.25) symmetry exist at room temperature. A morphotropic phase transition occurs at x ≈ 0.20, where the co-existence of both phases was observed. First-order structural phase transition Pbnm↔R 3 c has been detected in Nd0.6Eu0.4AlO3 at 627 K both from in situ high-temperature X-ray synchrotron powder diffraction and thermal analysis data.Item Crystal and twin structure of LSGMn-05 anode material for SOFC(Видавництво Львівської політехніки, 2012) Tataryn, T.; Vasylechko, L.; Savytskii, D.; Berkowski, M.; Paulmann, C.; Bismayer, U.The structure of perovskite-type La0.95Sr0.05Ga0.95Mn0.05O3-x crystals has been investigated using high-resolution X-ray powder diffraction technique in the temperature range of 298–1173 К. A phase transition from orthorhombic (Pbnm) to rhombohedral (R 3 c) has been detected near 340 К. A chevron-like configuration of ferroelastic domain structure was observed in rhombohedral La0.95Sr0.05Ga0.95Mn0.05O3-x crystal using the Laue technique. The chevron-like pattern is formed by the intersection of Wtype domain walls (211), (101) and (110).Item Crystal structure, oxygen nonstoichiometry and diffusion mobility in some ferrites-nickelites(Видавництво Львівської політехніки, 2012) Vashook, V.; Rebello, J.; Chen, J.-Y.; Vasylechko, L.; Trots, D.; Zosel, J.; Guth, U.Crystal structure, thermal expansion, oxygen non-stoichiometry, electrical conductivity and diffusion characteristics of two analogous LaFe0.7Ni0.3O3-d and PrFe0.7Ni0.3O3-d compositions were investigated depending on temperature (20-1000 °C) and oxygen partial pressure (0.6-21000 Pa). The found oxygen diffusion and oxygen exchange coefficients for the both compositions at similar conditions are near to each other and varied in the range of 1·10-7-1·10-5 cm2·s-1 and 5·10-6-1·10-4 cm·s-1, respectively.Item Influence of cation substitution on spin-state transitions in mixed RE cobaltites and chromites(Видавництво Львівської політехніки, 2012) Vasylechko, L.; Bell, A. M. T.Phase and structural behaviour of new mixed cobaltites R1-xR’xCoO3 (R, R’ = La, Pr, Nd, Sm, Eu, Gd) and cobaltites-chromites RCo0.5Cr0.5O3 (R = Pr, Sm, Eu, Gd) has been studied in the temperature range of 298–1173K. Strong anomalies in the lattice expansion reflecting the changes in spin state of Co3+ ions, are found. Correlations between the structural parameters, characteristic temperatures of thermal expansion coefficients and the temperatures of spinstate transitions in the mixed RE cobaltites has been established.Item Interaction of components in PrAlO3- AND LaAlO3-based systems(Видавництво національного університету „Львівська політехніка”, 2009) Basyuk, T.; Vasylechko, L.; Fadeev, S.; Berezovets, V.; Trots, D.; Niewa, R.