Оксидні матеріали електронної техніки – отримання, властивості, застосування.
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Item Luminescent and Structural Studies of Y3Al5O12 Nanopowders Doped with Different Concentrations of Yb3+ Ions(2017-05-29) Syvorotka, I. I.; Luchechko, A. P.; Sugak, D. Yu.; Vasylechko, L. O.; Zhydachevskii, Ya. A.; Ubizskii, S. B.; Suchocki, A.; Scientific Research Company “Carat”, Lviv, Ukraine; Ivan Franko National University of Lviv, Ukraine; Lviv Polytechnic National University, Ukraine; Institute of Physics, Polish Academy of Science, Warsaw, Poland; Institute of Physics, Kazimierz Wielki University, Bydgoszcz, PolandItem 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 The Effect of Growing Conditions and Thermal Treatment on Luminescent Properties of CaWO4 Crystals(2017-05-29) Zakharko, Ya. M.; Solskii, I. M.; Luchechko, A. P.; Sugak, D. Yu.; Ivan Franko National University of Lviv, Ukraine; Scientific Research Company “Carat”, Lviv, Ukraine; Lviv Polytechnic National University, UkraineItem Optical Properties of GGG Epitaxial Films Grown from PbO-B2O3-V2O5 Flux(2017-05-29) Syvorotka, I. I.; Sugak, D. Yu.; Luchechko, A. P.; Zhydachevskii, Ya. A.; Ubizskii, S. B.; Scientific Research Company “Carat”, Lviv, Ukraine; Lviv Polytechnic National University, Lviv, Ukraine; Ivan Franko National University of Lviv, Lviv, Ukraine; Institute of Physics, Polish Academy of Sciences, Warsaw, PolandItem Temporal and Spatial Characteristics of the Diffusion Processes in LiNbO3 Crystals Caused by Thermo-Chemical Treatment(2017-05-29) Sugak, D. Yu.; Buryy, O. A.; Syvorotka, I. I.; Yakhnevych, U. V.; Becker, K.-D.; Ubizskii, S. B.; Semiconductor electronics department, Lviv Polytechnic National University, Lviv, Ukraine; Scientific Research Company “Carat”, Lviv, Ukraine; Technical University Braunschweig, Braunschweig, GermanyItem Peculiarities of the GGG:Nd-Microlaser performance under various pulse pumping conditions(Видавництво Львівської політехніки, 2012) Sugak, D. Yu.; Kopko, B. M.; Haiduchok, V. G.; Syvorotka, I. I.; Solskii, I. M.; Luchechko, A. P.; Vakiv, M. M.; Buryy, O. A.Domestic optical materials have been used to manufacture a Gd3Ga5O12:Nd-microlaser having a generation wavelength of 1062.4 nm, and its generation properties have been investigated under various conditions of pulse-periodic pumping by a laser diode.Item Optical properties of V2O5 crystals(Видавництво Львівської політехніки, 2012) Shevchuk, V. N.; Luchechko, A. P.; Usatenko, Yu. N.; Kayun, I. V.; Sugak, D. Yu.The multi-band luminescence and the excitation spectra, and the spectral reflectance of the undoped V2O5 in nano- and bulk-crystalline form at room temperature in the spectral range 200-900 nm were investigated. The nature of luminescence (peaked about 650 nm) is discussed with account of reflectance spectra and Electron Paramagnetic Resonance (EPR) investigations.Item High temperature structure and properties of lithium niobate(Національний університет "Львівська політехніка", 2012) Boysen, H.; Senyshyn, A.; Sugak, D. Yu.High temperature neutron powder diffraction experiments were carried for a thorough detailed study of the structural evolution and phase transition of lithium niobate. Already at low temperatures part of the Li ions enter the hitherto assumed empty octahedra, their amount increasing with temperature. This explains anomalies in the thermal expansion. The phase transition from the ferroelectric to the paraelectric phase proceeds in two steps, complete disordering of Li before Nb reaches its centrosymmetric site within its octahedron. Li is further disordered within the oxygen plane pointing towards relatively strong Li-O bonds. These results settle a number of controversies found in the literature and add new aspects.Item 93Nb NMR investigation and computer simulation of the Mg Ion localization in LiNbO3(Видавництво Львівської політехніки, 2012) Yevdokimov, S. V.; Yatsenko, A. V.; Sugak, D. Yu.; Solskii, I. M.The angular dependences of the linewidth of the 93Nb NMR spectrum central transition is experimentally investigated for the LiNbO3 crystal with congruent composition and for the samples with two various Mg concentrations. Due to the computer simulation of the NMR spectra according some scenario of Mg incorporation in the LNbO3 structure, it has been concluded that the defect complexes ( Li 2 MgL+i + V ) with the Li vacancies are realized when the Mg concentration is less then threshold.Item The peculiarities of the electrical conductivity of LiNbO3 crystals, reduced in hydrogen(Видавництво Львівської політехніки, 2012) Yatsenko, A. V.; Pritulenko, A. S.; Sugak, D. Yu.; Solskii, I. M.; Yevdokimov, S. V.The temperature dependence of the dark electrical conductivity of the “black” LN crystal in the temperature range (293 – 400) K is studied. It is found that the activation energy of the electrical conductivity is equal to (0.68 ± 0.02) eV and differ this value of LN samples, reduced in vacuum. It is shown, that the electrical conductivity of the “black” LN sample at the room temperature sufficiently decrease after the some cyclesof its heating up to 430 K. The nature of this phenomenon is discussed.