http://dspace.nbuv.gov.ua:80/handle/123456789/132725 Mon, 13 Apr 2026 02:26:56 GMT 2026-04-13T02:26:56Z http://dspace.nbuv.gov.ua:80/bitstream/id/394703/ http://dspace.nbuv.gov.ua:80/handle/123456789/132725 http://dspace.nbuv.gov.ua:80/handle/123456789/135308 Optical absorption and diffusion of iron in ZnS single crystals Nitsuk, Yu.A.; Vaksman, Yu.F.; Yatsun, V.V.; Purtov, Yu.N. ZnS:Fe single crystals obtained by diffusion doping were investigated. Spectra of optical density in the range of energies 0.4—3.8 eV were obtained. The concentration of iron in the studied crystals was determined using a magnitude of the shift of the absorption edge. Optical transitions determining the impurity absorption spectrum of ZnS:Fe single crystals were identified. The diffusion profile of Fe impurity was determined by measuring the relative optical density of the crystals in the visible spectral region. The diffusivities of Fe in ZnS crystals in the temperature range of 1220—1320 K were calculated for the first time. At 1270 K the diffusivity of Fe is 2⁻¹⁰ cm²/s. Sun, 01 Jan 2012 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/135308 2012-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/135307 Synthesis and luminescent properties of CaF₂:Eu²⁺ nanocrystals Zhmurin, P.N.; Sythik, O.Yu.; Svidlo, O.V.; Lebedev, V.N.; Adadurov, A.F. The synthesis of CaF₂ nanocryatals activated by Eu²⁺ ions and soluble in nonpolar media is described, their luminescent properties are studied. It is shown that in nanocrystals of this type there are some channels of radiationless energy loss. These losses significantly decrease the quantum yield of luminescence of CaF₂ nanocryatals. Sun, 01 Jan 2012 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/135307 2012-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/135306 First-principles calculations atomic structure and elastic properties of Ti-Nb alloys Timoshevskii, A.N.; Yablonovskii, S.O.; Ivasishin, O.M. Elastic properties of Ti based (3-alloy were studied by the method of the model structure first principle calculations. Concentrational dependence of Young modulus for the binary (3-alloy Ti₁₋ₓNbₓ was discovered. It is shown that peculiarities visible at 0.15 - 0.18 a.u. concentrations can be related to the different Nb atoms distribution. Detailed comparison of the calculation results with the measurement results was done. Youngs modulus for the set of the ordered structures with different Nb atoms location, which simulate triple β-alloys Ti₀.₅₁₈Zr₀.₂₉₇Nb₀.₁₈₅ and Ti₀.₂₉₇Zr₀.₅₁₈Nb₀.₁₈₅ have been calculated. The results of these calculations allowed us to suggest the concentration region for single-phase ternary β-phase alloys possessing low values of Young’s modulus. Sun, 01 Jan 2012 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/135306 2012-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/135305 Electrodeposited zinc oxide nanostructures with adsorbed natural dyes for photovoltaic applications Klochko, N.P.; Khrypunov, G.S.; Myagchenko, Y.O.; Melnychuk, E.E.; Kopach, V.R.; Klepikova, K.S.; Lyubov, V.M.; Kopach, A.V. We report on a cost-effective alternative synthetic method for creation of ZnO-based natural-dye sensitized solar cells (DSSC). ZnO arrays were electrodeposited on transparent fluorine doped tin oxide covered glass cathodes in aqueous electrolytes in three-electrode cell under potentiostatic conditions and under pulse plating modes with rectangular impulses of cathode potential. Then ZnO layers were dye-sensitized by a freshly prepared blackcurrant juice. The studies of structure by XRD-method, surface morphology by atomic force microscopy and optical properties by spectrophotometry have demonstrated the promise of ZnO arrays electrochemically grown in the rectangular pulse mode for creation of natural-dye sensitized DSSC. Sun, 01 Jan 2012 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/135305 2012-01-01T00:00:00Z