http://dspace.nbuv.gov.ua:80/handle/123456789/114725 2026-04-25T06:22:51Z http://dspace.nbuv.gov.ua:80/handle/123456789/120498 Energy transfer in co-doped NaI:(Tl,Eu) crystals Gridin, S.; Vasyukov, S.; Shiran, N.; Gektin, A. The energy transfer mechanism in Eu doped and Tl, Eu co-doped NaI crystals is discussed. The self-trapped exciton emission band overlaps stronger with Eu²⁺ excitation bands rather that with Tl⁺. This suggests that transfer STE -> Activator can be more efficient in Eu²⁺ co-doped NaI:Tl crystals. Theoretical estimation of energy transfer efficiency was done based on the Forster model. It is shown that Europium concentration of 1 mass% or above is required for efficient dipole-dipole energy transfer. However, this concentration is not reachable in NaI:(Tl,Eu) due to the solubility limit of Eu²⁺ in NaI crystal. 2014-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/120497 Characterization and photocatalytic activity of Ti/TinOm •ZrxOy coatings for azo-dye degradation Sakhnenko, N.D.; Ved, M.V.; Bykanova, V.V. Anodic oxidation of VT1-0 titanium and E-125 zirconium alloy in aqueous electrolyte solutions based on H₂SO₄ and K₄P₂O₇ was used to obtain oxide coatings composed of Zr/ZrO₂, Ti/TiO₂, and mixed oxide systems Ti/TinOm•ZrxOy. It was shown that, depending on the electrolyte pH, the films contain up 0.17 to 2.1 % wt. of zirconium. Catalytic activity of the synthesized coatings in the oxidation reaction of methyl orange azo dye under UV irradiation was established. The process rate constants and synergy factors for the mixed systems were calculated. 2014-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/120496 Effect of microwave sintering temperature on structure and properties of bioceramics based on biogenic hydroxyapatite Tovstonoh, H.; Sych, O.; Skorokhod, V. The present work demonstrates the possibility to produce medicine-aimed ceramics on the basis of biogenic hydroxyapatite with structural-mechanical properties required for replacement of the bone tissue defects using techniques of microwave sintering at 800-1100°C. It has been established that porosity of the bioceramics obtained in the temperature range of 800-1000°C (5 min exposure to the maximal temperature) equals about 40 %, whereas at 1100°C it decreases down to 37 %. Compression strength increases with increasing the temperature from 25 to 38 MPa. 2014-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/120495 Obtaining of hydration parameters of cesium halides in the processes of water absorption and desorption Vashchenko, O.V. Cesium halides were examined in water absorption/desorption processes. A methodology was proposed to obtain hydration parameters of the substances examined. It was established that amount of water in near hydration shell as well as water desorption enthalpy increase in order CsCl-CsBr-CsI. Magnitudes of near hydration shell were established by means of thermogravimetry as 41, 86 and 99 water molecules, correspondingly. 2014-01-01T00:00:00Z