Search academic texts

Information × Registration Number 0225U002679, (0122U002635) , R & D reports Title Development of REE-activated halide scintillation materials based on matrices containing ions that are limited isomorphic to the activator. popup.stage_title Розробка РЗЕ-активованих галогенідних сцинтиляційних матеріалів на основі матриць, що містять іони, обмежено ізоморфні до активатора. Head Cherginets Viktor L., Доктор хімічних наук Registration Date 27-03-2025 Organization Institute for scintillation materials NAS Ukraine popup.description1 Development of methods for synthesis and pre-growth treatment of charge in reactive gaseous medium and optimization of modes of growing REE-activated scintillation materials based on REE-activated halides of metals of I and II groups of the Periodic Table of Elements with limited isomorphic components for detecting ionizing radiation. popup.description2 Solvent methods for obtaining and dehydrating the charge for growing single crystals based on solid solutions of alkali metal halides and alkaline earth metal halides and zinc activated by Eu2+ have been developed. The processes of processing halide melts in a reactive gas environment have been investigated. The potentiometric study of the interaction between oxide ion donors and cations that form the basis of the CsBr+LiBr and (2CsBr-LiBr)+YBr3 melts, respectively, at a temperature of 973 K has been carried out. The process of removing O2- impurities from the KBr-2 SrBr2 melt at a temperature of 973 K was studied by the EMF method. The chemical stage of the deoxidization process is described by the second-order kinetic equation with respect to O2-. The processes of dissolving Eu2O3 in the KBr-2SrBr2 melt at 973 K showed that carbohalogenation (treatment of the melt with redox vapor ‘C+Br2’) provided not only the dissolution of the oxide, but also the complete reduction of Eu3+ to Eu2+. The dissolution of Eu2O3 is completed within 40 min, and the complete deoxidization process takes 90 min. The luminescent and scintillation properties of Cs3ZnCl5 single crystals grown from melts of the compositions 3CsCl-ZnCl2 and 3CsCl-0.995ZnCl2-0.005 EuCl2 were investigated. Studies of the light output of the obtained crystals showed that both types of crystals have a light output of approximately 6% relative to BGO (Bi4Ge3O12) crystals, and the shape of their amplitude spectra is almost the same, which indicates a slight transfer of excitation from the matrix to Eu2+ ions. The functional parameters of CsMgCl3 and CsMgCl3:xEu2+ crystals (x=0.5, 1 and 1.5 mol. %, in the charge) were investigated. The coefficient of Eu2+ incorporation into the CsMgCl3 matrix is 0.021. Europium is incorporated into the crystal in the forms of Eu2+ (major) and Eu3+ (traces). Product Description popup.authors Aleksieiev Vadym D. Ponomarenko Tamara V. Rebrov Oleksandr L. Rebrova Tetiana P. Cherhynets Viktor L. popup.nrat_date 2025-03-27 Close