http://repository.enu.kz/handle/enu/10655 Sat, 04 Apr 2026 05:39:40 GMT 2026-04-04T05:39:40Z http://repository.enu.kz/handle/enu/10678 Study of the effect of irradiation on nitride ceramic materials Gladkikh, T.M.; Kozlovskiy, A.L.; Zdorovets, M.V.; Kaniukov, E.Y. The paper presents the results of a study of the effect of proton and ion radiation on structural changes in nitride ceramics, which have a high potential for using as a structural material for GenIV nuclear reactors. Proton beams with an energy of 1.5 MeV and low-energy helium (He 2+ ) and carbon (C 2+ ) ions with an energy of 40 keV were used, to simulate defect formation and to estimate ceramics radiation resistance. According to the data obtained, it has been established that AlN nitride ceramics have high radiation resistance to the effects of proton radiation. While under irradiation with C 2+ ions, the observed degradation of the surface layer is due to the accumulation of carbon in the structure with the subsequent formation of impurity carbide inclusions. It is established that the accumulation of slightly soluble ions of helium and carbon in the structure of the surface layer leads to an increase in the strain and distortion of crystal lattice due to introducing ions into the interstitial lattice and breaking chemical and crystalline bonds. Tue, 01 Jan 2019 00:00:00 GMT http://repository.enu.kz/handle/enu/10678 2019-01-01T00:00:00Z http://repository.enu.kz/handle/enu/10676 Current status of the new fragment separator ACCULINNA-2 and the first-day experiments Gorshkov, A.V.; Belogurov, S.G.; Bezbakh, A.A.; Biare, D.; Beekman, W.; Chudoba, V.; Fomichev, A.S.; Golovkov, M.S.; Gazeeva, E.M.; Grigorenko, L.V.; Kaminski, G.; Krupko, S.A.; Mauyey, B.; Muzalevsky, I.A.; Nikolskii, E.Yu.; Parfenova, Yu.L.; Serikov, A.; Sidorchuk, S.I.; Slepnev, R.S.; Sharov, P.G.; Ter-Akopian, G.M.; Wolski, R.; Zalewski, B. The commissioning of the new fragment separator ACCULINNA-2 at FLNR JINR is accomplished. The separator is destined to expand the possibilities in studies of dripline nuclei performed with the exotic secondary radioactive ion beams (RIBs) at energies of (5 – 50) AMeV. The projected high transmission and purification level were confirmed experimentally for a number of RIBs in the last two years. The ACCULINNA-2 setup will become a backbone facility at FLNR for the research in the field of light exotic nuclei. This report shows the current status of the separator, describes the obtained RIBs parameters and first experiments as well, provides the overview of the developing detection, monitoring and control subsystems. Tue, 01 Jan 2019 00:00:00 GMT http://repository.enu.kz/handle/enu/10676 2019-01-01T00:00:00Z http://repository.enu.kz/handle/enu/10668 DFT calculation of optical properties of new neutral hexacoordinated Si(bzimpy)2 complexes Bimukhanov, A.N.; Aldongarov, A.A.; Schmedake, T.A. We consider optical properties of 4 neutral hexacoordinated Si(bzimpy) 2 complexes, containing the 2,6- bis(benzimidazol-2 ′ -yl) pyridine ligand using DFT method. The geometrical parameters of the optimized cluster structures, the electronic absorption spectrum, and the molecular orbitals of the structures under consideration are discussed. The effect of addition of the substituents ligands to the of Si(bzimpy) 2 compound is considered. We found that succesive addition of substituents shifts HOMO and LUMO to higher values. The manipulation may provide desirable optical properties of the material. Tue, 01 Jan 2019 00:00:00 GMT http://repository.enu.kz/handle/enu/10668 2019-01-01T00:00:00Z http://repository.enu.kz/handle/enu/10665 The effect of irradiation with swift heavy ions on the structural and morphological properties of beryllium oxide ceramics Kozlovskiy, A.L.; Ryskulov, A.E.; Uglov, V.V.; Kislitsin, S.B. In this study the results of structural and morphological changes in Ni 12+ heavy ion irradiated BeO ceramics are presented. Irradiation was carried out on DC-60 heavy ion accelerator using Ni 12+ ions with an energy of 100 MeV with irradiation fluence of 10 13 -10 14 ions/cm 2 . It has been determined that change in magnitude of atom displacements from lattice sites is exponential, which is conditioned by defect overlap regions occurrence at fluence of 10 14 ions/cm 2 , followed by formation of a large number of migrating defects in structure, leading to crystal structure distortion and deformation due to chemical bonds rupture. In case of defect overlap areas generation, characteristic for irradiation fluences of 5 × 10 13 - 10 14 ions/cm 2, amorphous inclusions formation of more than 5% was observed, that leads to thermal conductivity decrease by (15-20)%. Tue, 01 Jan 2019 00:00:00 GMT http://repository.enu.kz/handle/enu/10665 2019-01-01T00:00:00Z